10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2018

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from  to

Commission file number 000-30713

Intuitive Surgical, Inc.

(Exact name of Registrant as specified in its Charter)

Delaware	77-0416458
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

1020 Kifer Road

Sunnyvale, California 94086

(Address of principal executive offices) (Zip Code)

(408) 523-2100

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    YES  x    NO  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    YES  x    NO  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See definition of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	x		Accelerated filer	¨
Non-accelerated filer	¨	(Do not check if a smaller reporting company)	Smaller reporting company	¨
			Emerging growth company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    YES  ¨    NO  x

The Registrant had 113,747,594 shares of Common Stock, $0.001 par value per share, outstanding as of July 17, 2018.

INTUITIVE SURGICAL, INC.

TABLE OF CONTENTS

		Page No.
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements (unaudited):
	Condensed consolidated balance sheets as of June 30, 2018 and December 31, 2017	3
	Condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2018 and 2017	4
	Condensed consolidated statements of cash flows for the six months ended June 30, 2018 and 2017	5
	Notes to condensed consolidated financial statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	21
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	37
Item 4.	Controls and Procedures	37
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	38
Item 1A.	Risk Factors	38
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	38
Item 3.	Defaults Upon Senior Securities	38
Item 4.	Mine Safety Disclosures	38
Item 5.	Other Information	38
Item 6.	Exhibits	39
	Signature	40

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PART I - FINANCIAL INFORMATION

ITEM  1. FINANCIAL STATEMENTS

INTUITIVE SURGICAL, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

in millions (except par values)	June 30, 2018			December 31, 2017
ASSETS
Current assets:
Cash and cash equivalents	$	1,203.5		$	648.2
Short-term investments	1,729.0			1,312.4
Accounts receivable, net	532.5			507.9
Inventory	331.5			241.2
Prepaids and other current assets	189.6			99.2
Total current assets	3,986.1			2,808.9
Property, plant, and equipment, net	688.8			613.1
Long-term investments	1,327.1			1,885.9
Deferred tax assets	415.4			72.0
Intangible and other assets, net	221.3			195.8
Goodwill	210.9			201.1
Total assets	$	6,849.6		$	5,776.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	102.2		$	82.5
Accrued compensation and employee benefits	128.0			167.6
Deferred revenue	272.1			243.8
Other accrued liabilities	164.1			168.9
Total current liabilities	666.4			662.8
Other long-term liabilities	314.0			333.6
Total liabilities	980.4			996.4
Contingencies (Note 6)
Stockholders’ equity:
Preferred stock, 2.5 shares authorized, $0.001 par value, issuable in series; no shares issued and outstanding as of June 30, 2018, and December 31, 2017	—			—
Common stock, 300.0 shares authorized, $0.001 par value, 113.7 shares and 112.3 shares issued and outstanding as of June 30, 2018, and December 31, 2017, respectively	0.1			0.1
Additional paid-in capital	4,928.8			4,679.2
Retained earnings	948.1			115.0
Accumulated other comprehensive loss	(16.4		)	(15.5		)
Total Intuitive Surgical, Inc. stockholders’ equity	5,860.6			4,778.8
Noncontrolling interest	8.6			1.6
Total stockholders’ equity	5,869.2			4,780.4
Total liabilities and stockholders’ equity	$	6,849.6		$	5,776.8

See accompanying Notes to Condensed Consolidated Financial Statements (Unaudited).

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INTUITIVE SURGICAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(UNAUDITED)

	Three Months Ended   June 30,					Six Months Ended   June 30,
in millions (except per share amounts)	2018			2017		2018			2017
Revenue:
Product	$	753.5		$	618.9	$	1,448.3		$	1,160.5
Service	155.8			139.9		308.5			277.9
Total revenue	909.3			758.8		1,756.8			1,438.4
Cost of revenue:
Product	228.1			184.7		429.6			350.2
Service	48.9			44.0		101.1			88.3
Total cost of revenue	277.0			228.7		530.7			438.5
Gross profit	632.3			530.1		1,226.1			999.9
Operating expenses:
Selling, general and administrative	259.8			185.6		481.4			388.5
Research and development	95.1			84.6		190.6			158.1
Total operating expenses	354.9			270.2		672.0			546.6
Income from operations	277.4			259.9		554.1			453.3
Interest and other income, net	18.2			10.1		31.4			18.8
Income before taxes	295.6			270.0		585.5			472.1
Income tax expense	41.0			47.0		43.6			68.3
Net income	254.6			223.0		541.9			403.8
Less: net loss attributable to noncontrolling interest	(0.7		)	—		(1.0		)	—
Net income attributable to Intuitive Surgical, Inc.	$	255.3		$	223.0	$	542.9		$	403.8
Net income per share attributable to Intuitive Surgical, Inc.:
Basic	$	2.25		$	2.01	$	4.80		$	3.62
Diluted	$	2.15		$	1.94	$	4.59		$	3.50
Shares used in computing net income per share attributable to Intuitive Surgical, Inc.:
Basic	113.5			111.0		113.2			111.6
Diluted	118.5			115.2		118.3			115.5
Total comprehensive income attributable to Intuitive Surgical, Inc.	$	257.0		$	221.2	$	542.0		$	402.9

See accompanying Notes to Condensed Consolidated Financial Statements (Unaudited).

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INTUITIVE SURGICAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Six Months Ended   June 30,
in millions	2018			2017
Operating activities:
Net income	$	541.9		$	403.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and loss on disposal of property, plant, and equipment	49.8			39.6
Amortization of intangible assets	5.7			7.0
Loss on investments, accretion of discounts, and amortization of premiums on investments, net	4.7			11.4
Deferred income taxes	48.7			35.5
Share-based compensation expense	120.8			97.8
Amortization of contract acquisition asset	5.3			5.5
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	(17.3		)	(51.4		)
Inventory	(133.9		)	(58.3		)
Prepaids and other assets	(102.4		)	(47.9		)
Accounts payable	14.3			5.7
Accrued compensation and employee benefits	(39.6		)	(24.9		)
Deferred revenue	29.8			40.3
Other liabilities	(16.1		)	(6.1		)
Net cash provided by operating activities	511.7			458.0
Investing activities:
Purchase of investments	(851.6		)	(707.0		)
Proceeds from sales of investments	259.0			1,474.9
Proceeds from maturities of investments	724.9			294.9
Purchase of property, plant, and equipment and intellectual property	(84.9		)	(108.3		)
Acquisition of business, net of cash	(38.1		)	—
Net cash provided by investing activities	9.3			954.5
Financing activities:
Proceeds from issuance of common stock relating to employee stock plans	134.9			296.4
Taxes paid related to net share settlement of equity awards	(108.0		)	(50.0		)
Repurchase of common stock	—			(2,000.0		)
Other financing activities	8.0			—
Net cash provided by (used in) financing activities	34.9			(1,753.6		)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(0.6		)	1.0
Net increase (decrease) in cash, cash equivalents, and restricted cash	555.3			(340.1		)
Cash, cash equivalents, and restricted cash, beginning of period	663.2			1,051.6
Cash, cash equivalents, and restricted cash, end of period	$	1,218.5		$	711.5

See accompanying Notes to Condensed Consolidated Financial Statements (Unaudited).

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INTUITIVE SURGICAL, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

In this report, “Intuitive Surgical,” “Intuitive,” the “Company,” “we,” “us,” and “our” refer to Intuitive Surgical, Inc. and its wholly- and majority-owned subsidiaries.

NOTE 1.    DESCRIPTION OF THE BUSINESS

Intuitive Surgical, Inc. designs, manufactures, and markets da Vinci^® Surgical Systems and related instruments and accessories, which taken together, the Company considers to be an advanced generation of surgery. This advanced generation of surgery, which the Company calls da Vinci Surgery, combines the benefits of minimally invasive surgery (“MIS”) for patients with the ease of use, precision, and dexterity of open surgery. A da Vinci Surgical System consists of a surgeon’s console, a patient-side cart, and a high performance vision system. The da Vinci Surgical System translates a surgeon’s natural hand movements, which are performed on instrument controls at a console, into corresponding micro-movements of instruments positioned inside the patient through small incisions, or ports. The da Vinci Surgical System is designed to provide its operating surgeons with intuitive control, range of motion, fine tissue manipulation capability, and Three Dimensional (“3-D”) High-Definition (“HD”) vision while simultaneously allowing surgeons to work through the small ports enabled by MIS procedures.

NOTE 2.    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements (“Financial Statements”) of Intuitive Surgical, Inc. and its wholly- and majority-owned subsidiaries have been prepared on a consistent basis with the audited Consolidated Financial Statements for the fiscal year ended December 31, 2017, and include all adjustments, consisting of only normal recurring adjustments, necessary to fairly state the information set forth herein. The Financial Statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) and therefore, omit certain information and footnote disclosure necessary to present the Financial Statements in accordance with accounting principles generally accepted in the United States (“U.S.”) (“U.S. GAAP”). These Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, which was filed with the SEC on February 2, 2018. The results of operations for the first six months of fiscal year 2018 are not necessarily indicative of the results to be expected for the entire fiscal year or any future periods.

The Financial Statements include the results and the balances of the Company’s majority owned joint venture with Shanghai Fosun Pharmaceutical (Group) Co., Ltd. The Company holds a controlling financial interest in the joint venture and the noncontrolling interest is reflected as a separate component of consolidated stockholders’ equity.

Recent Accounting Pronouncements Not Yet Adopted

In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases (Topic 842), which amends the existing accounting standards for leases. The new standard requires lessees to record a right-of-use asset and a corresponding lease liability on the balance sheet (with the exception of short-term leases). The new standard also requires expanded disclosures regarding leasing arrangements. The new standard becomes effective for the Company in the first quarter of fiscal year 2019 and early adoption is permitted. The new standard is required to be adopted using the modified retrospective approach and requires application of the new standard at the beginning of the earliest comparative period presented. The Company generally does not finance purchases of equipment or other capital, but does lease some of its facilities. The Company’s customers finance purchases of da Vincisystems and ancillary products, including directly with the Company. It is currently unknown whether the new standard will change customer buying patterns or behaviors. The Company is evaluating the effect that this new standard will have on its Financial Statements and related disclosures.

Adopted Accounting Pronouncement

Revenue from Contracts with Customers

The Company adopted FASB Accounting Standards Codification Topic 606 (“ASC 606”), Revenue from Contracts with Customers in the first quarter of the Company’s fiscal year that began on January 1, 2018, using the full retrospective method, which required the Company to restate each prior reporting period presented. This new standard replaced the previous revenue recognition guidance in U.S. GAAP. Please see the Company’s “Revenue Recognition” policy in the “Significant Accounting Policies” section below.

The areas impacted include future contractual billings related to services included in the Company’s multi-year contracts, which are considered performance obligations that should be part of the contract consideration allocated to all performance

6

obligations rather than being excluded due to its contingent nature as required under the previous revenue standard. Accordingly, the amount of contract consideration allocated to the performance obligations identified in the Company’s system arrangements is different from the amounts allocated under the previous revenue standard. In general, revenue is recognized earlier as a greater amount of the contract consideration is allocated to the product-related performance obligations that generally are delivered upfront, and therefore, less consideration is allocated to the service performance obligation that is generally recognized over the service period.

In addition, the Company recognized an asset associated with the incremental costs of obtaining revenue generating customer contracts that it expects to benefit from over a period longer than one year. The Company capitalized sales commissions paid in connection with system sale arrangements that include multi-year service obligations and is amortizing such asset over the economic life of those contracts. Previously, sales commissions were expensed as incurred. The impact of this change on operating expenses in any given period will depend, in part, on the amount of such commissions incurred and capitalized in relation to the amount of ongoing amortization expense.

Adoption of the standard using the full retrospective method also required the Company to restate certain previously reported results, including the impact to provision for income taxes. The adjustments to the unaudited Condensed Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2017, are as follows (in millions, except per share amounts):

	Three Months Ended June 30, 2017							Six Months Ended June 30, 2017
	As Previously Reported		Adjustments			As Restated		As Previously Reported		Adjustments			As Restated
Revenue:
Product	$	614.2	$	4.7		$	618.9	$	1,148.2	$	12.3		$	1,160.5
Service	142.0		(2.1		)	139.9		282.2		(4.3		)	277.9
Total revenue	756.2		2.6			758.8		1,430.4		8.0			1,438.4
Cost of revenue:
Product	184.3		0.4			184.7		348.1		2.1			350.2
Service	44.0		—			44.0		88.3		—			88.3
Total cost of revenue	228.3		0.4			228.7		436.4		2.1			438.5
Gross profit	527.9		2.2			530.1		994.0		5.9			999.9
Operating expenses:
Selling, general and administrative	185.8		(0.2		)	185.6		386.9		1.6			388.5
Research and development	84.6		—			84.6		158.1		—			158.1
Total operating expenses	270.4		(0.2		)	270.2		545.0		1.6			546.6
Income from operations	257.5		2.4			259.9		449.0		4.3			453.3
Interest and other income, net	10.1		—			10.1		18.8		—			18.8
Income before taxes	267.6		2.4			270.0		467.8		4.3			472.1
Income tax expense	46.1		0.9			47.0		66.5		1.8			68.3
Net income attributable to Intuitive Surgical, Inc.	$	221.5	$	1.5		$	223.0	$	401.3	$	2.5		$	403.8
Net income per share attributable to Intuitive Surgical, Inc.:
Basic	$	2.00	$	0.01		$	2.01	$	3.60	$	0.02		$	3.62
Diluted	$	1.92	$	0.02		$	1.94	$	3.47	$	0.03		$	3.50
Total comprehensive income attributable to Intuitive Surgical, Inc.	$	219.7	$	1.5		$	221.2	$	400.4	$	2.5		$	402.9

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Selected Condensed Consolidated Statements of Balance Sheet line items, which reflect the impact of adopting the new standard, are as follow (in millions) as of December 31, 2017:

	December 31, 2017
	As Previously Reported		Adjustments			As Restated
ASSETS
Accounts receivable, net	$	511.9	$	(4.0	)	$	507.9
Prepaids and other current assets	$	97.2	$	2.0		$	99.2
Deferred tax assets	$	87.3	$	(15.3	)	$	72.0
Intangibles and other assets, net	$	159.7	$	36.1		$	195.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue	$	284.5	$	(40.7	)	$	243.8
Other accrued liabilities	$	169.5	$	(0.6	)	$	168.9
Other long-term liabilities	$	327.1	$	6.5		$	333.6
Retained earnings	$	61.4	$	53.6		$	115.0

In addition, the cumulative effect of ASC 606 to the Company’s retained earnings at January 1, 2016 was $40.3 million. Adoption of the standard had no impact to total net cash from or used in operating, investing, or financing activities within the Condensed Consolidated Statements of Cash Flows.

As part of the Company’s adoption of ASC 606, the Company elected to use the following practical expedients (i) to exclude disclosures of transaction prices allocated to remaining performance obligations when the Company expects to recognize such revenue for all periods prior to the date of initial application of ASC 606; (ii) not to adjust the promised amount of consideration for the effects of a significant financing component when the Company expects, at contract inception, that the period between the Company’s transfer of a promised product or service to a customer and when the customer pays for that product or service will be one year or less; (iii) to expense costs as incurred for costs to obtain a contract when the amortization period would have been one year or less; (iv) not to recast revenue for contracts that begin and end in the same fiscal year; and (v) not to assess whether promised goods or services are performance obligations if they are immaterial in the context of the contract with the customer.

Intra-Entity Transfer of Assets Other than Inventory

Beginning fiscal 2018, the Company adopted ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfer of Assets Other than Inventory, which requires the recognition of the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The Company adopted this standard using the modified retrospective approach, and as a result, recorded a deferred tax asset with a corresponding cumulative adjustment to retained earnings of $390.8 million as of January 1, 2018, associated with an intra-entity transfer of certain intellectual property rights related to the Company’s non-U.S. business to its Swiss entity. The adjustment may be materially different as a result of recording additional deferred taxes upon finalization of the assessment of global intangible low-taxed income and other aspects from additional guidance and interpretations by U.S. regulatory and standard-setting bodies related to the Tax Cuts and Jobs Act (the “Tax Act”) enacted on December 22, 2017.

Business Combinations: Clarifying the Definition of a Business

Beginning fiscal 2018, the Company adopted ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which clarifies the definition of a business to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses, and applied the new guidance prospectively. In the second quarter of 2018, the Company acquired certain assets related to a distribution business which was accounted for as a business combination. Refer to “Note 4. Balance Sheet Details and Other Information” for further information on the acquisition.

Statement of Cash Flow: Restricted Cash

Beginning fiscal 2018, the Company adopted ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which requires the statement of cash flows to explain the change during the period relating to total cash, cash equivalents, and restricted cash. The Company adopted this standard using the retrospective transition method by restating its condensed consolidated statements of cash flows to include restricted cash of $15.0 million in the beginning and ending cash, cash equivalents, and restricted cash balances for all periods presented. Net cash flows for the six months ended June 30, 2017, did not change as a result of including restricted cash with cash and cash equivalents when reconciling the beginning-of-period and end-of-period amounts presented on the statements of cash flows. Restricted cash was included in intangible and other assets, net on the Company’s condensed consolidated balance sheets.

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Significant Accounting Policies

With the exception of the change in the Company’s Revenue Recognition policy as a result of the adoption of ASC 606, there have been no new or material changes to the significant accounting policies discussed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, that are of significance, or potential significance, to the Company. 

Revenue Recognition

The Company adopted ASC Topic 606, Revenue from Contracts with Customers, on January 1, 2018. The Company’s revenue consists of product revenue resulting from the sale of systems, system components, instruments and accessories, and service revenue. The Company accounts for a contract with a customer when there is a legally enforceable contract between the Company and its customer, the rights of the parties are identified, the contract has commercial substance, and collectability of the contract consideration is probable. The Company’s revenues are measured based on the consideration specified in the contract with each customer, net of any sales incentives and taxes collected from customers that are remitted to government authorities.

The Company’s system sale arrangements generally contain multiple products and services. For these bundled sale arrangements, the Company accounts for individual products and services as separate performance obligations if they are a distinct product or service that is separately identifiable from other items in a bundled package, and if a customer can benefit from the product or service on its own or with other resources that are readily available to the customer. The Company’s system sale arrangements include a combination of the following performance obligations: system(s), system components, system accessories, instruments, accessories, and system service. The Company’s system sale arrangements generally include a five-year period of service. The first year of service is generally free and included in the system sale arrangement and the remaining four years are generally included at a stated service price. The Company considers the service terms in the arrangements that are legally enforceable to be performance obligations. Other than service, the Company generally satisfies all of the performance obligations up-front. System components, system accessories, instruments, accessories, and service are also sold on a stand-alone basis.

The Company recognizes revenues as the performance obligations are satisfied by transferring control of the product or service to a customer. The Company generally recognizes revenue for the performance obligations at the following points in time:

•System sales. For systems, system components, and system accessories sold directly to end customers, revenue is recognized when the Company transfers control to the customer, which is generally at the point when acceptance occurs that indicates customer acknowledgment of delivery or installation, depending on the terms of the arrangement. For systems sold through distributors, revenue is recognized generally at the time of shipment. The Company’s system arrangements generally do not provide a right of return. The systems are generally covered by a one-year warranty. Warranty costs were not material for the periods presented.

•Instruments and accessories. Revenue from sales of instruments and accessories is recognized when control is transferred to the customers, which generally occurs at the time of shipment, but also occurs at the time of delivery depending on the customer arrangement. The Company allows its customers in the normal course of business to return unused products for a limited period of time subsequent to initial purchase and records an allowance against revenue for estimated returns.

•Service. Service revenue is recognized ratably over the term of the service period as the customers benefit from the service throughout the service period. Revenue related to services performed on a time-and-materials basis is recognized when performed.

The Company offers its customers the opportunity to trade in their older systems for a credit towards the purchase of a newer generation system. The Company generally does not provide specified price trade-in rights or upgrade rights at the time of system purchase. Such trade-in or upgrade transactions are separately negotiated based on the circumstances at the time of the trade-in or upgrade, based on the then fair value of the system, and are generally not based on any pre-existing rights granted by the Company. Accordingly, such trade-ins and upgrades are not considered as separate performance obligations in the arrangement for a system sale.

As part of a trade-in transaction, the customer receives a new generation system in exchange for its pre-owned system. The trade-in credit is negotiated at the time of the trade-in and is applied towards the purchase price of the new unit. Traded-in systems generally can be reconditioned and resold. The Company accounts for the fair value of the traded-in system in the total consideration in the arrangement by including the net realizable value of the traded-in system less a normal profit margin. The value of the traded-in system is determined as the amount, after reconditioning costs are added, that will allow a normal profit margin on the sale of the reconditioned unit to be generated. When there is no market for the traded-in units, no value is assigned. Traded-in units are reported as a component of inventory until resold, or otherwise disposed.

In addition, customers may also have the opportunity to upgrade their systems at a price determined at the time of the upgrade, for example, by adding a second surgeon console for use with the da Vinci Si, Xi,andXSurgical System. Such upgrades are performed by completing component level upgrades at the customer’s site. Upgrade revenue is recognized when the component level upgrades are complete and all revenue recognition criteria are met.

9

For multiple-element arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price. Standalone selling prices are based on observable prices at which the Company separately sells the products or services. If a standalone selling price is not directly observable, then the Company estimates the standalone selling price considering market conditions and entity-specific factors including, but not limited to, features and functionality of the products and services, geographies, and type of customer. The Company regularly reviews standalone selling prices and updates these estimates as necessary.

The following table presents revenue disaggregated by types and geography (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
U.S.	2018		2017		2018		2017
Instruments and accessories	$	360.3	$	309.4	$	697.9	$	597.0
Systems	172.4		141.3		296.4		246.7
Services	112.0		101.9		222.8		203.7
Total U.S. revenue	$	644.7	$	552.6	$	1,217.1	$	1,047.4
Outside of U.S. (“OUS”)
Instruments and accessories	$	115.8	$	88.4	$	238.5	$	181.6
Systems	105.0		79.8		215.5		135.2
Services	43.8		38.0		85.7		74.2
Total OUS revenue	$	264.6	$	206.2	$	539.7	$	391.0
Total
Instruments and accessories	$	476.1	$	397.8	$	936.4	$	778.6
Systems	277.4		221.1		511.9		381.9
Services	155.8		139.9		308.5		277.9
Total revenue	$	909.3	$	758.8	$	1,756.8	$	1,438.4

The transaction price allocated to remaining performance obligations relates to amounts allocated to products and services for which revenue has not yet been recognized. A significant portion of this amount relates to performance obligations in the Company’s service contracts that will be satisfied and recognized as revenue in future periods. Transaction price allocated to remaining performance obligations was approximately $1,264.0 million as of June 30, 2018.

The following information summarizes the Company’s contract assets and liabilities (in millions):

	As of
	June 30, 2018		December 31, 2017
Contract assets	$	11.1	$	8.3
Deferred revenue	$	302.2	$	268.6

The Company invoices its customers based on the billing schedules in its sales arrangements. Payments are generally due 30 days from date of invoice. Contract assets for the periods presented primarily represent the difference between the revenue that was recognized based on the relative selling price of the related performance obligations satisfied and the contractual billing terms in the arrangements. Deferred revenue for the periods presented primarily relates to service contracts, where the service fees are billed up-front, generally quarterly or annually, prior to those services having been performed. The associated deferred revenue is generally recognized ratably over the service period. The Company did not have any significant impairment losses on its contract assets for the periods presented.

During the three and six months ended June 30, 2018, the Company recognized revenue of $82.0 million and $197.8 million, respectively, which was included in the deferred revenue balance as of December 31, 2017. During the three and six months ended June 30, 2017, the Company recognized revenue of $68.2 million and $166.7 million, respectively, which was included in the deferred revenue balance as of December 31, 2016.

Assets Recognized from the Costs to Obtain a Contract with a Customer

The Company has determined that certain sales incentives provided to the Company’s sales team meet the requirements to be capitalized when the Company expects to generate future economic benefits from the related revenue generating contracts

10

subsequent to the initial capital sales transaction. When determining the economic life of the contract acquisition assets recognized, the Company considers historical service renewal rates, expectations of future customer renewals of service contracts, and other factors that could impact the economic benefits that the Company expects to generate from the relationship with its customers. The costs capitalized as contract acquisition costs included in intangible and other assets, net in the Company’s condensed consolidated balance sheets were $31.0 million and $31.4 million as of June 30, 2018, and December 31, 2017, respectively. The Company did not incur any impairment losses during the periods presented.

NOTE 3.    FINANCIAL INSTRUMENTS

Cash, Cash Equivalents, and Investments

The following tables summarize the Company’s cash and available-for-sale marketable securities’ amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category reported as cash and cash equivalents, short-term, or long-term investments as of June 30, 2018, and December 31, 2017 (in millions):

										Reported as:
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short- term Investments		Long- term Investments
June 30, 2018
Cash	$	242.0	$	—	$	—		$	242.0	$	242.0	$	—	$	—
Level 1:
Money market funds	738.7		—		—			738.7		738.7		—		—
U.S. treasuries	1,192.5		—		(8.1		)	1,184.4		63.4		627.2		493.8
Subtotal	1,931.2		—		(8.1		)	1,923.1		802.1		627.2		493.8
Level 2:
Commercial paper	170.2		—		—			170.2		112.9		57.3		—
Corporate debt securities	1,036.2		0.4		(6.1		)	1,030.5		3.2		581.1		446.2
U.S. government agencies	882.3		0.2		(6.2		)	876.3		43.3		454.1		378.9
Municipal securities	17.5		—		—			17.5		—		9.3		8.2
Subtotal	2,106.2		0.6		(12.3		)	2,094.5		159.4		1,101.8		833.3
Total assets measured at fair value	$	4,279.4	$	0.6	$	(20.4	)	$	4,259.6	$	1,203.5	$	1,729.0	$	1,327.1

										Reported as:
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short- term Investments		Long- term Investments
December 31, 2017
Cash	$	197.7	$	—	$	—		$	197.7	$	197.7	$	—	$	—
Level 1:
Money market funds	445.0		—		—			445.0		445.0		—		—
U.S. treasuries	1,029.1		—		(4.7		)	1,024.4		5.5		396.2		622.7
Subtotal	1,474.1		—		(4.7		)	1,469.4		450.5		396.2		622.7
Level 2:
Commercial paper	38.4		—		—			38.4		—		38.4		—
Corporate debt securities	946.6		0.2		(4.4		)	942.4		—		403.9		538.5
U.S. government agencies	901.3		—		(4.4		)	896.9		—		311.7		585.2
Non-U.S. government securities	2.5		—		—			2.5		—		2.5		—
Municipal securities	301.1		—		(1.9		)	299.2		—		159.7		139.5
Subtotal	2,189.9		0.2		(10.7		)	2,179.4		—		916.2		1,263.2
Total assets measured at fair value	$	3,861.7	$	0.2	$	(15.4	)	$	3,846.5	$	648.2	$	1,312.4	$	1,885.9

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The following table summarizes the contractual maturities of the Company’s cash equivalents and available-for-sale investments (excluding cash and money market funds), as of June 30, 2018 (in millions):

	Amortized Cost		Fair Value
Mature in less than one year	$	1,957.5	$	1,951.8
Mature in one to five years	1,341.2		1,327.1
Total	$	3,298.7	$	3,278.9

Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay certain obligations. Realized gains and losses, recognized on the sale of investments, were not material for any of the periods presented. There were no transfers between Level 1 and Level 2 measurements during the six months ended June 30, 2018, and there were no changes in the valuation techniques used by the Company.

Foreign Currency Derivatives

The objective of the Company’s hedging program is to mitigate the impact of changes in currency exchange rates on cash flow from foreign currency denominated sales, expenses, intercompany balances, and other monetary assets or liabilities denominated in currencies other than the U.S. dollar (“USD”). The terms of the Company’s derivative contracts are generally twelve months or shorter. The derivative assets and liabilities are measured using Level 2 fair value inputs.

Cash Flow Hedges

The Company enters into currency forward contracts as cash flow hedges to hedge certain forecasted revenue transactions denominated in currencies other than the USD, primarily the European Euro (“EUR”), the British Pound (“GBP”), the Japanese Yen (“JPY”), and the Korean Won (“KRW”). The Company also enters into currency forward contracts as cash flow hedges to hedge certain forecasted expense transactions denominated in EUR and the Swiss Franc (“CHF”).

For these derivatives, the Company reports the after-tax gain or loss from the hedge as a component of accumulated other comprehensive gain (loss) in stockholders’ equity and reclassifies it into earnings in the same period in which the hedged transaction affects earnings. The amounts reclassified to revenue and expenses related to the hedged transactions and the ineffective portions of cash flow hedges were not material for the periods presented.

Other Derivatives Not Designated as Hedging Instruments

Other derivatives not designated as hedging instruments consist primarily of forward contracts that the Company uses to hedge intercompany balances and other monetary assets or liabilities denominated in currencies other than the USD, primarily the EUR, GBP, JPY, KRW, and CHF. The net gains (losses) recognized in interest and other income, net in the Condensed Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2018, and 2017, were not material.

The notional amounts for derivative instruments provide one measure of the transaction volume. Total gross notional amounts (in USD) for outstanding derivatives and aggregate gross fair value at the end of each period were as follows (in millions):

	Derivatives Designated as Hedging Instruments				Derivatives Not Designated as Hedging Instruments
	June 30, 2018		December 31, 2017		June 30, 2018		December 31, 2017
Notional amounts:
Forward contracts	$	138.1	$	128.5	$	143.3	$	168.4
Gross fair value recorded in:
Prepaids and other current assets	$	4.5	$	0.9	$	2.9	$	1.2
Other accrued liabilities	$	0.8	$	2.9	$	0.8	$	4.6

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NOTE 4.    BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION

Balance Sheet Details

The following tables provide details of selected balance sheet items (in millions):

	As of
Inventory	June 30, 2018		December 31, 2017
Raw materials	$	129.5	$	80.9
Work-in-process	35.9		19.7
Finished goods	166.1		140.6
Total inventory	$	331.5	$	241.2

	As of
Other accrued liabilities - short-term	June 30, 2018		December 31, 2017
Taxes payable	$	17.9	$	63.1
Litigation related accruals	59.8		13.8
Other accrued liabilities	86.4		92.0
Total other accrued liabilities—short-term	$	164.1	$	168.9

	As of
Other long-term liabilities	June 30, 2018		December 31, 2017
Income taxes—long-term	$	262.5	$	286.8
Deferred revenue—long-term	30.1		24.8
Other long-term liabilities	21.4		22.0
Total other long-term liabilities	$	314.0	$	333.6

Goodwill and Intangible Assets

The increases in goodwill and intangible assets from December 31, 2017, to June 30, 2018, primarily relate to the termination of the Company’s India distribution relationship with Vattikuti Technologies Pvt. Ltd. and acquisition of certain assets related to that distribution business on May 25, 2018, that collectively met the definition of a business and was accounted for as a business combination. The transaction enhances the Company’s ability to serve patients, surgeons, and hospitals in India. 

The purchase consideration consisted of a cash payment of $38.1 million, which was preliminarily allocated to net tangible assets of $4.1 million, goodwill of $9.8 million, and intangible assets of $24.2 million related to reacquired distribution rights, customer relationships, and a non-compete agreement, which are being amortized over a weighted average period of 4.3 years.

The Company has included the results of the Indian operations post the date of acquisition in its Financial Statements, which have not been material to date. Pro forma results of operations related to the acquisition have not been presented since the operating results of the acquired business are not material to the Company’s Financial Statements.

Supplemental Cash Flow Information

The following table provides supplemental non-cash investing activities (in millions):

	Six Months Ended June 30,
	2018		2017
Equipment transfers, including operating lease assets, from inventory to property, plant, and equipment	$	49.0	$	29.6

NOTE 5.    LEASE RECEIVABLES

Lease receivables relating to sales-type lease arrangements are presented on the Condensed Consolidated Balance Sheets as follows (in millions):

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	As of
	June 30, 2018			December 31, 2017
Gross lease receivables	$	132.8		$	128.0
Unearned income	(5.1		)	(5.0		)
Allowance for credit loss	(1.0		)	(0.9		)
Net investment in sales-type leases	$	126.7		$	122.1
Reported as:
Prepaids and other current assets	$	47.2		$	41.9
Intangible and other assets, net	79.5			80.2
Total, net	$	126.7		$	122.1

Contractual maturities of gross lease receivables at June 30, 2018, are as follows (in millions):

	Amount
2018	$	21.7
2019	45.2
2020	34.6
2021	18.7
2022	10.1
2023 and thereafter	2.5
Total	$	132.8

NOTE 6.    CONTINGENCIES

The Company is involved in a variety of claims, lawsuits, investigations and proceedings relating to securities laws, product liability, intellectual property, insurance, contract disputes, employment, and other matters. Certain of these lawsuits and claims are described in further detail below. It is not possible to predict what the outcome of these matters will be and the Company cannot guarantee that any resolution will be reached on commercially reasonable terms, if at all.

A liability and related charge to earnings are recorded in the Company’s Financial Statements for legal contingencies when the loss is considered probable and the amount can be reasonably estimated. The assessment is re-evaluated each accounting period and is based on all available information, including impact of negotiations, settlements, rulings, advice of legal counsel, and other information and events pertaining to each case. Nevertheless, it is possible that additional future legal costs (including settlements, judgments, legal fees, and other related defense costs) could have a material adverse effect on the Company’s business, financial position, or future results of operations. During the three and six months ended June 30, 2018, the Company recorded pre-tax charges of $42.5 million and $47.0 million, respectively, related to the securities class action lawsuits and the tolled product liability claims described below. A total of $58.3 million and $12.8 million associated with these matters were included in other accrued liabilities in the accompanying Condensed Consolidated Balance Sheets as of June 30, 2018, and December 31, 2017, respectively.

Purported Shareholder Class Action Lawsuits filed April 26, 2013, and May 24, 2013

On April 26, 2013, a purported class action lawsuit entitled Abrams v. Intuitive Surgical, et al., No. 5-13-cv-1920, was filed against a number of the Company’s current and former officers and directors in the U.S. District Court for the Northern District of California. A substantially identical complaint, entitled Adel v. Intuitive Surgical, et al., No. 5:13-cv-02365, was filed in the same court against the same defendants on May 24, 2013. The Adel case was voluntarily dismissed without prejudice on August 20, 2013.

On October 15, 2013, plaintiffs in the Abrams matter filed an amended complaint. The case has since been retitled In re Intuitive Surgical Securities Litigation, No. 5:13-cv-1920. The plaintiffs seek unspecified damages on behalf of a putative class of persons who purchased or otherwise acquired the Company’s common stock between February 6, 2012, and July 18, 2013. The amended complaint alleges that the defendants violated federal securities laws by allegedly making false and misleading statements and omitting certain material facts in certain public statements and in the Company’s filings with the SEC. On November 18, 2013, the court appointed the Employees’ Retirement System of the State of Hawaii as lead plaintiff and appointed lead counsel. The Company filed a motion to dismiss the amended complaint on December 16, 2013, which was granted in part and denied in part on August 21, 2014. The plaintiffs elected not to further amend their complaint at that time. The plaintiffs moved for class certification on September 1, 2015, and following opposition and reply briefing, the court held a hearing on the motion on January 21, 2016. On November 2, 2016, Labaton Sucharow LLP filed a motion for leave to file an amended complaint. On December 22, 2016, the court entered an order granting plaintiffs’ motion for class certification. On January 25, 2017, the court entered an

14

order granting plaintiffs’ motion for leave to amend the complaint. On February 9, 2017, the Company moved to dismiss the amended complaint. Following opposition and reply briefing, the matter was fully submitted to the court on March 2, 2017. The court denied the motion on September 29, 2017. On July 13, 2017, the parties filed a stipulation vacating the case schedule, which the court entered on July 14, 2017. On November 8, 2017, the court entered a new case schedule, with trial set to begin on October 30, 2018.

On December 6, 2017, plaintiffs moved for approval of a proposed notice to the class members; the Company partially opposed that motion. The court held a hearing regarding the motion on March 8, 2018, and ordered the parties to edit the proposed notice and submit it to the court for approval. On March 9, 2018, the parties submitted a joint proposed notice, which the court approved on March 12, 2018. On February 9, 2018, the Company filed a motion for summary judgment, which plaintiffs opposed on March 23, 2018. On June 11, 2018, the Company reached an agreement in principle to enter into a settlement agreement which stipulates a payment of $42.5 million by the Company, subject to approval by the U.S. District Court for the Northern District of California. The agreement in principle is subject to certain conditions, including court approval of a final settlement agreement. There can be no assurance that the parties will enter into a final settlement agreement or that such agreement will be approved by the court. During the three and six months ended June 30, 2018, the Company recorded a pre-tax charge of $42.5 million for this matter.

Product Liability Litigation

The Company is currently named as a defendant in a number of individual product liability lawsuits filed in various state and federal courts. The plaintiffs generally allege that they or a family member underwent surgical procedures that utilized the da Vinci Surgical System and sustained a variety of personal injuries and, in some cases death as a result of such surgery. Several of these cases have trial dates in the next 12 months.

The cases raise a variety of allegations including, to varying degrees, that plaintiffs’ injuries resulted from purported defects in the da Vinci Surgical System and/or failure on the Company’s part to provide adequate training resources to the healthcare professionals who performed plaintiffs’ surgeries. The cases further allege that the Company failed to adequately disclose and/or misrepresented the potential risks and/or benefits of the da Vinci Surgical System. Plaintiffs also assert a variety of causes of action, including for example, strict liability based on purported design defects, negligence, fraud, breach of express and implied warranties, unjust enrichment, and loss of consortium. Plaintiffs seek recovery for alleged personal injuries and, in many cases, punitive damages.

In addition to the filed cases, the Company received a substantial number of claims relating to alleged complications from surgeries performed with certain versions of Monopolar Curved Scissor (“MCS”) instruments which included an MCS tip cover accessory that was the subject of a market withdrawal in 2012 and MCS instruments that were the subject of a recall in 2013. In an effort to avoid the expense and distraction of defending multiple lawsuits, the Company entered into tolling agreements to pause the applicable statutes of limitations for many of these claims and engaged in confidential mediation efforts. As of June 30, 2018, all such “tolling agreements” have expired and the majority of the “tolled claims” have either been resolved or the matters have been filed.

During the three and six months ended June 30, 2018, the Company recorded pre-tax charges of zero and $4.5 million, respectively, compared with $2.5 million and $16.0 million, for the three and six months ended June 30, 2017, respectively, to reflect the estimated cost of settling a number of the product liability claims that are or that had been covered by the tolling agreements. As of June 30, 2018, and December 31, 2017, a total of $15.8 million and $12.8 million, respectively, were included in other accrued liabilities in the accompanying Condensed Consolidated Balance Sheets related to the tolled product liability claims.

The Company’s estimate of the anticipated cost of resolving the pending cases is based on negotiations with attorneys for the claimants. Nonetheless, it is possible that more claims will be made by additional individuals. Consequently, the final outcome of these claims is dependent on many variables that are difficult to predict and the ultimate cost associated with these product liability claims may be materially different than the amount of the current estimate and accruals and could have a material adverse effect on the Company’s business, financial position, and future results of operations. Although there is a reasonable possibility that a loss in excess of the amount recognized exists, the Company is unable to estimate the possible loss or range of loss in excess of the amount recognized at this time.

15

Patent Litigation

On June 30, 2017, Ethicon LLC, Ethicon Endo-Surgery, Inc., and Ethicon US LLC (collectively, “Ethicon”) filed a complaint for patent infringement against the Company in the U.S. District Court for the District of Delaware. The complaint, which was served on the Company on July 12, 2017, alleges that the Company’s EndoWrist Stapler instruments infringe several of Ethicon’s patents. Ethicon asserts infringement of U.S. Patent Nos. 9,585,658, 8,479,969, 9,113,874, 8,998,058, 8,991,677, 9,084,601, and 8,616,431. The parties are currently engaged in fact discovery regarding Ethicon’s allegations. A claim construction hearing is set for October 1, 2018. Based on currently available information, the Company is unable to make a reasonable estimate of loss or range of losses, if any, arising from this matter.

NOTE 7.    STOCKHOLDERS’ EQUITY

Stock Repurchase Program

The Company’s Board of Directors (the “Board”) has authorized an aggregate of $6.2 billion of funding for the Company’s common stock repurchase program (the “Repurchase Program”) since its establishment in March 2009. The most recent authorization occurred in December 2016 when the Board increased the authorized amount available under Repurchase Program to $3.0 billion. As of June 30, 2018, the remaining amount of share repurchases authorized by the Board was approximately $717.5 million.

There were no shares repurchased during the six months ended June 30, 2018. On January 24, 2017, the Company entered into an accelerated share repurchase program (the “ASR Program”) with Goldman Sachs & Co. LLC (“Goldman”) and Goldman delivered to the Company approximately 7.3 million shares of the Company’s common stock, for which the Company made a payment of $2.0 billion to Goldman. On December 7, 2017, the Company completed the ASR Program by making a final settlement payment of $274.0 million to Goldman. The final average price per share paid under the ASR Program was $310.32.

Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income (loss), net of tax, for the three and six months ended June 30, 2018, and 2017, are as follows (in millions):

	Three Months Ended June 30, 2018
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	(3.2	)	$	(17.5	)	$	6.8		$	(4.2	)	$	(18.1	)
Other comprehensive income (loss) before reclassifications	6.2			0.8			(5.9		)	(0.3		)	0.8
Amounts reclassified from accumulated other comprehensive income (loss)	0.4			—			—			0.5			0.9
Net current-period other comprehensive income (loss)	6.6			0.8			(5.9		)	0.2			1.7
Ending balance	$	3.4		$	(16.7	)	$	0.9		$	(4.0	)	$	(16.4	)
	Three Months Ended June 30, 2017
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	1.1		$	(5.8	)	$	0.5		$	(3.8	)	$	(8.0	)
Other comprehensive income (loss) before reclassifications	(3.0		)	0.4			0.5			—			(2.1		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			0.1			—			0.2			0.3
Net current-period other comprehensive income (loss)	(3.0		)	0.5			0.5			0.2			(1.8		)
Ending balance	$	(1.9	)	$	(5.3	)	$	1.0		$	(3.6	)	$	(9.8	)

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	Six Months Ended June 30, 2018
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	(2.4	)	$	(11.3	)	$	2.3		$	(4.1	)	$	(15.5	)
Other comprehensive income (loss) before reclassifications	3.2			(6.6		)	(1.4		)	—			(4.8		)
Amounts reclassified from accumulated other comprehensive income (loss)	2.6			1.2			—			0.1			3.9
Net current-period other comprehensive income (loss)	5.8			(5.4		)	(1.4		)	0.1			(0.9		)
Ending balance	$	3.4		$	(16.7	)	$	0.9		$	(4.0	)	$	(16.4	)
	Six Months Ended June 30, 2017
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	5.0		$	(8.6	)	$	(1.3	)	$	(4.0	)	$	(8.9	)
Other comprehensive income (loss) before reclassifications	(5.1		)	3.3			2.3			0.1			0.6
Amounts reclassified from accumulated other comprehensive income (loss)	(1.8		)	—			—			0.3			(1.5		)
Net current-period other comprehensive income (loss)	(6.9		)	3.3			2.3			0.4			(0.9		)
Ending balance	$	(1.9	)	$	(5.3	)	$	1.0		$	(3.6	)	$	(9.8	)

Retained Earnings

For the three and six months ended June 30, 2018, retained earnings balance included a reduction of $5.2 million and $101.9 million, respectively, for shares withheld related to net share settlements of employee equity awards.

NOTE 8.    SHARE-BASED COMPENSATION

As of June 30, 2018, approximately 4.7 million shares of common stock were reserved for future issuance under the Company’s stock plans. A maximum of approximately 2.0 million of these shares can be awarded as restricted stock units (“RSUs”).

Stock Option Information

A summary of stock option activity under all stock plans for the six months ended June 30, 2018, is presented as follows (in millions, except per share amounts):

	Stock Options Outstanding
	Number Outstanding		Weighted Average Exercise Price Per Share
Balance at December 31, 2017	7.2		$	164.16
Granted	0.3		$	422.16
Exercised	(0.9	)	$	123.78
Forfeited/expired	(0.1	)	$	209.31
Balance at June 30, 2018	6.5		$	179.88

As of June 30, 2018, options to purchase an aggregate of 5.2 million shares of common stock were exercisable at a weighted average price of $155.63 per share.

Restricted Stock Units Information

A summary of RSU activity for the six months ended June 30, 2018, is presented as follows (in millions, except per share amounts):

17

	Shares		Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2017	2.1		$	209.55
Granted	0.8		$	419.66
Vested	(0.7	)	$	191.87
Forfeited	(0.1	)	$	257.10
Unvested balance at June 30, 2018	2.1		$	284.65

Employee Stock Purchase Plan

Under the Employee Stock Purchase Plan (“ESPP”), employees purchased approximately 0.1 million shares for $25.3 million and approximately 0.1 million shares for $20.9 million during the six months ended June 30, 2018, and 2017, respectively.

Share-based Compensation Expense

The following table summarizes share-based compensation expense for the three and six months ended June 30, 2018, and 2017 (in millions):

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2018		2017		2018		2017
Cost of sales - products	$	8.9	$	6.7	$	17.1	$	13.5
Cost of sales - services	4.1		3.5		8.0		6.7
Total cost of sales	13.0		10.2		25.1		20.2
Selling, general and administrative	32.7		26.6		62.2		52.3
Research and development	17.9		13.8		34.2		25.7
Share-based compensation expense before income taxes	63.6		50.6		121.5		98.2
Income tax benefit	12.8		16.4		25.1		31.9
Share-based compensation expense after income taxes	$	50.8	$	34.2	$	96.4	$	66.3

The Black-Scholes option pricing model is used to estimate the fair value of stock options granted under the Company’s stock plans and rights to acquire stock granted under the Company’s ESPP. The weighted average estimated fair values of stock options and rights to acquire stock under the ESPP, as well as the weighted average assumptions used in calculating those fair values, were as follows:

	Three Months Ended   June 30,						Six Months Ended   June 30,
	2018			2017			2018			2017
Stock Options
Risk-free interest rate	2.7		%	1.8		%	2.6		%	2.0		%
Expected term (in years)	4.2			4.2			4.3			4.3
Expected volatility	33		%	22		%	33		%	24		%
Fair value at grant date	$	139.43		$	59.91		$	131.53		$	57.04
ESPP
Risk-free interest rate	—			—			1.9		%	0.9		%
Expected term (in years)	—			—			1.2			1.3
Expected volatility	—			—			32		%	26		%
Fair value at grant date	—			—			$	124.61		$	61.59

NOTE 9.    INCOME TAXES

Income tax expense for the three months ended June 30, 2018, was $41.0 million, or 13.9% of income before taxes, compared with $47.0 million, or 17.4% of income before taxes, for the three months ended June 30, 2017. Income tax expense for the six months ended June 30, 2018, was $43.6 million, or 7.4% of income before taxes, compared with $68.3 million, or 14.5% of income before taxes for the six months ended June 30, 2017.

The effective tax rates for the three and six months ended June 30, 2018, differed from the U.S. federal statutory rate of 21% primarily due to excess tax benefits associated with employee equity plans and federal R&D credit benefits, partially offset by state income taxes. The effective tax rates for the three and six months ended June 30, 2017, differed from the U.S. federal statutory

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rate of 35% primarily due to excess tax benefits associated with employee equity plans and the effect of certain foreign earnings being taxed at rates lower than the federal statutory rate, partially offset by state income taxes.

In connection with the Tax Act enacted in December 2017, the Company recorded a provisional amount of $317.8 million in its income tax expense for the year ended December 31, 2017. In accordance with relevant SEC guidance, the effects of the Tax Act may be adjusted within a one-year measurement period from the enactment date for items that were previously reported as provisional, or where a provisional estimate could not be made. Income tax provision for the three and six months ended June 30, 2018, did not reflect any adjustment to the previously assessed Tax Act enactment effect. Income tax expense for the three and six months ended June 30, 2018, reflected $6.4 million and $15.5 million, respectively, estimated tax on global intangible low-taxed income enacted by the Tax Act. For the global intangible low-taxed income provisions of the Tax Act, the Company has not yet elected an accounting policy with respect to either recognize deferred taxes for basis differences expected to reverse as global intangible low-taxed income, or to record such as period costs if and when incurred. The Company will continue to assess forthcoming guidance and accounting interpretations on the effects of the Tax Act and expects to complete its analysis within the measurement period in accordance with the SEC guidance. As a result of the Tax Act, the provisional amount recorded in December 2017 included a one-time deemed repatriation toll charge on the cumulative undistributed foreign earnings through 2017. In June 2018, the Company repatriated to the U.S. $1.6 billion of cumulative undistributed foreign earnings in the form of cash, cash equivalents, and investments of $1.4 billion and a note of $0.2 billion without significant incremental tax impact. The Company is still evaluating whether to change its indefinite reinvestment assertion for years after 2017 in light of the Tax Act. If the Company subsequently changes its assertion during the measurement period, the Company will account for the change in assertion as part of the Tax Act enactment.

As of June 30, 2018, the Company had a total of gross unrecognized tax benefits of $74.6 million compared with $65.4 million as of December 31, 2017, representing a net increase of approximately $9.2 million for the six months ended June 30, 2018. The net increase was primarily related to 2018 uncertain tax positions. If recognized, the gross unrecognized tax benefits would reduce the effective tax rate in the period of recognition.

The Company files federal, state, and foreign income tax returns in many U.S. and OUS jurisdictions. Years before 2015 are closed for the significant jurisdictions. Certain of the Company’s unrecognized tax benefits could change due to activities of various tax authorities, including potential assessment of additional tax, possible settlement of audits, or through normal expiration of various statutes of limitations, which could affect the Company’s effective tax rate in the period in which they change. Due to the uncertainty related to the timing and potential outcome of audits, the Company cannot estimate the range of reasonably possible change in unrecognized tax benefits that may occur in the next 12 months.

The Company is subject to the examination of its income tax returns by the Internal Revenue Service and other tax authorities. The outcome of these audits cannot be predicted with certainty. The Company’s management regularly assesses the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of the Company’s provision for income taxes. If any issues addressed in the Company’s tax audits are resolved in a manner not consistent with management’s expectations, the Company could be required to adjust its provision for income taxes in the period such resolution occurs.

NOTE 10.    NET INCOME PER SHARE

The following table presents the computation of basic and diluted net income per share attributable to Intuitive Surgical, Inc. for the three and six months ended June 30, 2018, and 2017 (in millions, except per share amounts):

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2018		2017		2018		2017
Numerator:
Net income attributable to Intuitive Surgical, Inc.	$	255.3	$	223.0	$	542.9	$	403.8
Denominator:
Weighted average shares outstanding used in basic calculation	113.5		111.0		113.2		111.6
Add: dilutive effect of potential common shares	5.0		4.2		5.1		3.9
Weighted average shares outstanding used in diluted calculation	118.5		115.2		118.3		115.5
Net income per share attributable to Intuitive Surgical, Inc.:
Basic	$	2.25	$	2.01	$	4.80	$	3.62
Diluted	$	2.15	$	1.94	$	4.59	$	3.50

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Share-based compensation awards of approximately 0.3 million and 0.3 million shares for the three months ended June 30, 2018, and 2017, respectively, and approximately 0.2 million and 0.7 million shares for the six months ended June 30, 2018, and 2017, respectively, were outstanding, but were not included in the computation of diluted net income per share attributable to Intuitive Surgical, Inc. common stockholders because the effect of including such shares would have been anti-dilutive in the periods presented.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

In this report, “Intuitive Surgical,” “Intuitive,” the “Company,” “we,” “us,” and “our” refer to Intuitive Surgical, Inc. and its wholly- and majority-owned subsidiaries.

This management’s discussion and analysis of financial condition as of June 30, 2018, and results of operations for the three and six months ended June 30, 2018, and 2017, should be read in conjunction with management’s discussion and analysis of financial condition and results of operations included in our Annual Report on Form 10-K for the year ended December 31, 2017.

This report contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Forward-looking statements relate to expectations concerning matters that are not historical facts. Words such as “estimates,” “projects,” “believes,” “anticipates,” “plans,” “expects,” “intends,” “may,” “will,” “could,” “should,” “would,” “targeted” and similar words and expressions are intended to identify forward-looking statements. These forward-looking statements include, but are not limited to, statements related to provisional income tax expense related to the Tax Cuts and Jobs Act, the potential impact of the final resolution of provisional estimates and potential subsequent adjustments due to additional guidance from and interpretations by regulatory and standard-setting bodies and changes in assumptions, our expected business, new product introductions, procedures and procedure adoption, future results of operations, future financial position, our ability to increase our revenues, the anticipated mix of our revenues between product and service revenues, our financing plans and future capital requirements, anticipated costs of revenue, anticipated expenses, our potential tax assets or liabilities, the effect of recent accounting pronouncements, our investments, anticipated cash flows, our ability to finance operations from cash flows and similar matters, and statements based on current expectations, estimates, forecasts and projections about the economies and markets in which we operate and our beliefs and assumptions regarding these economies and markets. These forward-looking statements should, therefore, be considered in light of various important factors, including, but not limited to, the following: the impact of global and regional economic and credit market conditions on healthcare spending; healthcare reform legislation in the United States and its impact on hospital spending, reimbursement, and fees levied on certain medical device revenues; changes in hospital admissions and actions by payers to limit or manage surgical procedures; the timing and success of product development and market acceptance of developed products; the results of any collaborations, in-licensing arrangements, joint ventures, strategic alliances or partnerships; procedure counts; regulatory approvals, clearances and restrictions, or any dispute that may occur with any regulatory body; guidelines and recommendations in the healthcare and patient communities; intellectual property positions and litigation; competition in the medical device industry and in the specific markets of surgery in which we operate; unanticipated manufacturing disruptions or the inability to meet demand for products; the results of legal proceedings to which we are or may become a party; product liability and other litigation claims; adverse publicity regarding us and the safety of our products and adequacy of training; our ability to expand into foreign markets; the impact of changes to tax legislation, guidance, and interpretations; and other risk factors. Readers are cautioned not to place undue reliance on these forward-looking statements, which are based on current expectations and are subject to risks, uncertainties, and assumptions that are difficult to predict, including those risk factors described throughout this filing and in the Annual Report on Form 10-K for the fiscal year ended December 31, 2017, and other periodic filings with the Securities and Exchange Commission. Our actual results may differ materially and adversely from those expressed in any forward-looking statement. We undertake no obligation to publicly update or release any revisions to these forward-looking statements, except as required by law.

Intuitive^®, Intuitive Surgical^®, da Vinci^®, da Vinci S^®, da Vinci S HD Surgical System^®, da Vinci Si^®, da Vinci Si HD Surgical System^®, da Vinci Xi^®, da Vinci SP^®, EndoWrist^®, Firefly^®, InSite^®, da Vinci Connect^®, Intuitive Surgical EcoSystem^®, da Vinci X^®, SureForm 60^® and SmartFire^® are trademarks of Intuitive Surgical, Inc.

Overview

Open surgery remains a significant form of surgery and is commonly used in most areas of the body. However, the large incisions required for open surgery create trauma to patients, typically resulting in longer hospitalization and recovery times, increased hospitalization costs, and additional pain and suffering relative to MIS, where MIS is available. For over three decades, MIS has reduced trauma to patients by allowing selected surgeries to be performed through small ports rather than large incisions. MIS has been widely adopted for certain surgical procedures.

Da Vinci Surgical Systems enable surgeons to extend the benefits of MIS to many patients who would otherwise undergo a more invasive surgery by using computational, robotic and imaging technologies to overcome many of the limitations of conventional MIS. Surgeons using a da Vinci Surgical System operate while seated comfortably at a console viewing a 3-D representation of an HD image of the surgical field. This immersive visualization connects surgeons to the surgical field and their instruments. While seated at the console, the surgeon manipulates instrument controls in a natural manner, similar to the open surgery technique. Our technology is designed to provide surgeons with a range of motion of MIS instruments in the surgical field analogous to the motions of a human wrist, while filtering out the tremor inherent in a surgeon’s hand. In designing our products, we focus on making our technology easy and safe to use.

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Our products fall into four broad categories - the da Vinci Surgical Systems, InSite and Firefly Fluorescence imaging systems (“Firefly”), instruments and accessories (e.g., EndoWrist, EndoWrist Vessel Sealer, da Vinci Single-Site and EndoWrist Stapler), and training technologies. Across these categories, within an integrated ecosystem, our products are designed to decrease variability in surgery by offering consistency in functionality and user experience with dependability for surgeons seeking better outcomes. With our “systems” approach, we offer intelligent technology and systems designed to work together to make MIS intervention more available and applicable.

We have commercialized the following four generational platforms of da Vinci Surgical Systems: Our first generation da Vinci standard Surgical System, commercialized in 1999, our second generation da Vinci S Surgical System, commercialized in 2006, our third generation da Vinci Si Surgical System, commercialized in 2009, and our fourth generation, beginning with the da Vinci Xi Surgical System, commercialized in 2014, followed by the da Vinci X Surgical System, commercialized in the second quarter of 2017. During the second quarter 2018, we obtained a new U.S. Food and Drug Administration (“U.S. FDA”) clearance for the da Vinci SP Surgical System for urologic surgical procedures. The da Vinci SP Surgical System is a single port approach and an extension of our fourth generation platform. We plan to launch the da Vinci SP Surgical System in the U.S. in a measured fashion, with customer shipments expected to begin in the second half of 2018. We will seek U.S. FDA approvals for additional SP indications over time. Our da Vinci Surgical Systems include a surgeon’s console (or consoles), imaging electronics, a patient-side cart, and computational hardware and software.

We offer over 80 different multi-port da Vinci instruments enabling surgeons’ flexibility in choosing the types of tools needed in a particular surgery. These multi-port instruments are generally robotically controlled versions of surgical tools that surgeons would use in either open or laparoscopic surgery. We offer advanced instrumentation for the da Vinci Si, da Vinci Xi, and da Vinci X platforms, including the EndoWrist Vessel Sealer and EndoWrist Stapler products to provide surgeons with sophisticated, computer-aided tools to precisely and efficiently interact with tissue. Da Vinci X and da Vinci Xi Surgical Systems share the same instruments while the da Vinci Si Surgical System uses different instruments. Initially we will offer nine instruments on our da Vinci SP Surgical System and we will expand that over time.

We offer Single-Site instruments for use with the da Vinci Si, da Vinci Xi, and da Vinci X Surgical Systems. Single-Site instruments are most commonly used in cholecystectomy and hysterectomy procedures. Single-Site instruments enable surgeons to also perform surgery through a single port via the patient’s belly button, resulting in the potential for virtually scarless results.

Training technologies include our da Vinci Skills Simulator, da Vinci Connect remote case observation and mentoring tool, and our dual console for use in surgeon proctoring and collaborative surgery.

Business Model

Overview

We generate revenue from the initial capital sales of da Vinci Surgical Systems, including systems under sales-type lease arrangements, and revenue from operating lease arrangements and from the subsequent sales of instruments, accessories, and service. The da Vinci Surgical System generally sells for approximately between $0.5 million and $2.5 million, depending upon the model, configuration and geography, and represents a significant capital equipment investment for our customers. Our instruments and accessories have limited lives and will either expire or wear out as they are used in surgery, at which point they need to be replaced. We typically enter into service contracts at the time systems are sold at an annual rate of approximately $80,000 to $170,000, depending upon the configuration of the underlying system and composition of the services offered under the contract. These service contracts have generally been renewed at the end of the initial contractual service periods.

We adopted ASC 606, Revenue from Contracts with Customers, effective January 1, 2018, using the full retrospective method. The financial results for 2016 and 2017 have been restated to reflect this adoption. The adoption did not have a material impact on revenue recognized for the periods presented in our Financial Statements. Periods prior to 2016 have not been restated under ASC 606, and therefore, are not comparable in the annual revenue discussions outlined below. Refer to “Note 2. Summary of Significant Accounting Policies” within Part I, Item 1 of this Form 10-Q for further information on the impact of adopting ASC 606.

Recurring Revenue

Recurring revenue consists of instrument and accessory revenue, service revenue, and operating lease revenue. Recurring revenue increased to $2.2 billion, or 71% of total revenue in 2017, compared with $1.9 billion, or 71% of total revenue in 2016, and $1.7 billion, or 70% of total revenue in 2015. The growth of recurring revenue and its gradually increasing proportion of total revenue over the years largely reflect continued procedure adoption and increased system utilization on a growing base of installed da Vinci Surgical Systems. The installed base of da Vinci Surgical Systems has grown to approximately 4,666 at June 30, 2018.

Instrument and accessory revenue has generally grown at a faster rate than system revenue in the last few fiscal years. Instrument and accessory revenue increased to $1.6 billion in 2017, compared with $1.4 billion in 2016 and $1.2 billion in 2015. The growth of instrument and accessory revenue largely reflects continued procedure adoption.

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Service revenue growth has been driven by the growth of the base of installed da Vinci Surgical Systems. The installed base of da Vinci Surgical Systems grew 13% to approximately 4,409 at December 31, 2017; 9% to approximately 3,919 at December 31, 2016; and 10% to approximately 3,597 at December 31, 2015. Service revenue grew 12% to $572.9 million in 2017; 10% to $510.7 million in 2016; and 8% to $464.8 million in 2015.

Operating lease revenue has grown as a larger proportion of systems shipped are under operating lease arrangements. In the years ended December 31, 2017, 2016, and 2015, a total of 108, 62, and 43 of system placements were classified as operating leases, respectively. Revenue from operating lease arrangements is generally recognized on a straight-line basis over the lease term. Operating lease revenue for the years ended December 31, 2017, 2016, and 2015, was $25.9 million, $16.6 million and $7.0 million, respectively. 

Intuitive Surgical da Vinci System Leasing

Since 2013, we have entered into sales-type and operating lease arrangements directly with certain qualified customers as a way to offer customers flexibility in how they acquire da Vinci Surgical Systems and expand da Vinci Surgery availability while leveraging our balance sheet. The leases generally have commercially competitive terms as compared with other third party entities that offer equipment leasing. We include both operating and sales-type leases in our system shipment and installed base disclosures. We exclude operating leases from our system average selling prices computations.

In the years ended December 31, 2017, 2016, and 2015, we shipped 139, 95, and 63 systems under lease arrangements, respectively, of which 108, 62, and 43 were classified as operating leases, respectively. Generally, the operating lease arrangements provide our customers with the right to purchase the leased system sometime during and/or at the end of the lease term. Revenue generated from customer purchases of systems under operating lease arrangements (“Lease Buyouts”) was $39.5 million, $38.2 million, and $9.4 million for the years ended December 31, 2017, 2016, and 2015, respectively. We expect that revenue recognized from customer exercises of the buyout options will fluctuate based on the timing of when, and if, customers choose to exercise their buyout options. We believe our leasing program has been effective and well-received, and we are willing to expand it based on customer demand, including offering more flexible options such as variable lease payments.

Systems Revenue

System placements are driven by procedure growth in most markets. In geographies where da Vinciprocedure adoption is in an early stage, system sales will precede procedure growth. System placements also vary quarter to quarter due to seasonality. System revenue grew 16% to $928.4 million in 2017; 11% to $800.0 million in 2016; and 14% to $721.9 million in 2015. System revenue is also affected by the proportion of systems placed that are under operating lease arrangements, recurring operating lease revenue, operating lease buyouts, product mix, average selling prices (“ASPs”), and trade-in activities.

Procedure Mix / Products

Our da Vinci Surgical Systems are generally used for soft tissue surgery for areas of the body between the pelvis and the neck, primarily in general surgery, gynecologic surgery, urologic surgery, cardiothoracic surgery, and head and neck surgery. Within these categories, procedures range in complexity from cancer and other highly complex procedures down to less complex procedures for benign conditions. Cancer and other highly complex procedures tend to be reimbursed at higher rates than less complex procedures for benign conditions. Thus, hospitals are more sensitive to the costs associated with treating less complex benign conditions. Our strategy is to provide hospitals with attractive clinical and economic solutions in each of these procedure categories. Our fully featured da Vinci Xi Surgical System with advanced instruments, including the EndoWrist Vessel Sealer, EndoWrist Stapler products, and our Table Motion product target the more complex procedure segment. Lower priced products, including the three-arm da Vinci Si-e Surgical System, refurbished da Vinci Si Surgical System, and Single-Site instruments, are targeted towards less complex procedures. Our da Vinci X Surgical System is priced between the da Vinci Si and Xi Surgical Systems and offers customers access to many of the da Vinci Xi features, including da Vinci Xi advanced instrumentation and imaging systems, at a lower price point.

Procedure Seasonality

More than half of da Vinci procedures performed are for benign conditions, most notably benign hysterectomies, hernia repairs, and cholecystectomies. Hysterectomies for benign conditions, hernia repairs, cholecystectomies, and other short-term elective procedures tend to be more seasonal than cancer operations and surgeries for other life threatening conditions. Seasonality in the U.S. for these procedures for benign conditions typically results in higher fourth quarter procedure volume when more patients have met annual deductibles and lower first quarter procedure volume when deductibles are reset. Seasonality outside the U.S. varies and is more pronounced around local holidays and vacation periods.

Distribution Channels

We provide our products through direct sales organizations in the U.S., Japan, South Korea, and Europe, excluding Spain, Portugal, Italy, Greece, and Eastern European countries. In May 2018, we terminated our India distribution relationship with Vattikuti Technologies Pvt. Ltd. and acquired certain assets related to the distribution business. We accounted for the transaction

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as a business combination under U.S. GAAP. We established Intuitive Surgical India Private Limited, headquartered in Bangalore, India and began direct operations at the end of May. In the remainder of our OUS markets, we provide our products through distributors.

Regulatory Activities

Clearances and Approvals

We have obtained the clearances required to market our multi-port products associated with all of our da Vinci Surgical Systems (Standard, S, Si, Xi, and X systems) for our targeted surgical specialties within the U.S., South Korea, and the European markets in which we operate.

In July 2018, we received U.S. FDA clearance to market SureForm 60, our da Vinci EndoWrist 60mm Stapler (see the description of the SureForm 60mm in the New Product Introductions section below).

In April 2018, we received U.S. FDA clearance for our Vessel Sealer Extend (see the description of the Vessel Sealer Extend in the New Product Introductions section below).

We obtained the initial U.S. FDA clearance in April 2014 for our da Vinci SP Surgical System (see the description of the da Vinci SP Surgical System in the New Product Introductions section below), and since then we invested in important platform refinements. In May 2018, we obtained a new U.S. FDA clearance for the da Vinci SP Surgical System for urologic surgical procedures that are appropriate for a single port approach. We plan to launch the da Vinci SP Surgical System in the U.S. in a measured fashion, with customer shipments expected to begin in the second half of 2018. We also received regulatory clearance for the da Vinci SP Surgical System in South Korea in May 2018.

In April 2017, we received CE mark clearance for our da Vinci X Surgical System in Europe. Following the CE mark, in May 2017, we received U.S. FDA clearance to market our da Vinci X Surgical System in the U.S. We received regulatory clearance for the da Vinci X Surgical System in South Korea in September 2017 and in Japan in April 2018 (see the description of the da Vinci X Surgical System in the New Product Introductions section below). Regulatory clearances for da Vinci X Surgical System may be received in other markets over time.

The Japanese Ministry of Health, Labor, and Welfare (“MHLW”) considers reimbursement for procedures in April of every even year. The process for obtaining reimbursement requires Japanese university hospitals and surgical societies, with our support, to seek reimbursement. There are multiple pathways to obtain reimbursement for procedures, including those that require in-country clinical data/economic data. An additional 12 da Vinci procedures were granted reimbursement effective April 1, 2018, including gastrectomy, anterior resection, lobectomy and hysterectomy, for both malignant and benign conditions. These additional 12 reimbursed procedures have varying levels of conventional laparoscopic penetration and will be reimbursed at rates equal to the conventional laparoscopic procedures. Given the reimbursement level and laparoscopic penetration for these procedures, there can be no assurance that adoption will occur or, that the adoption pace for these procedures will be similar to any other da Vinciprocedure. If these procedures are not adopted and we are not successful in obtaining adequate procedure reimbursements for additional procedures, then the demand for our products in Japan could be limited.

Recalls and Corrections

Medical device companies have regulatory obligations to correct or remove medical devices in the field that could pose a risk to health. The definition of “recalls and corrections” is expansive and includes repair, replacement, inspections, relabeling, and issuance of new or additional instructions for use or reinforcement of existing instructions for use and training when such actions are taken for specific reasons of safety or compliance. These field actions require stringent documentation, reporting, and monitoring worldwide. There are other actions a medical device manufacturer may take in the field without reporting, including but not limited to, routine servicing and stock rotations.

As we determine whether a field action is reportable in any regulatory jurisdiction, we prepare and submit notifications to the appropriate regulatory agency for the particular jurisdiction. Regulators can require the expansion, reclassification, or change in scope and language of the field action. In general, upon submitting required notifications to regulators regarding a field action which is a recall or correction, we will notify customers regarding the field action, provide any additional documentation required in their national language, and arrange, as required, return or replacement of the affected product or a field service visit to perform the correction.

Field actions as well as certain outcomes from regulatory activities can result in adverse effects on our business, including damage to our reputation, delays by customers of purchase decisions, reduction or stoppage of the use of installed systems, and reduced revenue as well as increased expenses.

Procedures

We model patient value as equal to procedure efficacy / invasiveness. In this equation procedure efficacy is defined as a measure of the success of the surgery in resolving the underlying disease and invasiveness is defined as a measure of patient pain

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and disruption of regular activities. When the patient value of a da Vinci procedure is greater than that of alternative treatment options, patients may benefit from seeking out surgeons and hospitals that offer da Vinci Surgery, which could potentially result in a local market share shift. Da Vinci procedure adoption occurs procedure by procedure, market by market, and is driven by the relative patient value and total treatment costs of da Vinci procedures as compared to alternative treatment options for the same disease state or condition.

Worldwide Procedures

Da Vinci systems and instruments are regulated independently in various countries and regions of the world. The discussion of indications for use and representative or target procedures is intended solely to provide an understanding of the market for da Vinci products and is not intended to promote for sale or use any Intuitive Surgical product outside of its licensed or cleared labeling and indications for use.

The adoption of da Vinci Surgery has the potential to grow for those procedures that offer greater patient value than non-da Vinci alternatives, within the prevailing economics of healthcare providers. Da Vinci Surgical Systems are used primarily in gynecologic surgery, general surgery, urologic surgery, cardiothoracic surgery, and head and neck surgery. We focus our organization and investments on developing, marketing, and training for those products and targeted procedures where da Vinci can bring patient value relative to alternative treatment options and/or economic benefit to healthcare providers. Target procedures in gynecology include da Vinci Hysterectomy (“dVH”), for both cancer and benign conditions, and sacrocolpopexy. Target procedures in general surgery include hernia repair (both ventral and inguinal) and colorectal procedures. Target procedures in urology include dVP and partial nephrectomy. In cardiothoracic surgery, target procedures include da Vinci Lobectomy and da VinciMitral Valve Repair. In head and neck surgery, target procedures include certain procedures resecting benign and malignant tumors classified as T1 and T2. Not all the indications, procedures, or products described may be available in a given country or region or on all generations of da Vinci Surgical Systems. Patients need to consult the product labeling in their specific country and for each product in order to determine the actual authorized uses, as well as important limitations, restrictions, or contraindications.

In 2017, approximately 877,000 surgical procedures were performed with the da Vinci Surgical Systems, compared with approximately 753,000 and 652,000 procedures performed in 2016 and 2015, respectively. The growth in our overall procedure volume in 2017 was driven by growth in U.S. general surgery procedures and worldwide urologic procedures.

U.S. Procedures

Overall U.S. procedure volume grew to approximately 644,000 in 2017, compared with approximately 563,000 in 2016 and approximately 499,000 in 2015. For 2017, general surgery was our fastest growing specialty in the U.S. with procedure volume that grew to approximately 246,000 in 2017, compared with approximately 186,000 in 2016 and 140,000 in 2015, and the second largest in procedure volume. For 2017, gynecology was our largest U.S. surgical specialty and the procedure volume was approximately 252,000 in 2017, compared with 246,000 in 2016 and 238,000 in 2015. U.S. urology procedure volume was approximately 118,000 in 2017, compared with approximately 109,000 in 2016 and 102,000 in 2015.

Procedures Outside of the U.S.

Overall OUS procedures grew to approximately 233,000 in 2017, compared with approximately 190,000 in 2016 and approximately 153,000 in 2015. Procedure growth in most OUS markets was driven largely by urology procedure volume, which grew to approximately 149,000 in 2017, compared with approximately 124,000 in 2016 and approximately 102,000 in 2015. General surgery and gynecologic oncology procedures also contributed to OUS procedure growth.

Recent Business Events and Trends

Procedures

Overall. Total da Vinci procedures grew approximately 17% for the six months ended June 30, 2018, compared with 17% for the six months ended June 30, 2017. U.S. procedure growth was approximately 16% for the six months ended June 30, 2018, compared with 14% for the six months ended June 30, 2017. First half 2018 U.S. procedure growth was largely attributable to growth in general surgery procedures, most notably hernia repair, colorectal and bariatric procedures, and thoracic procedures, as well as moderate growth in more mature gynecologic and urologic procedure categories.

Procedure volume OUS grew approximately 20% for the six months ended June 30, 2018, compared with 25% for the six months ended June 30, 2017. First half 2018 OUS procedure growth was driven by continued growth in dVP procedures and earlier stage growth in general surgery, gynecology, and kidney cancer procedures. We believe growth in these global markets is being driven by increased acceptance among surgeons and health systems, supported by expanded global evidence validating the clinical and economic value of da Vinci procedures. The growth rate for the six months ended June 30, 2018 was lower than the previous year primarily due to lower procedure growth in China. Procedure growth in China moderated as da Vinci system capacity expansion is constrained by system quota requirements, the most recent of which expired at the end of 2015.

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U.S. Gynecology. Growth in gynecology procedures during the first half of 2018, continued at a rate consistent with 2017. Combining robotic, laparoscopic, and vaginal approaches, MIS represents about 80% of the U.S. hysterectomy market for benign conditions. We believe that our modest growth in gynecologic procedures over the past several years was primarily driven by consolidation of surgical volumes into surgeons that focus on cancer and complex surgeries.

U.S. General Surgery. Growth in general surgery procedures during the first half of 2018, continued to drive the majority of incremental procedures. The first half of 2018 growth in U.S. general surgery procedures was primarily driven by ventral and inguinal hernia procedures, as it did in 2017 and 2016. We believe that growth in da Vinci hernia repair reflects improved clinical outcomes within certain patient populations, as well as potential cost benefits relative to certain alternative treatments. We believe hernia repair procedures represent a significant opportunity with the potential to drive growth in future periods. However, given the differences in complexity among hernia patient populations and varying surgeon opinion regarding optimal surgical technique, it is difficult to estimate the timing of and to what extent da Vinci hernia repair procedure volume will grow in the future. We expect a large portion of hernia repairs will continue to be performed via different modalities of surgery.

Adoption of da Vinci for colorectal procedures, which includes several underlying procedures including low anterior resections for rectal cancers and certain colon procedures for benign and cancerous conditions, has been ongoing for several years, and is supported by our recently launched technologies such as the da Vinci XiSurgical System, EndoWrist Stapler, EndoWrist Vessel Sealer, and Integrated Table Motion.

Global Urology. Along with U.S. general surgery, global urology procedures drove our recent procedure growth. Da Vinci Prostatectomy (“dVP”) is the largest urology procedure in the U.S. First half 2018 growth in U.S. dVP procedures moderated slightly compared with 2017. We believe our growth in U.S. prostatectomy is largely aligned with surgical volumes of prostate cancer as dVP is the U.S. standard of care for the surgical treatment of prostate cancer. dVP is the largest overall OUS procedure. First half 2018 growth in OUS dVP continued to be solid. OUS dVP is at various stages of adoption in different areas of the world.

Kidney cancer procedures have also been a strong contributor to our recent global urology procedure growth. Clinical publications have demonstrated that the use of a da Vinci system in a hospital or market increases the likelihood that a patient will receive nephron sparing surgery through a partial nephrectomy, which is typically surgical society guideline-recommended therapy.

OUS Procedures. First half 2018 OUS procedure growth rate reflects continued da Vinci adoption in European and Asian markets. Procedure growth moderated in Asia and Europe. In China, we have experienced strong procedure growth and utilization on systems sold under our previous public hospital quota which expired at the end of 2015. However, procedure growth is now moderating as we are dependent on obtaining additional importation authorizations or public hospital quotas, as well as on hospitals completing a central purchasing tender process under such authorizations. The timing and magnitude of future authorizations that may enable future system placements in China is not certain. In Japan, we have experienced strong procedure growth since receiving the national reimbursements, outlined above, for dVP and partial nephrectomy. However, as adoption for these procedures has progressed, procedure growth in Japan has slowed. A total of 12 additional da Vinciprocedures were granted national reimbursement status effective April 1, 2018, including gastrectomy, anterior resection, lobectomy and hysterectomy, for both malignant and benign conditions. These additional 12 reimbursed procedures have varying levels of conventional laparoscopic penetration and will be reimbursed at rates equal to the conventional laparoscopic procedures. Given the reimbursement level and laparoscopic penetration for these procedures, there can be no assurance that adoption will occur or that the adoption pace for these procedures will be similar to any other da Vinci procedure. If these procedures do not adopt and we are not successful in obtaining adequate procedure reimbursement for additional procedures, then the demand for our products in Japan could be limited.

System Demand

Future demand for da Vinci Surgical Systems will be impacted by factors including hospital response to the evolving health care environment, procedure growth rates, hospital consolidation trends, evolving system utilization and point of care dynamics, capital replacement trends, additional reimbursements in various global markets, including Japan, the timing around governmental tenders and authorizations, including China, the timing of when we receive regulatory clearance in our other OUS markets for our Xi Surgical System, X Surgical System, and related instruments as well as other economic and geopolitical factors. Market acceptance of our recently launched X Surgical System may also impact future systems placement. Demand may also be impacted by robotic surgery competition, including from companies that have introduced products in the field of robotic surgery or have made explicit statements about their efforts to enter the field, including but not limited to: Auris Surgical Robotics, Inc.; Avatera Medical GmbH; Cambridge Medical Robotics Ltd.; Johnson & Johnson and Google Inc. and their joint venture, Verb Surgical Inc.; Medicaroid Inc.; MedRobotics Corp.; Medtronic PLC.; meerecompany Inc.; Olympus Corp.; Samsung Corporation; Smart Robot Technology Group Co. Ltd.; Titan Medical, Inc.; TransEnterix, Inc.; and Wego Holding Co., Ltd.

New Product Introductions

Da Vinci SP Surgical System. In May 2018, we obtained U.S. FDA clearance for the da Vinci SP Surgical System for urologic surgical procedures that are appropriate for a single port approach. The da Vinci SP system includes three, multi-jointed, wristed instruments and the first da Vinci fully wristed 3-D HD camera. The instruments and the camera all emerge through a single

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cannula and are triangulated around the target anatomy to avoid external instrument collisions that can occur in narrow surgical workspaces. The system enables flexible port placement and broad internal and external range of motion (e.g., 360-degrees of anatomical access) through the single SP arm. Surgeons control the fully articulating instruments and the camera on the da Vinci SP system, which will use the same fourth generation surgeon console as the da Vinci X and Xi systems. The da Vinci SP system provides surgeons with robotic-assisted technology designed for deep and narrow access to tissue in the body. We anticipate pursuing further regulatory clearances for da Vinci SP, including transoral and transanal applications, broadening the applicability of the SP platform over time. We plan to launch the da Vinci SP Surgical System in the U.S. in a measured fashion, with customer shipments expected to begin in the second half of 2018.

Da Vinci X Surgical System.In May 2017, we launched a new da Vinci model, the da Vinci X, in the U.S and Europe. Da Vinci X has also since been cleared in some other key markets including most recently Japan in April 2018. The da Vinci X system provides surgeons and hospitals with access to some of the most advanced robotic-assisted surgery technology at a lower cost. The da Vinci X uses the same vision cart and surgeon console that are found on our flagship product, the da Vinci Xi system, giving our customers the option of adding advanced capabilities, and providing a pathway for upgrading should they choose to do so as their practices and needs grow.

The da Vinci X enables optimized, focused-quadrant surgery including procedures like prostatectomy, hernia repair, and benign hysterectomy, among others. The system features flexible port placement and 3-D digital optics, while incorporating the same advanced instruments and accessories as the da Vinci Xi. The new system drives operational efficiencies through set-up technology that uses voice and laser guidance, drape design that simplifies surgery preparations, and a lightweight, fully integrated endoscope.

Da Vinci Xi Integrated Table Motion. In January 2016, we launched Integrated Table Motion in the U.S. Integrated Table Motion coordinates the movements of the da Vinci robot arms with an advanced operating room table, the TruSystem^® 7000dV sold by Trumpf Medical^TM, to enable shifting a patient’s position in real-time while the da Vinci surgical robotic arms remain docked. This gives operating room teams the capabilities to optimally position the operating table so that gravity exposes anatomy during multi-quadrant da Vinci System procedures, maximize reach and access to target anatomy enabling surgeons to interact with tissue at an ideal working angle, and reposition the table during the procedure to enhance anesthesiologists’ care of the patient.

SureForm 60 Stapler. In July 2018, we received U.S. FDA clearance in the U.S. for SureForm 60 instrument with Blue, Green, White, and Black 60mm reloads. The SureForm 60, is a single-use, fully wristed, stapling instrument intended for resection, transection, and/or creation of anastomoses, with particular utility in bariatric procedures. SureForm 60 broadens our existing stapler product line which also includes EndoWrist Stapler 45 with Blue, Green, and White 45mm reloads and EndoWrist 30 with Blue, Green, White, and Gray 30mm reloads. Not all reloads or staplers are available for use on all systems or in all countries.

Vessel Sealer Extend. In April 2018, we received U.S. FDA clearance for Vessel Sealer Extend, our newest line extension in the Vessel Sealing family of products. Vessel Sealer Extend is a single-use, fully wristed bipolar electrosurgical instrument compatible with our fourth generation multiport systems. It is intended for grasping and blunt dissection of tissue and for bipolar coagulation and mechanical transection of vessels up to 7mm in diameter and tissue bundles that fit in the jaws of the instrument.

Intuitive Surgical-Fosun Medical Technology (Shanghai) Co., Ltd.

In September 2016, we agreed to establish a joint venture with Shanghai Fosun Pharmaceutical (Group) Co., Ltd. (“Fosun Pharma”), a subsidiary of Fosun International Limited, to research, develop, manufacture, and sell robotic-assisted catheter-based medical devices. The catheter-based technology will initially target early diagnosis and cost-effective treatment of lung cancer, one of the most commonly diagnosed forms of cancer in the world. The technology will be used in robotic-assisted medical devices based on catheters and incorporates proprietary intellectual property developed or owned by us. The joint venture is located in Shanghai, China, where it will perform research and development activities and manufacture catheter-based products for global distribution. Distribution in China will be conducted by the joint venture, while distribution outside of China will be conducted by us. The joint venture is owned 60% by us and 40% by Fosun Pharma. As of June 30, 2018, the companies have contributed $25 million of up to $100 million required by the joint venture. Since 2011, Chindex Medical Limited, a subsidiary of Fosun Pharma, has been our distribution partner for da Vinci Surgical Systems in China.

In the second quarter of 2017, the joint venture company was legally formed. The joint venture received contributions from both parties and has been hiring employees and planning for the establishment of manufacturing infrastructure. For the three and six months ended June 30, 2018, the net loss attributable to the noncontrolling interest in the joint venture was $0.7 million and $1.0 million, respectively. We expect that the joint venture will incur net losses prior to product commercialization and during ramp-up periods after commercialization. We do not expect the joint venture to generate any revenue in 2018. Further, there can be no assurance that we and the joint venture can successfully complete the development of the robotic-assisted catheter-based medical devices; that we and the joint venture will successfully commercialize such products; that the joint venture will not require additional contributions to fund its business; or that the joint venture will become profitable.

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Second Quarter 2018 Financial Highlights

• Total revenue increased by 20% to $909.3 million during the three months ended June 30, 2018, compared with $758.8 million during the three months ended June 30, 2017.

• Approximately 257,000da Vinci procedures were performed during the three months ended June 30, 2018, an increase of approximately 18% compared with approximately 217,000 for the three months ended June 30, 2017.

• Instrument and accessory revenue increased by 20% to $476.1 million during the three months ended June 30, 2018, compared with $397.8 million during the three months ended June 30, 2017.

• Systems revenue increased by 25% to $277.4 million during the three months ended June 30, 2018, compared with $221.1 million during the three months ended June 30, 2017.

• A total of 220 da Vinci Surgical Systems were shipped during the three months ended June 30, 2018, compared with 166 during the three months ended June 30, 2017. As of June 30, 2018, we had a da Vinci Surgical System installed base of approximately 4,666 systems, an increase of approximately 12% compared with the installed base as of June 30, 2017.

• Gross profit as a percentage of revenue was 69.5% for the three months ended June 30, 2018, compared with 69.9% for the three months ended June 30, 2017.

• Operating income increased by 7% to $277.4 million during the three months ended June 30, 2018, compared with $259.9 million during the three months ended June 30, 2017. Operating income for the three months ended June 30, 2018, included pre-tax litigation related charges of $42.5 million. Operating income for the three months ended June 30, 2017, included pre-tax litigation recoveries of $4.5 million. Operating income included $63.6 million and $50.6 million of share-based compensation expense related to employee stock plans during the three months ended June 30, 2018, and 2017, respectively.

• As of June 30, 2018, we had $4.3 billion in cash, cash equivalents, and investments. Cash, cash equivalents, and investments increased by $413.1 million, compared with December 31, 2017, primarily as a result of cash generated from operating activities.

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Results of Operations

We adopted ASC 606, Revenue from Contracts with Customers, effective January 1, 2018, using the full retrospective method. The 2017 financial results presented below have been restated to reflect this adoption. Refer to “Note 2. Summary of Significant Accounting Policies” within Part I, Item 1 of this Form 10-Q for further discussion.

The following table sets forth, for the periods indicated, certain unaudited Condensed Consolidated Statements of Income information (in millions, except percentages):

	Three Months Ended June 30,									Six Months Ended June 30,
	2018			% of total revenue		2017		% of total revenue		2018			% of total revenue		2017		% of total revenue
Revenue:
Product	$	753.5		83	%	$	618.9	82	%	$	1,448.3		82	%	$	1,160.5	81	%
Service	155.8			17	%	139.9		18	%	308.5			18	%	277.9		19	%
Total revenue	909.3			100	%	758.8		100	%	1,756.8			100	%	1,438.4		100	%
Cost of revenue:
Product	228.1			25	%	184.7		24	%	429.6			24	%	350.2		24	%
Service	48.9			5	%	44.0		6	%	101.1			6	%	88.3		6	%
Total cost of revenue	277.0			30	%	228.7		30	%	530.7			30	%	438.5		30	%
Product gross profit	525.4			58	%	434.2		58	%	1,018.7			58	%	810.3		57	%
Service gross profit	106.9			12	%	95.9		12	%	207.4			12	%	189.6		13	%
Gross profit	632.3			70	%	530.1		70	%	1,226.1			70	%	999.9		70	%
Operating expenses:
Selling, general and administrative	259.8			29	%	185.6		24	%	481.4			27	%	388.5		27	%
Research and development	95.1			10	%	84.6		11	%	190.6			11	%	158.1		11	%
Total operating expenses	354.9			39	%	270.2		35	%	672.0			38	%	546.6		38	%
Income from operations	277.4			31	%	259.9		35	%	554.1			32	%	453.3		32	%
Interest and other income, net	18.2			2	%	10.1		1	%	31.4			1	%	18.8		1	%
Income before taxes	295.6			33	%	270.0		36	%	585.5			33	%	472.1		33	%
Income tax expense	41.0			5	%	47.0		7	%	43.6			2	%	68.3		5	%
Net income	254.6			28	%	223.0		29	%	541.9			31	%	403.8		28	%
Less: net loss attributable to noncontrolling interest	(0.7		)	—	%	—		—	%	(1.0		)	—	%	—		—	%
Net income attributable to Intuitive Surgical, Inc.	$	255.3		28	%	$	223.0	29	%	$	542.9		31	%	$	403.8	28	%

Total Revenue

Total revenue was $909.3 million for the three months ended June 30, 2018, compared with $758.8 million for the three months ended June 30, 2017, resulting from 20% higher instrument and accessory revenue driven by approximately 18% higher procedure volume, 25% higher systems revenue, and 11% higher service revenue.

Revenue denominated in foreign currencies as a percentage of total revenue was approximately 19% and 20% for the three and six months ended June 30, 2018, respectively, and 17% for the three and six months ended June 30, 2017. We sell our products and services in local currencies where we have direct distribution channels. The impact of the weaker U.S. dollar during the three months ended June 30, 2018, contributed approximately one percentage point to second quarter 2018 revenue growth.

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Revenue generated in the U.S. accounted for 71% and 69% of total revenue for the three and six months ended June 30, 2018, respectively, and 73% of total revenue for both the three and six months ended June 30, 2017. We believe that U.S. revenue has accounted for the large majority of total revenue due to U.S. patients’ ability to choose their provider and method of treatment, reimbursement structures supportive of innovation and minimally invasive surgery, and initial investments focused on U.S. infrastructure. We have been investing in our business in the OUS markets and our OUS procedures have grown faster in proportion to U.S. procedures. We expect that our OUS procedures and revenue will make up a greater portion of our business in the long term.

The following table summarizes our revenue and da Vinci Surgical System unit shipments for the three and six months ended June 30, 2018, and 2017, respectively (in millions, except percentages and unit shipments):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Revenue
Instruments and accessories	$	476.1		$	397.8		$	936.4		$	778.6
Systems	277.4			221.1			511.9			381.9
Total product revenue	753.5			618.9			1,448.3			1,160.5
Services	155.8			139.9			308.5			277.9
Total revenue	$	909.3		$	758.8		$	1,756.8		$	1,438.4
United States	$	644.7		$	552.6		$	1,217.1		$	1,047.4
OUS	264.6			206.2			539.7			391.0
Total revenue	$	909.3		$	758.8		$	1,756.8		$	1,438.4
% of Revenue - U.S.	71		%	73		%	69		%	73		%
% of Revenue - OUS	29		%	27		%	31		%	27		%
Instruments and accessories	$	476.1		$	397.8		$	936.4		$	778.6
Services	155.8			139.9			308.5			277.9
Operating lease revenue	11.5			6.4			21.0			11.4
Total recurring revenue	$	643.4		$	544.1		$	1,265.9		$	1,067.9
% of Total revenue	71		%	72		%	72		%	74		%
Unit Shipments by Region:
U.S. unit shipments	138			103			250			180
OUS unit shipments	82			63			155			119
Total unit shipments*	220			166			405			299
*Systems shipped under operating leases (included in total unit shipments)	44			27			87			48
Unit Shipments involving System Trade-ins:
Unit shipments involving trade-ins	74			34			131			62
Unit shipments not involving trade-ins	146			132			274			237

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Product Revenue

Three months ended June 30, 2018

Product revenue increased by 22% to $753.5 million for the three months ended June 30, 2018, compared with $618.9 million for the three months ended June 30, 2017.

Instrument and accessory revenue increased by 20% to $476.1 million for the three months ended June 30, 2018, compared with $397.8 million for the three months ended June 30, 2017. The increase in instrument and accessory revenue was driven by procedure growth of approximately 18%, higher sales of our advanced instruments, and partially offset by timing of customer orders. Second quarter 2018 U.S. procedure growth of approximately 17% was driven by growth in general surgery procedures, most notably hernia repair, colorectal and bariatric procedures, thoracic procedures, and a moderate growth in the more mature gynecologic and urologic procedures categories. OUS procedure growth was approximately 22% for the second quarter of 2018, and was driven by continued growth in dVP procedures, earlier stage growth in general surgery, gynecology, and kidney cancer procedures. Geographically, second quarter 2018 OUS procedure growth was driven by procedure expansion in Japan, China, and South Korea. Procedure growth varied by country in our European markets.

Systems revenue increased by 25% to $277.4 million for the three months ended June 30, 2018, compared with $221.1 million for the three months ended June 30, 2017. Higher second quarter 2018 systems revenue was primarily driven by higher system shipments, and higher systems leasing related revenue, partly offset by a higher number of system placements under operating lease arrangements and lower system ASP. Revenue from Lease Buyouts was $12.5 million for the three months ended June 30, 2018, compared with $5.2 million for the three months ended June 30, 2017. We expect revenue from Lease Buyouts to fluctuate period to period based on the timing of when, and if, customers choose to exercise the buyout options embedded in their leases.

During thesecond quarterof2018, a total of 220 systems were shipped compared with 166 during the second quarter of 2017. By geography, 138 systems were shipped into the U.S., 39 into Europe, 23 into Asia, and 20 into other markets during the second quarter of 2018, compared with 103 systems shipped into the U.S., 29 into Europe, 25 into Asia, and 9 into other markets during the second quarter of 2017. We shipped 52 and 35 systems under lease arrangements, of which 44 and 27 were classified as operating leases, in the three months ended June 30, 2018, and 2017, respectively. Operating lease revenue was $11.5 million for the three months ended June 30, 2018, compared with $6.4 million for the three months ended June 30, 2017. A total 231 of da VinciSurgical Systems were installed at customers under operating lease arrangements as of June 30, 2018. The increase in systems shipments was primarily driven by procedure growth and the need for hospitals to expand or establish capacity.

The da Vinci Surgical System ASP, excluding the impact of systems shipped under operating leases, was approximately $1.42 million for the three months ended June 30, 2018, compared with $1.46 million for the three months ended June 30, 2017. The lower second quarter 2018 ASP primarily reflects a higher proportion of system transactions involving a trade-in as well as product mix. ASPs fluctuate from period to period based on geographic and product mix, product pricing, systems shipped involving trade-ins, and changes in foreign exchange rates.

Six months ended June 30, 2018

Product revenue increased by 25% to $1.4 billion for the six months ended June 30, 2018, compared with $1.2 billion for the six months ended June 30, 2017.

Instrument and accessory revenue increased by 20% to $936.4 million for the six months ended June 30, 2018, compared with $778.6 million for the six months ended June 30, 2017. The increase in instrument and accessory revenue was driven by procedure growth of approximately 17% and higher sales of our advanced instruments, and favorable foreign currency impact. First half 2018 U.S. procedure growth of approximately 16% was driven by growth in general surgery procedures, most notably hernia repair, colorectal and bariatric procedures, thoracic procedures, as well as moderate growth in more mature gynecologic and urologic procedure categories. OUS procedure growth was approximately 20% for the six months ended June 30, 2018, driven by continued growth in dVP procedures and earlier stage growth in general surgery, gynecology, and kidney cancer procedures. Geographically, higher first half 2018 OUS procedure growth was driven by procedure expansion in Japan, China, and South Korea. Procedure growth varied by country in our European markets.

Systems revenue increased by 34% to $511.9 million for the six months ended June 30, 2018, compared with $381.9 million for the six months ended June 30, 2017. Higher first half 2018 systems revenue was driven primarily by higher system shipments, first half 2017 revenue deferral related to the da Vinci X trade out program, and higher lease related revenue, partly offset by a higher number of system placements under operating lease arrangements. In the first half of 2017, $23.4 million of revenue was deferred related to a customer trade-out program that we offered certain customers who purchased a surgical system in the first quarter of 2017.

During the six months ended June 30, 2018, a total of 405 systems were shipped compared with 299 during the six months ended June 30, 2017. By geography, 250 systems were shipped into the U.S., 84 into Europe, 39 into Asia, and 32 into other markets during the six months ended June 30, 2018, compared with 180 systems shipped into the U.S., 50 into Europe, 48 into

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Asia, and 21 into other markets during the six months ended June 30, 2017. During the six months ended June 30, 2018, 87 of the 405 systems were shipped under operating lease arrangements compared with 48 of 299 systems shipped during the six months ended June 30, 2017. Operating lease revenue was $21.0 million for the six months ended June 30, 2018, compared with $11.4 million for the six months ended June 30, 2017. The increase in systems shipments was primarily driven by procedure growth and the need for hospitals to expand or establish capacity.

The da Vinci Surgical System ASP, excluding the impact of systems shipped under operating leases, was approximately $1.45 million for the six months ended June 30, 2018, compared with $1.46 million for six months ended June 30, 2017. ASPs fluctuate period to period based on geographic and product mix, product pricing, systems shipped involving trade-ins, and changes in foreign exchange rates.

Service Revenue

Service revenue increased by 11% to $155.8 million for the three months ended June 30, 2018, compared with $139.9 million for the three months ended June 30, 2017. Service revenue increased by 11% to $308.5 million for the six months ended June 30, 2018, compared with $277.9 million for the six months ended June 30, 2017. Higher service revenue for the three and six months ended June 30, 2018, was primarily driven by a larger installed base of da Vinci Surgical Systems producing service revenue.

Gross Profit

Product gross profit for the three months ended June 30, 2018, increased 21% to $525.4 million, representing 69.7% of product revenue, compared with $434.2 million, representing 70.2% of product revenue, for the three months ended June 30, 2017. Product gross profit for the six months ended June 30, 2018, increased 26% to $1,018.7 million, representing 70.3% of product revenue, compared with $810.3 million, representing 69.8% of product revenue, for the six months ended June 30, 2017. The higher product gross profit for the three and six months ended June 30, 2018, was primarily driven by higher product revenue.

The lower product gross profit margin for the three months ended June 30, 2018, as compared with the same period in 2017, was primarily due to lower system ASP and product mix. The higher product gross margin for the six months ended June 30, 2018, as compared with the same period in 2017, was primarily due to a $7.8 million litigation settlement charge related to a license and supply agreement recognized in the first quarter of 2017.

Product gross profit for the three and six months ended June 30, 2018, reflected share-based compensation expense of $8.9 million and $17.1 million, respectively, compared with $6.7 million and $13.5 million for the three and six months ended June 30, 2017, respectively. Product gross profit for the three and six months ended June 30, 2018, included amortization expense of intangible assets of $1.3 million and $2.3 million, respectively, compared with $1.5 million and $3.2 million for the three and six months ended June 30, 2017, respectively.

Service gross profit for the three months ended June 30, 2018, was $106.9 million, or 68.6% of service revenue, compared with $95.9 million, or 68.5% of service revenue for the three months ended June 30, 2017. Service gross profit for the six months ended June 30, 2018, was $207.4 million, or 67.2% of service revenue, compared with $189.6 million, or 68.2% of service revenue for the six months ended June 30, 2017.

The higher service gross profit for the three and six months ended June 30, 2018, was driven by higher service revenue, reflecting a larger installed base of da Vinci Surgical Systems. Service gross profit margin for the three months ended June 30, 2018 remained consistent as compared with the same period in 2017. The lower service gross profit margin for the six months ended June 30, 2018, as compared with the same period in 2017, was primarily driven by higher costs to repair and replace da Vinci Xi/X endoscope products.

Service gross profit for the three and six months ended June 30, 2018, reflected share-based compensation expense of $4.1 million and $8.0 million, respectively, compared with $3.5 million and $6.7 million for the three and six months ended June 30, 2017, respectively.

Selling, General and Administrative Expenses

Selling, general and administrative expenses include costs for sales, marketing and administrative personnel, sales and marketing activities, tradeshow expenses, legal expenses, regulatory fees, and general corporate expenses.

Selling, general and administrative expenses for the three months ended June 30, 2018, increased by 40% to $259.8 million, compared with $185.6 million for the three months ended June 30, 2017. Selling, general and administrative expenses for the six months ended June 30, 2018, increased by 24% to $481.4 million, compared with $388.5 million for the six months ended June 30, 2017. The increase for the three and six months ended June 30, 2018, was mainly due to the $42.5 million litigation charge associated with reaching a settlement in principle relating to the Abrams class action lawsuit further described in Note 6 to the Condensed Consolidated Financial Statements (Unaudited) included in Part I, Item 1. Also the higher selling, general and administrative expenses for the three and six months ended June 30, 2018, were associated with our expanded Asian and European teams, and infrastructure to support our growth.

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Selling, general and administrative expenses for the three and six months ended June 30, 2018, included pre-tax litigation charges of $42.5 million and $47.7 million, respectively. Selling, general and administrative expenses for the three and six months ended June 30, 2017 include pre-tax litigation benefits of $4.5 million, primarily driven by product liability insurance recovery offset by other litigation charges, and litigation charges of $9.0 million, respectively.

Selling, general and administrative expenses for the three and six months ended June 30, 2018, reflected share-based compensation expense of $32.7 million and $62.2 million, respectively, compared with $26.6 million and $52.3 million for the three and six months ended June 30, 2017, respectively.

Research and Development Expenses

Research and development costs are expensed as incurred. Research and development expenses include costs associated with the design, development, testing, and significant enhancement of our products.

Research and development expenses for the three months ended June 30, 2018, increased by 12% to $95.1 million, compared with $84.6 million for the three months ended June 30, 2017. Research and development expenses for the six months ended June 30, 2018, increased by 21% to $190.6 million, compared with $158.1 million for the six months ended June 30, 2017. The increase was primarily due to higher personnel and other project costs to support a broader set of product development initiatives, including our da Vinci SPSurgical System; robotic-assisted catheter-based medical devices; advanced imaging and analytics; advanced instrumentation; and future generations of robotics. For the three months ended June 30, 2018, the increase was partly offset by higher expenses related to licensed intellectual property recorded for the three months ended June 30, 2017.

Share-based compensation expense charged to research and development expense was $17.9 million and $34.2 million for the three and six months ended June 30, 2018, respectively, compared with $13.8 million and $25.7 million for the three and six months ended June 30, 2017, respectively. Amortization expense related to intangible assets was $1.6 million and $3.2 million for the three and six months ended June 30, 2018, respectively, compared with $1.8 million and $3.8 million for the three and six months ended June 30, 2017.

Research and development expenses fluctuate with project timing. Based upon our broader set of product development initiatives and the stage of the underlying projects, we expect to continue to make substantial investments in research and development and anticipate that research and development expenses will continue to increase in the future.

Interest and Other Income, Net

Interest and other income, net, for the three and six months ended June 30, 2018, was $18.2 million and $31.4 million, respectively, compared with $10.1 million and $18.8 million for the three and six months ended June 30, 2017. The increase was primarily driven by higher interest earned during the three and six months ended June 30, 2018 due to higher interest rates and higher cash and investment balances.

Income Tax Expense

Income tax expense for the three months ended June 30, 2018, was $41.0 million, or 13.9% of income before taxes, compared with $47.0 million, or 17.4% of income before taxes, for the three months ended June 30, 2017. Income tax expense for the six months ended June 30, 2018, was $43.6 million, or 7.4% of income before taxes, compared with $68.3 million, or 14.5% of income before taxes for the six months ended June 30, 2017.

The lower effective tax rate for the three and six months ended June 30, 2018, compared with the same periods of 2017, were primarily due to the decrease of federal statutory tax rate from 35% to 21% as a result of the Tax Cuts and Jobs Act (“Tax Act”), higher excess tax benefits associated with employee equity plans, and higher federal R&D credit benefits, partially offset by higher taxes on certain foreign earnings. Our effective tax rate for the three months ended June 30, 2018, differed from the U.S. federal statutory rate of 21% primarily due to excess tax benefits associated with employee equity plans and federal R&D credit benefit, partially offset by state income taxes. Our effective tax rate for the three months ended June 30, 2017, differed from the U.S. federal statutory rate of 35% primarily due to excess tax benefits associated with employee equity plans, the effect of certain foreign earnings being taxed at rates lower than the federal statutory rate, and federal R&D credit benefit, partially offset by state income taxes.

In connection with the Tax Act enacted in December 2017, we recorded a provisional amount of $317.8 million within income tax expense for the year ended December 31, 2017. In accordance with relevant SEC guidance, the effects of the Tax Act may be adjusted within a one-year measurement period from the enactment date for items that were previously reported as provisional, or where a provisional estimate could not be made. Income tax provision for the three and six months ended June 30, 2018, did not reflect any adjustment to the previously assessed Tax Act enactment effect. Income tax expense for the three and six months ended June 30, 2018, reflected $6.4 million and $15.5 million, respectively, of estimated tax on global intangible low-taxed income enacted by the Tax Act. For the global intangible low-taxed income provisions of the Tax Act, we have not yet elected an accounting policy with respect to either recognize deferred taxes for basis differences expected to reverse as global intangible low-taxed income, or to record such as period costs if and when incurred. We will continue to assess forthcoming guidance and accounting

33

interpretations on the effects of the Tax Act and expect to complete the analysis within the measurement period in accordance with the SEC guidance. As a result of the Tax Act, the provisional amount recorded in December 2017 included a one-time deemed repatriation toll charge on the cumulative undistributed foreign earnings through 2017. In June 2018, we repatriated to the U.S. $1.6 billion of cumulative undistributed foreign earnings without significant incremental tax impact. We are still evaluating whether to change our indefinite reinvestment assertion for years after 2017 in light of the Tax Act. If we subsequently change our assertion during the measurement period, we will account for the change in assertion as part of the Tax Act enactment.

Our income tax provision is subject to volatility as the amount of excess tax benefits or deficiencies fluctuates from period to period based on the price of our stock, the volume of share-based instruments settled or vested, and the value assigned to employee equity awards under U.S. GAAP. Our provision for income taxes included excess tax benefits associated with employee equity plans of $21.6 million and $76.3 million, which reduced our effective tax rate by 7.3 percentage points and 13.0 percentage points, for the three and six months ended June 30, 2018, respectively.

We are subject to the examination of our income tax returns by the Internal Revenue Service and other tax authorities. The outcome of these audits cannot be predicted with certainty. Management regularly assesses the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of our provision for income taxes. If any issues addressed in our tax audits are resolved in a manner not consistent with management’s expectations, we could be required to adjust our provision for income taxes in the period such resolution occurs.

34

Liquidity and Capital Resources

Sources and Uses of Cash

Our principal source of liquidity is cash provided by operations and issuance of common stock through exercise of stock options and our employee stock purchase program. Cash and cash equivalents plus short- and long-term investments increased from $3.8 billion as of December 31, 2017, to $4.3 billion as of June 30, 2018, primarily from cash provided by our operations. Cash generation is one of our fundamental strengths and provides us with substantial financial flexibility in meeting our operating, investing, and financing needs.

As of June 30, 2018 and March 31, 2018, our foreign subsidiaries held a total of $214.1 million and $1,613.0 million, respectively, of cash, cash equivalents, and investments. As a result of the Tax Act, we can repatriate our cumulative undistributed foreign earnings to the U.S. with minimal additional tax impact. In the second quarter of 2018, we repatriated $1.4 billion of cash, cash equivalents, and investments held by our foreign subsidiaries without significant incremental tax impact. We are still evaluating whether to change our indefinite reinvestment assertion for years after 2017 in light of the Tax Act. If we subsequently change our assertion during the measurement period, we will account for the change in assertion as part of the Tax Act enactment. We believe the cash provided by our operations will meet our liquidity needs for the foreseeable future.

See “Item 7A. Quantitative and Qualitative Disclosures About Market Risk” on our Form 10-K for the fiscal year ended December 31, 2017 for discussion on the impact of interest rate risk and market risk on our investment portfolio.

Condensed Consolidated Cash Flow Data (Unaudited)

The following table summarizes our cash flows for the six months ended June 30, 2018, and 2017 (in millions):

	Six Months Ended   June 30,
	2018			2017
Net cash provided by (used in)
Operating activities	$	511.7		$	458.0
Investing activities	9.3			954.5
Financing activities	34.9			(1,753.6		)
Effect of exchange rates on cash, cash equivalents, and restricted cash	(0.6		)	1.0
Net increase (decrease) in cash, cash equivalents, and restricted cash	$	555.3		$	(340.1	)

Operating Activities

For the six months ended June 30, 2018, net cash provided by operating activities of $511.7 million differed from our net income of $541.9 million primarily for the following reasons:

1. Changes in operating assets and liabilities resulted in $265.2 million of cash used by operating activities. Operating assets and liabilities are primarily comprised of accounts receivable, inventory, prepaid expenses and other assets, deferred revenue, and other accrued liabilities. Inventory, including the transfer of equipment from inventory to property, plant and equipment, increased by $133.9 million. Prepaid expenses and other assets increased by $102.4 million primarily due to an increase in prepaid taxes driven by the timing of tax payments. Accrued compensation and employee benefits decreased by $39.6 million primarily due to the payments of 2017 incentive compensation. Accounts receivable increased $17.3 million primarily due to timing of customer billings and collections. Other liabilities decreased by $16.1 million primarily due to a decrease in income tax payable partly offset by an increase of litigation accrual. The unfavorable impact of these items on cash used by operating activities was partly offset by a $29.8 million increase in deferred revenue and a $14.3 million increase in accounts payable.

2. The cash used by operating activities resulted from changes in operating assets and liabilities were partly offset by the non-cash charges included in our net income: share-based compensation of $120.8 million; depreciation expense of $49.8 million; deferred income taxes of $48.7 million; amortization of intangible assets of $5.7 million; amortization of contract acquisition asset of $5.3 million; and investment related non-cash charges of $4.7 million.

Investing Activities

Net cash provided by investing activities during the six months ended June 30, 2018, consisted of proceeds from sales and maturities of investments (net of purchases of investments) of $132.3 million partly offset by the acquisition of property and equipment of $84.9 million and an acquisition of a business combination for $38.1 million. We invest predominantly in high quality, fixed income securities. Our investment portfolio may at any time contain investments in U.S. treasury and U.S. government agency securities, taxable and tax exempt municipal notes, corporate notes and bonds, commercial paper, non-U.S. government agency securities, cash deposits, and money market funds.

35

Financing Activities

Net cash provided by financing activities during the six months ended June 30, 2018, consisted primarily of $134.9 million of proceeds from stock option exercises and employee stock purchases partly offset by $108.0 million in taxes paid on behalf of employees related to net share settlements of vested employee equity awards.

Capital Expenditures

Our business is not capital intensive and we had no material commitments for capital expenditures as of the end of the second quarter of 2018.

Our cash requirements depend on numerous factors, including the market acceptance of our products, the resources we devote to developing and supporting our products, and other factors. In the past, we made substantial investments in our commercial operations, product development activities, facilities, and intellectual property. We expect to continue to devote substantial resources to expand our commercial operations, product development and manufacturing activities, our facilities, as well as procedure adoption and acceptance of our products. Based upon our business model, we anticipate that we will continue to be able to fund future growth through cash provided by our operations. We believe that our current cash, cash equivalents, and investment balances, together with income to be derived from the sale of our products, will be sufficient to meet our liquidity requirements for the foreseeable future.

Critical Accounting Policies and Estimates

The discussion and analysis of our financial condition and results of operations are based upon our Financial Statements, which have been prepared in accordance with U.S. GAAP. The preparation of these Financial Statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues, and expenses. On an ongoing basis, we evaluate our critical accounting policies and estimates. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. With the exception of the change in revenue recognition as a result of the adoption of ASC 606, there have been no new or material changes to the critical accounting policies and estimates discussed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017, that are of significance, or potential significance to the Company.

Revenue recognition. Our system sale arrangements contain multiple products and services, including system(s), system components, system accessories, instruments, accessories, and service. Other than service, we generally deliver all of the products upfront. Each of these products and services is a distinct performance obligation. System accessories, instruments, accessories, and service are also sold on a stand-alone basis.

For multiple-element arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price. Standalone selling prices are based on observable prices at which we separately sell the products or services. If a standalone selling price is not directly observable, then we estimate the standalone selling prices considering market conditions and entity-specific factors including, but not limited to, features and functionality of the products and services, geographies, type of customer, and market conditions. We regularly review standalone selling prices and maintain internal controls over establishing and updating these estimates.

Our system sales arrangements generally include a five-year period of service. The first year of service is generally free and included in the system sale arrangement and the remaining four years are at a stated service price. Revenue that is allocated to service obligation is deferred and recognized ratably over the service period.

36

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There have been no material changes in our market risk during the six months ended June 30, 2018, compared to the disclosures in Part II, Item 7A of our Annual Report on Form 10-K for the year ended December 31, 2017.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms and that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate, to allow for timely decisions regarding required disclosure.

As required by SEC Rule 13a-15(b), we carried out an evaluation, under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this report. Based on the foregoing, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control over Financial Reporting

There has been no change in our internal control over financial reporting that occurred during our most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

37

PART II - OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

The information included in Note 6 to the Condensed Consolidated Financial Statements (Unaudited) included in Part I, Item 1 of this quarterly report is incorporated herein by reference.

ITEM 1A. RISK FACTORS

You should carefully consider the factors discussed in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017, which could materially affect our business, financial position, or future results of operations. The risks described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017, are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial position, or future results of operations.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

There were no unregistered sales of equity securities during the period covered by this report.

(c) Issuer Purchases of Equity Securities

Since March 2009, we have had an active stock repurchase program. As of June 30, 2018, our Board of Directors (the “Board”) had authorized an aggregate amount of up to $6.2 billion for stock repurchases, of which the most recent authorization occurred in December 2016, when the Board increased the authorized amount available under our share repurchase program to $3.0 billion. No shares were purchased during the three months ended June 30, 2018. Approximately $717.5 million remained available to repurchase shares under the authorized repurchase program as of June 30, 2018. The authorized stock repurchase program does not have an expiration date.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

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ITEM 6. EXHIBITS

Exhibit Number	Exhibit Description
3.1	Amended and Restated Certificate of Incorporation of Intuitive Surgical, Inc., as amended (incorporated by reference to Exhibit 3.1 on Form 10-Q filed with the Securities and Exchange Commission on October 20, 2017).
3.2	Amended and Restated Bylaws of Intuitive Surgical, Inc. (incorporated by reference to Exhibit 3.1 of the Current Report on Form 8-K filed with the Securities and Exchange Commission on December 13, 2016).
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	The following materials from Intuitive Surgical, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2018, formatted in XBRL (Extensible Business Reporting Language): (i) the unaudited Condensed Consolidated Balance Sheets, (ii) the unaudited Condensed Consolidated Statements of Comprehensive Income, (iii) the unaudited Condensed Consolidated Statements of Cash Flows, and (iv) Notes to Condensed Consolidated Financial Statements (unaudited), tagged at Level I through IV.

39

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

INTUITIVE SURGICAL, INC.
By:	/s/ MARSHALL L. MOHR
	Marshall L. Mohr
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer and duly authorized signatory)

Date: July 20, 2018

40

EX-31.1

EXHIBIT 31.1

Certification of Chief Executive Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Gary S. Guthart, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Intuitive Surgical, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 20, 2018

By:	/S/ GARY S. GUTHART
	Gary S. Guthart, Ph.D. President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

Certification of Chief Financial Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Marshall L. Mohr, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Intuitive Surgical, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 20, 2018

By:	/S/ MARSHALL L. MOHR
	Marshall L. Mohr Executive Vice President and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

Certification of Chief Executive Officer

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned officer of Intuitive Surgical, Inc. (the “Company”) hereby certifies, to such officer’s knowledge, that:

(i) the accompanying Quarterly Report on Form 10-Q of the Company for the quarterly period ended June 30, 2018 (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: July 20, 2018

By:	/S/ GARY S. GUTHART
	Gary S. Guthart, Ph.D. President and Chief Executive Officer

EX-32.2

EXHIBIT 32.2

Certification of Chief Financial Officer

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned officer of Intuitive Surgical, Inc. (the “Company”) hereby certifies, to such officer’s knowledge, that:

(i) the accompanying Quarterly Report on Form 10-Q of the Company for the quarterly period ended June 30, 2018 (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: July 20, 2018

By:	/S/ MARSHALL L. MOHR
	Marshall L. Mohr Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 17, 2018
Document Document And Entity Information [Abstract]
Entity Registrant Name	INTUITIVE SURGICAL INC
Trading Symbol	ISRG
Entity Central Index Key	0001035267
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		113,747,594

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,203.5	$ 648.2
Short-term investments	1,729.0	1,312.4
Accounts receivable, net	532.5	507.9
Inventory	331.5	241.2
Prepaids and other current assets	189.6	99.2
Total current assets	3,986.1	2,808.9
Property, plant, and equipment, net	688.8	613.1
Long-term investments	1,327.1	1,885.9
Deferred tax assets	415.4	72.0
Intangible and other assets, net	221.3	195.8
Goodwill	210.9	201.1
Total assets	6,849.6	5,776.8
Current liabilities:
Accounts payable	102.2	82.5
Accrued compensation and employee benefits	128.0	167.6
Deferred revenue	272.1	243.8
Other accrued liabilities	164.1	168.9
Total current liabilities	666.4	662.8
Other long-term liabilities	314.0	333.6
Total liabilities	980.4	996.4
Contingencies (Note 6)
Stockholders’ equity:
Preferred stock, 2.5 shares authorized, $0.001 par value, issuable in series; no shares issued and outstanding as of June 30, 2018, and December 31, 2017	0.0	0.0
Common stock, 300.0 shares authorized, $0.001 par value, 113.7 shares and 112.3 shares issued and outstanding as of June 30, 2018, and December 31, 2017, respectively	0.1	0.1
Additional paid-in capital	4,928.8	4,679.2
Retained earnings	948.1	115.0
Accumulated other comprehensive loss	(16.4)	(15.5)
Total Intuitive Surgical, Inc. stockholders’ equity	5,860.6	4,778.8
Noncontrolling interest	8.6	1.6
Total stockholders’ equity	5,869.2	4,780.4
Total liabilities and stockholders’ equity	$ 6,849.6	$ 5,776.8

XML

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	2,500,000.0	2,500,000.0
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	300,000,000.0	300,000,000.0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares issued (in shares)	113,700,000	112,300,000
Common stock, shares outstanding (in shares)	113,700,000	112,300,000

XML

Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Product	$ 753.5	$ 618.9	$ 1,448.3	$ 1,160.5
Service	155.8	139.9	308.5	277.9
Total revenue	909.3	758.8	1,756.8	1,438.4
Cost of revenue:
Product	228.1	184.7	429.6	350.2
Service	48.9	44.0	101.1	88.3
Total cost of revenue	277.0	228.7	530.7	438.5
Gross profit	632.3	530.1	1,226.1	999.9
Operating expenses:
Selling, general and administrative	259.8	185.6	481.4	388.5
Research and development	95.1	84.6	190.6	158.1
Total operating expenses	354.9	270.2	672.0	546.6
Income from operations	277.4	259.9	554.1	453.3
Interest and other income, net	18.2	10.1	31.4	18.8
Income before taxes	295.6	270.0	585.5	472.1
Income tax expense	41.0	47.0	43.6	68.3
Net income	254.6	223.0	541.9	403.8
Less: net loss attributable to noncontrolling interest	(0.7)	0.0	(1.0)	0.0
Net income attributable to Intuitive Surgical, Inc.	$ 255.3	$ 223.0	$ 542.9	$ 403.8
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)	$ 2.25	$ 2.01	$ 4.80	$ 3.62
Diluted (in dollars per share)	$ 2.15	$ 1.94	$ 4.59	$ 3.50
Shares used in computing net income per share attributable to Intuitive Surgical, Inc.:
Basic (in shares)	113.5	111.0	113.2	111.6
Diluted (in shares)	118.5	115.2	118.3	115.5
Total comprehensive income attributable to Intuitive Surgical, Inc.	$ 257.0	$ 221.2	$ 542.0	$ 402.9

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Cash Flows [Abstract]
Net income	$ 541.9	$ 403.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and loss on disposal of property, plant, and equipment	49.8	39.6
Amortization of intangible assets	5.7	7.0
Loss on investments, accretion of discounts, and amortization of premiums on investments, net	4.7	11.4
Deferred income taxes	48.7	35.5
Share-based compensation expense	120.8	97.8
Amortization of contract acquisition asset	5.3	5.5
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	(17.3)	(51.4)
Inventory	(133.9)	(58.3)
Prepaids and other assets	(102.4)	(47.9)
Accounts payable	14.3	5.7
Accrued compensation and employee benefits	(39.6)	(24.9)
Deferred revenue	29.8	40.3
Other liabilities	(16.1)	(6.1)
Net cash provided by operating activities	511.7	458.0
Investing activities:
Purchase of investments	(851.6)	(707.0)
Proceeds from sales of investments	259.0	1,474.9
Proceeds from maturities of investments	724.9	294.9
Purchase of property, plant, and equipment and intellectual property	(84.9)	(108.3)
Payments to Acquire Businesses, Net of Cash Acquired	(38.1)	0.0
Net cash provided by investing activities	9.3	954.5
Financing activities:
Proceeds from issuance of common stock relating to employee stock plans	134.9	296.4
Taxes paid related to net share settlement of equity awards	(108.0)	(50.0)
Repurchase of common stock	0.0	(2,000.0)
Other financing activities	8.0	0.0
Net cash provided by (used in) financing activities	34.9	(1,753.6)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(0.6)	1.0
Net increase (decrease) in cash, cash equivalents, and restricted cash	555.3	(340.1)
Cash, cash equivalents, and restricted cash, beginning of period	663.2	1,051.6
Cash, cash equivalents, and restricted cash, end of period	$ 1,218.5	$ 711.5

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DESCRIPTION OF THE BUSINESS

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

DESCRIPTION OF THE BUSINESS

DESCRIPTION OF THE BUSINESS

Intuitive Surgical, Inc. designs, manufactures, and markets da Vinci^® Surgical Systems and related instruments and accessories, which taken together, the Company considers to be an advanced generation of surgery. This advanced generation of surgery, which the Company calls da Vinci Surgery, combines the benefits of minimally invasive surgery (“MIS”) for patients with the ease of use, precision, and dexterity of open surgery. A da Vinci Surgical System consists of a surgeon’s console, a patient-side cart, and a high performance vision system. The da Vinci Surgical System translates a surgeon’s natural hand movements, which are performed on instrument controls at a console, into corresponding micro-movements of instruments positioned inside the patient through small incisions, or ports. The da Vinci Surgical System is designed to provide its operating surgeons with intuitive control, range of motion, fine tissue manipulation capability, and Three Dimensional (“3-D”) High-Definition (“HD”) vision while simultaneously allowing surgeons to work through the small ports enabled by MIS procedures.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements (“Financial Statements”) of Intuitive Surgical, Inc. and its wholly- and majority-owned subsidiaries have been prepared on a consistent basis with the audited Consolidated Financial Statements for the fiscal year ended December 31, 2017, and include all adjustments, consisting of only normal recurring adjustments, necessary to fairly state the information set forth herein. The Financial Statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) and therefore, omit certain information and footnote disclosure necessary to present the Financial Statements in accordance with accounting principles generally accepted in the United States (“U.S.”) (“U.S. GAAP”). These Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, which was filed with the SEC on February 2, 2018. The results of operations for the first six months of fiscal year 2018 are not necessarily indicative of the results to be expected for the entire fiscal year or any future periods.

The Financial Statements include the results and the balances of the Company’s majority owned joint venture with Shanghai Fosun Pharmaceutical (Group) Co., Ltd. The Company holds a controlling financial interest in the joint venture and the noncontrolling interest is reflected as a separate component of consolidated stockholders’ equity.

Recent Accounting Pronouncements Not Yet Adopted

In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases (Topic 842), which amends the existing accounting standards for leases. The new standard requires lessees to record a right-of-use asset and a corresponding lease liability on the balance sheet (with the exception of short-term leases). The new standard also requires expanded disclosures regarding leasing arrangements. The new standard becomes effective for the Company in the first quarter of fiscal year 2019 and early adoption is permitted. The new standard is required to be adopted using the modified retrospective approach and requires application of the new standard at the beginning of the earliest comparative period presented. The Company generally does not finance purchases of equipment or other capital, but does lease some of its facilities. The Company’s customers finance purchases of da Vincisystems and ancillary products, including directly with the Company. It is currently unknown whether the new standard will change customer buying patterns or behaviors. The Company is evaluating the effect that this new standard will have on its Financial Statements and related disclosures.

Adopted Accounting Pronouncement

Revenue from Contracts with Customers

The Company adopted FASB Accounting Standards Codification Topic 606 (“ASC 606”), Revenue from Contracts with Customers in the first quarter of the Company’s fiscal year that began on January 1, 2018, using the full retrospective method, which required the Company to restate each prior reporting period presented. This new standard replaced the previous revenue recognition guidance in U.S. GAAP. Please see the Company’s “Revenue Recognition” policy in the “Significant Accounting Policies” section below.

The areas impacted include future contractual billings related to services included in the Company’s multi-year contracts, which are considered performance obligations that should be part of the contract consideration allocated to all performance obligations rather than being excluded due to its contingent nature as required under the previous revenue standard. Accordingly, the amount of contract consideration allocated to the performance obligations identified in the Company’s system arrangements is different from the amounts allocated under the previous revenue standard. In general, revenue is recognized earlier as a greater amount of the contract consideration is allocated to the product-related performance obligations that generally are delivered upfront, and therefore, less consideration is allocated to the service performance obligation that is generally recognized over the service period.

In addition, the Company recognized an asset associated with the incremental costs of obtaining revenue generating customer contracts that it expects to benefit from over a period longer than one year. The Company capitalized sales commissions paid in connection with system sale arrangements that include multi-year service obligations and is amortizing such asset over the economic life of those contracts. Previously, sales commissions were expensed as incurred. The impact of this change on operating expenses in any given period will depend, in part, on the amount of such commissions incurred and capitalized in relation to the amount of ongoing amortization expense.

Adoption of the standard using the full retrospective method also required the Company to restate certain previously reported results, including the impact to provision for income taxes. The adjustments to the unaudited Condensed Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2017, are as follows (in millions, except per share amounts):

	Three Months Ended June 30, 2017							Six Months Ended June 30, 2017
	As Previously Reported		Adjustments			As Restated		As Previously Reported		Adjustments			As Restated
Revenue:
Product	$	614.2	$	4.7		$	618.9	$	1,148.2	$	12.3		$	1,160.5
Service	142.0		(2.1		)	139.9		282.2		(4.3		)	277.9
Total revenue	756.2		2.6			758.8		1,430.4		8.0			1,438.4
Cost of revenue:
Product	184.3		0.4			184.7		348.1		2.1			350.2
Service	44.0		—			44.0		88.3		—			88.3
Total cost of revenue	228.3		0.4			228.7		436.4		2.1			438.5
Gross profit	527.9		2.2			530.1		994.0		5.9			999.9
Operating expenses:
Selling, general and administrative	185.8		(0.2		)	185.6		386.9		1.6			388.5
Research and development	84.6		—			84.6		158.1		—			158.1
Total operating expenses	270.4		(0.2		)	270.2		545.0		1.6			546.6
Income from operations	257.5		2.4			259.9		449.0		4.3			453.3
Interest and other income, net	10.1		—			10.1		18.8		—			18.8
Income before taxes	267.6		2.4			270.0		467.8		4.3			472.1
Income tax expense	46.1		0.9			47.0		66.5		1.8			68.3
Net income attributable to Intuitive Surgical, Inc.	$	221.5	$	1.5		$	223.0	$	401.3	$	2.5		$	403.8
Net income per share attributable to Intuitive Surgical, Inc.:
Basic	$	2.00	$	0.01		$	2.01	$	3.60	$	0.02		$	3.62
Diluted	$	1.92	$	0.02		$	1.94	$	3.47	$	0.03		$	3.50
Total comprehensive income attributable to Intuitive Surgical, Inc.	$	219.7	$	1.5		$	221.2	$	400.4	$	2.5		$	402.9

Selected Condensed Consolidated Statements of Balance Sheet line items, which reflect the impact of adopting the new standard, are as follow (in millions) as of December 31, 2017:

	December 31, 2017
	As Previously Reported		Adjustments			As Restated
ASSETS
Accounts receivable, net	$	511.9	$	(4.0	)	$	507.9
Prepaids and other current assets	$	97.2	$	2.0		$	99.2
Deferred tax assets	$	87.3	$	(15.3	)	$	72.0
Intangibles and other assets, net	$	159.7	$	36.1		$	195.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue	$	284.5	$	(40.7	)	$	243.8
Other accrued liabilities	$	169.5	$	(0.6	)	$	168.9
Other long-term liabilities	$	327.1	$	6.5		$	333.6
Retained earnings	$	61.4	$	53.6		$	115.0

In addition, the cumulative effect of ASC 606 to the Company’s retained earnings at January 1, 2016 was $40.3 million. Adoption of the standard had no impact to total net cash from or used in operating, investing, or financing activities within the Condensed Consolidated Statements of Cash Flows.

As part of the Company’s adoption of ASC 606, the Company elected to use the following practical expedients (i) to exclude disclosures of transaction prices allocated to remaining performance obligations when the Company expects to recognize such revenue for all periods prior to the date of initial application of ASC 606; (ii) not to adjust the promised amount of consideration for the effects of a significant financing component when the Company expects, at contract inception, that the period between the Company’s transfer of a promised product or service to a customer and when the customer pays for that product or service will be one year or less; (iii) to expense costs as incurred for costs to obtain a contract when the amortization period would have been one year or less; (iv) not to recast revenue for contracts that begin and end in the same fiscal year; and (v) not to assess whether promised goods or services are performance obligations if they are immaterial in the context of the contract with the customer.

Intra-Entity Transfer of Assets Other than Inventory

Beginning fiscal 2018, the Company adopted ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfer of Assets Other than Inventory, which requires the recognition of the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The Company adopted this standard using the modified retrospective approach, and as a result, recorded a deferred tax asset with a corresponding cumulative adjustment to retained earnings of $390.8 million as of January 1, 2018, associated with an intra-entity transfer of certain intellectual property rights related to the Company’s non-U.S. business to its Swiss entity. The adjustment may be materially different as a result of recording additional deferred taxes upon finalization of the assessment of global intangible low-taxed income and other aspects from additional guidance and interpretations by U.S. regulatory and standard-setting bodies related to the Tax Cuts and Jobs Act (the “Tax Act”) enacted on December 22, 2017.

Business Combinations: Clarifying the Definition of a Business

Beginning fiscal 2018, the Company adopted ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which clarifies the definition of a business to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses, and applied the new guidance prospectively. In the second quarter of 2018, the Company acquired certain assets related to a distribution business which was accounted for as a business combination. Refer to “Note 4. Balance Sheet Details and Other Information” for further information on the acquisition.

Statement of Cash Flow: Restricted Cash

Beginning fiscal 2018, the Company adopted ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which requires the statement of cash flows to explain the change during the period relating to total cash, cash equivalents, and restricted cash. The Company adopted this standard using the retrospective transition method by restating its condensed consolidated statements of cash flows to include restricted cash of $15.0 million in the beginning and ending cash, cash equivalents, and restricted cash balances for all periods presented. Net cash flows for the six months ended June 30, 2017, did not change as a result of including restricted cash with cash and cash equivalents when reconciling the beginning-of-period and end-of-period amounts presented on the statements of cash flows. Restricted cash was included in intangible and other assets, net on the Company’s condensed consolidated balance sheets.

Significant Accounting Policies

With the exception of the change in the Company’s Revenue Recognition policy as a result of the adoption of ASC 606, there have been no new or material changes to the significant accounting policies discussed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, that are of significance, or potential significance, to the Company. 

Revenue Recognition

The Company adopted ASC Topic 606, Revenue from Contracts with Customers, on January 1, 2018. The Company’s revenue consists of product revenue resulting from the sale of systems, system components, instruments and accessories, and service revenue. The Company accounts for a contract with a customer when there is a legally enforceable contract between the Company and its customer, the rights of the parties are identified, the contract has commercial substance, and collectability of the contract consideration is probable. The Company’s revenues are measured based on the consideration specified in the contract with each customer, net of any sales incentives and taxes collected from customers that are remitted to government authorities.

The Company’s system sale arrangements generally contain multiple products and services. For these bundled sale arrangements, the Company accounts for individual products and services as separate performance obligations if they are a distinct product or service that is separately identifiable from other items in a bundled package, and if a customer can benefit from the product or service on its own or with other resources that are readily available to the customer. The Company’s system sale arrangements include a combination of the following performance obligations: system(s), system components, system accessories, instruments, accessories, and system service. The Company’s system sale arrangements generally include a five-year period of service. The first year of service is generally free and included in the system sale arrangement and the remaining four years are generally included at a stated service price. The Company considers the service terms in the arrangements that are legally enforceable to be performance obligations. Other than service, the Company generally satisfies all of the performance obligations up-front. System components, system accessories, instruments, accessories, and service are also sold on a stand-alone basis.

The Company recognizes revenues as the performance obligations are satisfied by transferring control of the product or service to a customer. The Company generally recognizes revenue for the performance obligations at the following points in time:

•System sales. For systems, system components, and system accessories sold directly to end customers, revenue is recognized when the Company transfers control to the customer, which is generally at the point when acceptance occurs that indicates customer acknowledgment of delivery or installation, depending on the terms of the arrangement. For systems sold through distributors, revenue is recognized generally at the time of shipment. The Company’s system arrangements generally do not provide a right of return. The systems are generally covered by a one-year warranty. Warranty costs were not material for the periods presented.

•Instruments and accessories. Revenue from sales of instruments and accessories is recognized when control is transferred to the customers, which generally occurs at the time of shipment, but also occurs at the time of delivery depending on the customer arrangement. The Company allows its customers in the normal course of business to return unused products for a limited period of time subsequent to initial purchase and records an allowance against revenue for estimated returns.

•Service. Service revenue is recognized ratably over the term of the service period as the customers benefit from the service throughout the service period. Revenue related to services performed on a time-and-materials basis is recognized when performed.

The Company offers its customers the opportunity to trade in their older systems for a credit towards the purchase of a newer generation system. The Company generally does not provide specified price trade-in rights or upgrade rights at the time of system purchase. Such trade-in or upgrade transactions are separately negotiated based on the circumstances at the time of the trade-in or upgrade, based on the then fair value of the system, and are generally not based on any pre-existing rights granted by the Company. Accordingly, such trade-ins and upgrades are not considered as separate performance obligations in the arrangement for a system sale.

As part of a trade-in transaction, the customer receives a new generation system in exchange for its pre-owned system. The trade-in credit is negotiated at the time of the trade-in and is applied towards the purchase price of the new unit. Traded-in systems generally can be reconditioned and resold. The Company accounts for the fair value of the traded-in system in the total consideration in the arrangement by including the net realizable value of the traded-in system less a normal profit margin. The value of the traded-in system is determined as the amount, after reconditioning costs are added, that will allow a normal profit margin on the sale of the reconditioned unit to be generated. When there is no market for the traded-in units, no value is assigned. Traded-in units are reported as a component of inventory until resold, or otherwise disposed.

In addition, customers may also have the opportunity to upgrade their systems at a price determined at the time of the upgrade, for example, by adding a second surgeon console for use with the da Vinci Si, Xi,andXSurgical System. Such upgrades are performed by completing component level upgrades at the customer’s site. Upgrade revenue is recognized when the component level upgrades are complete and all revenue recognition criteria are met.

For multiple-element arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price. Standalone selling prices are based on observable prices at which the Company separately sells the products or services. If a standalone selling price is not directly observable, then the Company estimates the standalone selling price considering market conditions and entity-specific factors including, but not limited to, features and functionality of the products and services, geographies, and type of customer. The Company regularly reviews standalone selling prices and updates these estimates as necessary.

The following table presents revenue disaggregated by types and geography (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
U.S.	2018		2017		2018		2017
Instruments and accessories	$	360.3	$	309.4	$	697.9	$	597.0
Systems	172.4		141.3		296.4		246.7
Services	112.0		101.9		222.8		203.7
Total U.S. revenue	$	644.7	$	552.6	$	1,217.1	$	1,047.4
Outside of U.S. (“OUS”)
Instruments and accessories	$	115.8	$	88.4	$	238.5	$	181.6
Systems	105.0		79.8		215.5		135.2
Services	43.8		38.0		85.7		74.2
Total OUS revenue	$	264.6	$	206.2	$	539.7	$	391.0
Total
Instruments and accessories	$	476.1	$	397.8	$	936.4	$	778.6
Systems	277.4		221.1		511.9		381.9
Services	155.8		139.9		308.5		277.9
Total revenue	$	909.3	$	758.8	$	1,756.8	$	1,438.4

The transaction price allocated to remaining performance obligations relates to amounts allocated to products and services for which revenue has not yet been recognized. A significant portion of this amount relates to performance obligations in the Company’s service contracts that will be satisfied and recognized as revenue in future periods. Transaction price allocated to remaining performance obligations was approximately $1,264.0 million as of June 30, 2018.

The following information summarizes the Company’s contract assets and liabilities (in millions):

	As of
	June 30, 2018		December 31, 2017
Contract assets	$	11.1	$	8.3
Deferred revenue	$	302.2	$	268.6

The Company invoices its customers based on the billing schedules in its sales arrangements. Payments are generally due 30 days from date of invoice. Contract assets for the periods presented primarily represent the difference between the revenue that was recognized based on the relative selling price of the related performance obligations satisfied and the contractual billing terms in the arrangements. Deferred revenue for the periods presented primarily relates to service contracts, where the service fees are billed up-front, generally quarterly or annually, prior to those services having been performed. The associated deferred revenue is generally recognized ratably over the service period. The Company did not have any significant impairment losses on its contract assets for the periods presented.

During the three and six months ended June 30, 2018, the Company recognized revenue of $82.0 million and $197.8 million, respectively, which was included in the deferred revenue balance as of December 31, 2017. During the three and six months ended June 30, 2017, the Company recognized revenue of $68.2 million and $166.7 million, respectively, which was included in the deferred revenue balance as of December 31, 2016.

Assets Recognized from the Costs to Obtain a Contract with a Customer

The Company has determined that certain sales incentives provided to the Company’s sales team meet the requirements to be capitalized when the Company expects to generate future economic benefits from the related revenue generating contracts subsequent to the initial capital sales transaction. When determining the economic life of the contract acquisition assets recognized, the Company considers historical service renewal rates, expectations of future customer renewals of service contracts, and other factors that could impact the economic benefits that the Company expects to generate from the relationship with its customers. The costs capitalized as contract acquisition costs included in intangible and other assets, net in the Company’s condensed consolidated balance sheets were $31.0 million and $31.4 million as of June 30, 2018, and December 31, 2017, respectively. The Company did not incur any impairment losses during the periods presented.

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FINANCIAL INSTRUMENTS

6 Months Ended

Jun. 30, 2018

Investments, All Other Investments [Abstract]

FINANCIAL INSTRUMENTS

FINANCIAL INSTRUMENTS

Cash, Cash Equivalents, and Investments

The following tables summarize the Company’s cash and available-for-sale marketable securities’ amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category reported as cash and cash equivalents, short-term, or long-term investments as of June 30, 2018, and December 31, 2017 (in millions):

										Reported as:
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short- term Investments		Long- term Investments
June 30, 2018
Cash	$	242.0	$	—	$	—		$	242.0	$	242.0	$	—	$	—
Level 1:
Money market funds	738.7		—		—			738.7		738.7		—		—
U.S. treasuries	1,192.5		—		(8.1		)	1,184.4		63.4		627.2		493.8
Subtotal	1,931.2		—		(8.1		)	1,923.1		802.1		627.2		493.8
Level 2:
Commercial paper	170.2		—		—			170.2		112.9		57.3		—
Corporate debt securities	1,036.2		0.4		(6.1		)	1,030.5		3.2		581.1		446.2
U.S. government agencies	882.3		0.2		(6.2		)	876.3		43.3		454.1		378.9
Municipal securities	17.5		—		—			17.5		—		9.3		8.2
Subtotal	2,106.2		0.6		(12.3		)	2,094.5		159.4		1,101.8		833.3
Total assets measured at fair value	$	4,279.4	$	0.6	$	(20.4	)	$	4,259.6	$	1,203.5	$	1,729.0	$	1,327.1

										Reported as:
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short- term Investments		Long- term Investments
December 31, 2017
Cash	$	197.7	$	—	$	—		$	197.7	$	197.7	$	—	$	—
Level 1:
Money market funds	445.0		—		—			445.0		445.0		—		—
U.S. treasuries	1,029.1		—		(4.7		)	1,024.4		5.5		396.2		622.7
Subtotal	1,474.1		—		(4.7		)	1,469.4		450.5		396.2		622.7
Level 2:
Commercial paper	38.4		—		—			38.4		—		38.4		—
Corporate debt securities	946.6		0.2		(4.4		)	942.4		—		403.9		538.5
U.S. government agencies	901.3		—		(4.4		)	896.9		—		311.7		585.2
Non-U.S. government securities	2.5		—		—			2.5		—		2.5		—
Municipal securities	301.1		—		(1.9		)	299.2		—		159.7		139.5
Subtotal	2,189.9		0.2		(10.7		)	2,179.4		—		916.2		1,263.2
Total assets measured at fair value	$	3,861.7	$	0.2	$	(15.4	)	$	3,846.5	$	648.2	$	1,312.4	$	1,885.9

The following table summarizes the contractual maturities of the Company’s cash equivalents and available-for-sale investments (excluding cash and money market funds), as of June 30, 2018 (in millions):

	Amortized Cost		Fair Value
Mature in less than one year	$	1,957.5	$	1,951.8
Mature in one to five years	1,341.2		1,327.1
Total	$	3,298.7	$	3,278.9

Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay certain obligations. Realized gains and losses, recognized on the sale of investments, were not material for any of the periods presented. There were no transfers between Level 1 and Level 2 measurements during the six months ended June 30, 2018, and there were no changes in the valuation techniques used by the Company.

Foreign Currency Derivatives

The objective of the Company’s hedging program is to mitigate the impact of changes in currency exchange rates on cash flow from foreign currency denominated sales, expenses, intercompany balances, and other monetary assets or liabilities denominated in currencies other than the U.S. dollar (“USD”). The terms of the Company’s derivative contracts are generally twelve months or shorter. The derivative assets and liabilities are measured using Level 2 fair value inputs.

Cash Flow Hedges

The Company enters into currency forward contracts as cash flow hedges to hedge certain forecasted revenue transactions denominated in currencies other than the USD, primarily the European Euro (“EUR”), the British Pound (“GBP”), the Japanese Yen (“JPY”), and the Korean Won (“KRW”). The Company also enters into currency forward contracts as cash flow hedges to hedge certain forecasted expense transactions denominated in EUR and the Swiss Franc (“CHF”).

For these derivatives, the Company reports the after-tax gain or loss from the hedge as a component of accumulated other comprehensive gain (loss) in stockholders’ equity and reclassifies it into earnings in the same period in which the hedged transaction affects earnings. The amounts reclassified to revenue and expenses related to the hedged transactions and the ineffective portions of cash flow hedges were not material for the periods presented.

Other Derivatives Not Designated as Hedging Instruments

Other derivatives not designated as hedging instruments consist primarily of forward contracts that the Company uses to hedge intercompany balances and other monetary assets or liabilities denominated in currencies other than the USD, primarily the EUR, GBP, JPY, KRW, and CHF. The net gains (losses) recognized in interest and other income, net in the Condensed Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2018, and 2017, were not material.

The notional amounts for derivative instruments provide one measure of the transaction volume. Total gross notional amounts (in USD) for outstanding derivatives and aggregate gross fair value at the end of each period were as follows (in millions):

	Derivatives Designated as Hedging Instruments				Derivatives Not Designated as Hedging Instruments
	June 30, 2018		December 31, 2017		June 30, 2018		December 31, 2017
Notional amounts:
Forward contracts	$	138.1	$	128.5	$	143.3	$	168.4
Gross fair value recorded in:
Prepaids and other current assets	$	4.5	$	0.9	$	2.9	$	1.2
Other accrued liabilities	$	0.8	$	2.9	$	0.8	$	4.6

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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION

BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION

Balance Sheet Details

The following tables provide details of selected balance sheet items (in millions):

	As of
Inventory	June 30, 2018		December 31, 2017
Raw materials	$	129.5	$	80.9
Work-in-process	35.9		19.7
Finished goods	166.1		140.6
Total inventory	$	331.5	$	241.2

	As of
Other accrued liabilities - short-term	June 30, 2018		December 31, 2017
Taxes payable	$	17.9	$	63.1
Litigation related accruals	59.8		13.8
Other accrued liabilities	86.4		92.0
Total other accrued liabilities—short-term	$	164.1	$	168.9

	As of
Other long-term liabilities	June 30, 2018		December 31, 2017
Income taxes—long-term	$	262.5	$	286.8
Deferred revenue—long-term	30.1		24.8
Other long-term liabilities	21.4		22.0
Total other long-term liabilities	$	314.0	$	333.6

Goodwill and Intangible Assets

The increases in goodwill and intangible assets from December 31, 2017, to June 30, 2018, primarily relate to the termination of the Company’s India distribution relationship with Vattikuti Technologies Pvt. Ltd. and acquisition of certain assets related to that distribution business on May 25, 2018, that collectively met the definition of a business and was accounted for as a business combination. The transaction enhances the Company’s ability to serve patients, surgeons, and hospitals in India. 

The purchase consideration consisted of a cash payment of $38.1 million, which was preliminarily allocated to net tangible assets of $4.1 million, goodwill of $9.8 million, and intangible assets of $24.2 million related to reacquired distribution rights, customer relationships, and a non-compete agreement, which are being amortized over a weighted average period of 4.3 years.

The Company has included the results of the Indian operations post the date of acquisition in its Financial Statements, which have not been material to date. Pro forma results of operations related to the acquisition have not been presented since the operating results of the acquired business are not material to the Company’s Financial Statements.

Supplemental Cash Flow Information

The following table provides supplemental non-cash investing activities (in millions):

	Six Months Ended June 30,
	2018		2017
Equipment transfers, including operating lease assets, from inventory to property, plant, and equipment	$	49.0	$	29.6

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LEASE RECEIVABLES

6 Months Ended

Jun. 30, 2018

Leases [Abstract]

LEASE RECEIVABLES

LEASE RECEIVABLES

Lease receivables relating to sales-type lease arrangements are presented on the Condensed Consolidated Balance Sheets as follows (in millions):

	As of
	June 30, 2018			December 31, 2017
Gross lease receivables	$	132.8		$	128.0
Unearned income	(5.1		)	(5.0		)
Allowance for credit loss	(1.0		)	(0.9		)
Net investment in sales-type leases	$	126.7		$	122.1
Reported as:
Prepaids and other current assets	$	47.2		$	41.9
Intangible and other assets, net	79.5			80.2
Total, net	$	126.7		$	122.1

Contractual maturities of gross lease receivables at June 30, 2018, are as follows (in millions):

	Amount
2018	$	21.7
2019	45.2
2020	34.6
2021	18.7
2022	10.1
2023 and thereafter	2.5
Total	$	132.8

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CONTINGENCIES

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

CONTINGENCIES

CONTINGENCIES

The Company is involved in a variety of claims, lawsuits, investigations and proceedings relating to securities laws, product liability, intellectual property, insurance, contract disputes, employment, and other matters. Certain of these lawsuits and claims are described in further detail below. It is not possible to predict what the outcome of these matters will be and the Company cannot guarantee that any resolution will be reached on commercially reasonable terms, if at all.

A liability and related charge to earnings are recorded in the Company’s Financial Statements for legal contingencies when the loss is considered probable and the amount can be reasonably estimated. The assessment is re-evaluated each accounting period and is based on all available information, including impact of negotiations, settlements, rulings, advice of legal counsel, and other information and events pertaining to each case. Nevertheless, it is possible that additional future legal costs (including settlements, judgments, legal fees, and other related defense costs) could have a material adverse effect on the Company’s business, financial position, or future results of operations. During the three and six months ended June 30, 2018, the Company recorded pre-tax charges of $42.5 million and $47.0 million, respectively, related to the securities class action lawsuits and the tolled product liability claims described below. A total of $58.3 million and $12.8 million associated with these matters were included in other accrued liabilities in the accompanying Condensed Consolidated Balance Sheets as of June 30, 2018, and December 31, 2017, respectively.

Purported Shareholder Class Action Lawsuits filed April 26, 2013, and May 24, 2013

On April 26, 2013, a purported class action lawsuit entitled Abrams v. Intuitive Surgical, et al., No. 5-13-cv-1920, was filed against a number of the Company’s current and former officers and directors in the U.S. District Court for the Northern District of California. A substantially identical complaint, entitled Adel v. Intuitive Surgical, et al., No. 5:13-cv-02365, was filed in the same court against the same defendants on May 24, 2013. The Adel case was voluntarily dismissed without prejudice on August 20, 2013.

On October 15, 2013, plaintiffs in the Abrams matter filed an amended complaint. The case has since been retitled In re Intuitive Surgical Securities Litigation, No. 5:13-cv-1920. The plaintiffs seek unspecified damages on behalf of a putative class of persons who purchased or otherwise acquired the Company’s common stock between February 6, 2012, and July 18, 2013. The amended complaint alleges that the defendants violated federal securities laws by allegedly making false and misleading statements and omitting certain material facts in certain public statements and in the Company’s filings with the SEC. On November 18, 2013, the court appointed the Employees’ Retirement System of the State of Hawaii as lead plaintiff and appointed lead counsel. The Company filed a motion to dismiss the amended complaint on December 16, 2013, which was granted in part and denied in part on August 21, 2014. The plaintiffs elected not to further amend their complaint at that time. The plaintiffs moved for class certification on September 1, 2015, and following opposition and reply briefing, the court held a hearing on the motion on January 21, 2016. On November 2, 2016, Labaton Sucharow LLP filed a motion for leave to file an amended complaint. On December 22, 2016, the court entered an order granting plaintiffs’ motion for class certification. On January 25, 2017, the court entered an order granting plaintiffs’ motion for leave to amend the complaint. On February 9, 2017, the Company moved to dismiss the amended complaint. Following opposition and reply briefing, the matter was fully submitted to the court on March 2, 2017. The court denied the motion on September 29, 2017. On July 13, 2017, the parties filed a stipulation vacating the case schedule, which the court entered on July 14, 2017. On November 8, 2017, the court entered a new case schedule, with trial set to begin on October 30, 2018.

On December 6, 2017, plaintiffs moved for approval of a proposed notice to the class members; the Company partially opposed that motion. The court held a hearing regarding the motion on March 8, 2018, and ordered the parties to edit the proposed notice and submit it to the court for approval. On March 9, 2018, the parties submitted a joint proposed notice, which the court approved on March 12, 2018. On February 9, 2018, the Company filed a motion for summary judgment, which plaintiffs opposed on March 23, 2018. On June 11, 2018, the Company reached an agreement in principle to enter into a settlement agreement which stipulates a payment of $42.5 million by the Company, subject to approval by the U.S. District Court for the Northern District of California. The agreement in principle is subject to certain conditions, including court approval of a final settlement agreement. There can be no assurance that the parties will enter into a final settlement agreement or that such agreement will be approved by the court. During the three and six months ended June 30, 2018, the Company recorded a pre-tax charge of $42.5 million for this matter.

Product Liability Litigation

The Company is currently named as a defendant in a number of individual product liability lawsuits filed in various state and federal courts. The plaintiffs generally allege that they or a family member underwent surgical procedures that utilized the da Vinci Surgical System and sustained a variety of personal injuries and, in some cases death as a result of such surgery. Several of these cases have trial dates in the next 12 months.

The cases raise a variety of allegations including, to varying degrees, that plaintiffs’ injuries resulted from purported defects in the da Vinci Surgical System and/or failure on the Company’s part to provide adequate training resources to the healthcare professionals who performed plaintiffs’ surgeries. The cases further allege that the Company failed to adequately disclose and/or misrepresented the potential risks and/or benefits of the da Vinci Surgical System. Plaintiffs also assert a variety of causes of action, including for example, strict liability based on purported design defects, negligence, fraud, breach of express and implied warranties, unjust enrichment, and loss of consortium. Plaintiffs seek recovery for alleged personal injuries and, in many cases, punitive damages.

In addition to the filed cases, the Company received a substantial number of claims relating to alleged complications from surgeries performed with certain versions of Monopolar Curved Scissor (“MCS”) instruments which included an MCS tip cover accessory that was the subject of a market withdrawal in 2012 and MCS instruments that were the subject of a recall in 2013. In an effort to avoid the expense and distraction of defending multiple lawsuits, the Company entered into tolling agreements to pause the applicable statutes of limitations for many of these claims and engaged in confidential mediation efforts. As of June 30, 2018, all such “tolling agreements” have expired and the majority of the “tolled claims” have either been resolved or the matters have been filed.

During the three and six months ended June 30, 2018, the Company recorded pre-tax charges of zero and $4.5 million, respectively, compared with $2.5 million and $16.0 million, for the three and six months ended June 30, 2017, respectively, to reflect the estimated cost of settling a number of the product liability claims that are or that had been covered by the tolling agreements. As of June 30, 2018, and December 31, 2017, a total of $15.8 million and $12.8 million, respectively, were included in other accrued liabilities in the accompanying Condensed Consolidated Balance Sheets related to the tolled product liability claims.

The Company’s estimate of the anticipated cost of resolving the pending cases is based on negotiations with attorneys for the claimants. Nonetheless, it is possible that more claims will be made by additional individuals. Consequently, the final outcome of these claims is dependent on many variables that are difficult to predict and the ultimate cost associated with these product liability claims may be materially different than the amount of the current estimate and accruals and could have a material adverse effect on the Company’s business, financial position, and future results of operations. Although there is a reasonable possibility that a loss in excess of the amount recognized exists, the Company is unable to estimate the possible loss or range of loss in excess of the amount recognized at this time.

Patent Litigation

On June 30, 2017, Ethicon LLC, Ethicon Endo-Surgery, Inc., and Ethicon US LLC (collectively, “Ethicon”) filed a complaint for patent infringement against the Company in the U.S. District Court for the District of Delaware. The complaint, which was served on the Company on July 12, 2017, alleges that the Company’s EndoWrist Stapler instruments infringe several of Ethicon’s patents. Ethicon asserts infringement of U.S. Patent Nos. 9,585,658, 8,479,969, 9,113,874, 8,998,058, 8,991,677, 9,084,601, and 8,616,431. The parties are currently engaged in fact discovery regarding Ethicon’s allegations. A claim construction hearing is set for October 1, 2018. Based on currently available information, the Company is unable to make a reasonable estimate of loss or range of losses, if any, arising from this matter.

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STOCKHOLDERS' EQUITY

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS’ EQUITY

Stock Repurchase Program

The Company’s Board of Directors (the “Board”) has authorized an aggregate of $6.2 billion of funding for the Company’s common stock repurchase program (the “Repurchase Program”) since its establishment in March 2009. The most recent authorization occurred in December 2016 when the Board increased the authorized amount available under Repurchase Program to $3.0 billion. As of June 30, 2018, the remaining amount of share repurchases authorized by the Board was approximately $717.5 million.

There were no shares repurchased during the six months ended June 30, 2018. On January 24, 2017, the Company entered into an accelerated share repurchase program (the “ASR Program”) with Goldman Sachs & Co. LLC (“Goldman”) and Goldman delivered to the Company approximately 7.3 million shares of the Company’s common stock, for which the Company made a payment of $2.0 billion to Goldman. On December 7, 2017, the Company completed the ASR Program by making a final settlement payment of $274.0 million to Goldman. The final average price per share paid under the ASR Program was $310.32.

Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income (loss), net of tax, for the three and six months ended June 30, 2018, and 2017, are as follows (in millions):

	Three Months Ended June 30, 2018
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	(3.2	)	$	(17.5	)	$	6.8		$	(4.2	)	$	(18.1	)
Other comprehensive income (loss) before reclassifications	6.2			0.8			(5.9		)	(0.3		)	0.8
Amounts reclassified from accumulated other comprehensive income (loss)	0.4			—			—			0.5			0.9
Net current-period other comprehensive income (loss)	6.6			0.8			(5.9		)	0.2			1.7
Ending balance	$	3.4		$	(16.7	)	$	0.9		$	(4.0	)	$	(16.4	)
	Three Months Ended June 30, 2017
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	1.1		$	(5.8	)	$	0.5		$	(3.8	)	$	(8.0	)
Other comprehensive income (loss) before reclassifications	(3.0		)	0.4			0.5			—			(2.1		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			0.1			—			0.2			0.3
Net current-period other comprehensive income (loss)	(3.0		)	0.5			0.5			0.2			(1.8		)
Ending balance	$	(1.9	)	$	(5.3	)	$	1.0		$	(3.6	)	$	(9.8	)

	Six Months Ended June 30, 2018
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	(2.4	)	$	(11.3	)	$	2.3		$	(4.1	)	$	(15.5	)
Other comprehensive income (loss) before reclassifications	3.2			(6.6		)	(1.4		)	—			(4.8		)
Amounts reclassified from accumulated other comprehensive income (loss)	2.6			1.2			—			0.1			3.9
Net current-period other comprehensive income (loss)	5.8			(5.4		)	(1.4		)	0.1			(0.9		)
Ending balance	$	3.4		$	(16.7	)	$	0.9		$	(4.0	)	$	(16.4	)
	Six Months Ended June 30, 2017
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	5.0		$	(8.6	)	$	(1.3	)	$	(4.0	)	$	(8.9	)
Other comprehensive income (loss) before reclassifications	(5.1		)	3.3			2.3			0.1			0.6
Amounts reclassified from accumulated other comprehensive income (loss)	(1.8		)	—			—			0.3			(1.5		)
Net current-period other comprehensive income (loss)	(6.9		)	3.3			2.3			0.4			(0.9		)
Ending balance	$	(1.9	)	$	(5.3	)	$	1.0		$	(3.6	)	$	(9.8	)

Retained Earnings

For the three and six months ended June 30, 2018, retained earnings balance included a reduction of $5.2 million and $101.9 million, respectively, for shares withheld related to net share settlements of employee equity awards.

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SHARE-BASED COMPENSATION

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION

As of June 30, 2018, approximately 4.7 million shares of common stock were reserved for future issuance under the Company’s stock plans. A maximum of approximately 2.0 million of these shares can be awarded as restricted stock units (“RSUs”).

Stock Option Information

A summary of stock option activity under all stock plans for the six months ended June 30, 2018, is presented as follows (in millions, except per share amounts):

	Stock Options Outstanding
	Number Outstanding		Weighted Average Exercise Price Per Share
Balance at December 31, 2017	7.2		$	164.16
Granted	0.3		$	422.16
Exercised	(0.9	)	$	123.78
Forfeited/expired	(0.1	)	$	209.31
Balance at June 30, 2018	6.5		$	179.88

As of June 30, 2018, options to purchase an aggregate of 5.2 million shares of common stock were exercisable at a weighted average price of $155.63 per share.

Restricted Stock Units Information

A summary of RSU activity for the six months ended June 30, 2018, is presented as follows (in millions, except per share amounts):

	Shares		Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2017	2.1		$	209.55
Granted	0.8		$	419.66
Vested	(0.7	)	$	191.87
Forfeited	(0.1	)	$	257.10
Unvested balance at June 30, 2018	2.1		$	284.65

Employee Stock Purchase Plan

Under the Employee Stock Purchase Plan (“ESPP”), employees purchased approximately 0.1 million shares for $25.3 million and approximately 0.1 million shares for $20.9 million during the six months ended June 30, 2018, and 2017, respectively.

Share-based Compensation Expense

The following table summarizes share-based compensation expense for the three and six months ended June 30, 2018, and 2017 (in millions):

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2018		2017		2018		2017
Cost of sales - products	$	8.9	$	6.7	$	17.1	$	13.5
Cost of sales - services	4.1		3.5		8.0		6.7
Total cost of sales	13.0		10.2		25.1		20.2
Selling, general and administrative	32.7		26.6		62.2		52.3
Research and development	17.9		13.8		34.2		25.7
Share-based compensation expense before income taxes	63.6		50.6		121.5		98.2
Income tax benefit	12.8		16.4		25.1		31.9
Share-based compensation expense after income taxes	$	50.8	$	34.2	$	96.4	$	66.3

The Black-Scholes option pricing model is used to estimate the fair value of stock options granted under the Company’s stock plans and rights to acquire stock granted under the Company’s ESPP. The weighted average estimated fair values of stock options and rights to acquire stock under the ESPP, as well as the weighted average assumptions used in calculating those fair values, were as follows:

	Three Months Ended   June 30,						Six Months Ended   June 30,
	2018			2017			2018			2017
Stock Options
Risk-free interest rate	2.7		%	1.8		%	2.6		%	2.0		%
Expected term (in years)	4.2			4.2			4.3			4.3
Expected volatility	33		%	22		%	33		%	24		%
Fair value at grant date	$	139.43		$	59.91		$	131.53		$	57.04
ESPP
Risk-free interest rate	—			—			1.9		%	0.9		%
Expected term (in years)	—			—			1.2			1.3
Expected volatility	—			—			32		%	26		%
Fair value at grant date	—			—			$	124.61		$	61.59

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INCOME TAXES

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

Income tax expense for the three months ended June 30, 2018, was $41.0 million, or 13.9% of income before taxes, compared with $47.0 million, or 17.4% of income before taxes, for the three months ended June 30, 2017. Income tax expense for the six months ended June 30, 2018, was $43.6 million, or 7.4% of income before taxes, compared with $68.3 million, or 14.5% of income before taxes for the six months ended June 30, 2017.

The effective tax rates for the three and six months ended June 30, 2018, differed from the U.S. federal statutory rate of 21% primarily due to excess tax benefits associated with employee equity plans and federal R&D credit benefits, partially offset by state income taxes. The effective tax rates for the three and six months ended June 30, 2017, differed from the U.S. federal statutory rate of 35% primarily due to excess tax benefits associated with employee equity plans and the effect of certain foreign earnings being taxed at rates lower than the federal statutory rate, partially offset by state income taxes.

In connection with the Tax Act enacted in December 2017, the Company recorded a provisional amount of $317.8 million in its income tax expense for the year ended December 31, 2017. In accordance with relevant SEC guidance, the effects of the Tax Act may be adjusted within a one-year measurement period from the enactment date for items that were previously reported as provisional, or where a provisional estimate could not be made. Income tax provision for the three and six months ended June 30, 2018, did not reflect any adjustment to the previously assessed Tax Act enactment effect. Income tax expense for the three and six months ended June 30, 2018, reflected $6.4 million and $15.5 million, respectively, estimated tax on global intangible low-taxed income enacted by the Tax Act. For the global intangible low-taxed income provisions of the Tax Act, the Company has not yet elected an accounting policy with respect to either recognize deferred taxes for basis differences expected to reverse as global intangible low-taxed income, or to record such as period costs if and when incurred. The Company will continue to assess forthcoming guidance and accounting interpretations on the effects of the Tax Act and expects to complete its analysis within the measurement period in accordance with the SEC guidance. As a result of the Tax Act, the provisional amount recorded in December 2017 included a one-time deemed repatriation toll charge on the cumulative undistributed foreign earnings through 2017. In June 2018, the Company repatriated to the U.S. $1.6 billion of cumulative undistributed foreign earnings in the form of cash, cash equivalents, and investments of $1.4 billion and a note of $0.2 billion without significant incremental tax impact. The Company is still evaluating whether to change its indefinite reinvestment assertion for years after 2017 in light of the Tax Act. If the Company subsequently changes its assertion during the measurement period, the Company will account for the change in assertion as part of the Tax Act enactment.

As of June 30, 2018, the Company had a total of gross unrecognized tax benefits of $74.6 million compared with $65.4 million as of December 31, 2017, representing a net increase of approximately $9.2 million for the six months ended June 30, 2018. The net increase was primarily related to 2018 uncertain tax positions. If recognized, the gross unrecognized tax benefits would reduce the effective tax rate in the period of recognition.

The Company files federal, state, and foreign income tax returns in many U.S. and OUS jurisdictions. Years before 2015 are closed for the significant jurisdictions. Certain of the Company’s unrecognized tax benefits could change due to activities of various tax authorities, including potential assessment of additional tax, possible settlement of audits, or through normal expiration of various statutes of limitations, which could affect the Company’s effective tax rate in the period in which they change. Due to the uncertainty related to the timing and potential outcome of audits, the Company cannot estimate the range of reasonably possible change in unrecognized tax benefits that may occur in the next 12 months.

The Company is subject to the examination of its income tax returns by the Internal Revenue Service and other tax authorities. The outcome of these audits cannot be predicted with certainty. The Company’s management regularly assesses the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of the Company’s provision for income taxes. If any issues addressed in the Company’s tax audits are resolved in a manner not consistent with management’s expectations, the Company could be required to adjust its provision for income taxes in the period such resolution occurs.

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NET INCOME PER SHARE

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

NET INCOME PER SHARE

NET INCOME PER SHARE

The following table presents the computation of basic and diluted net income per share attributable to Intuitive Surgical, Inc. for the three and six months ended June 30, 2018, and 2017 (in millions, except per share amounts):

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2018		2017		2018		2017
Numerator:
Net income attributable to Intuitive Surgical, Inc.	$	255.3	$	223.0	$	542.9	$	403.8
Denominator:
Weighted average shares outstanding used in basic calculation	113.5		111.0		113.2		111.6
Add: dilutive effect of potential common shares	5.0		4.2		5.1		3.9
Weighted average shares outstanding used in diluted calculation	118.5		115.2		118.3		115.5
Net income per share attributable to Intuitive Surgical, Inc.:
Basic	$	2.25	$	2.01	$	4.80	$	3.62
Diluted	$	2.15	$	1.94	$	4.59	$	3.50

Share-based compensation awards of approximately 0.3 million and 0.3 million shares for the three months ended June 30, 2018, and 2017, respectively, and approximately 0.2 million and 0.7 million shares for the six months ended June 30, 2018, and 2017, respectively, were outstanding, but were not included in the computation of diluted net income per share attributable to Intuitive Surgical, Inc. common stockholders because the effect of including such shares would have been anti-dilutive in the periods presented.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements (“Financial Statements”) of Intuitive Surgical, Inc. and its wholly- and majority-owned subsidiaries have been prepared on a consistent basis with the audited Consolidated Financial Statements for the fiscal year ended December 31, 2017, and include all adjustments, consisting of only normal recurring adjustments, necessary to fairly state the information set forth herein. The Financial Statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) and therefore, omit certain information and footnote disclosure necessary to present the Financial Statements in accordance with accounting principles generally accepted in the United States (“U.S.”) (“U.S. GAAP”). These Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, which was filed with the SEC on February 2, 2018. The results of operations for the first six months of fiscal year 2018 are not necessarily indicative of the results to be expected for the entire fiscal year or any future periods.

Recent Accounting Pronouncements

Recent Accounting Pronouncements Not Yet Adopted

In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases (Topic 842), which amends the existing accounting standards for leases. The new standard requires lessees to record a right-of-use asset and a corresponding lease liability on the balance sheet (with the exception of short-term leases). The new standard also requires expanded disclosures regarding leasing arrangements. The new standard becomes effective for the Company in the first quarter of fiscal year 2019 and early adoption is permitted. The new standard is required to be adopted using the modified retrospective approach and requires application of the new standard at the beginning of the earliest comparative period presented. The Company generally does not finance purchases of equipment or other capital, but does lease some of its facilities. The Company’s customers finance purchases of da Vincisystems and ancillary products, including directly with the Company. It is currently unknown whether the new standard will change customer buying patterns or behaviors. The Company is evaluating the effect that this new standard will have on its Financial Statements and related disclosures.

Adopted Accounting Pronouncement

Revenue from Contracts with Customers

The Company adopted FASB Accounting Standards Codification Topic 606 (“ASC 606”), Revenue from Contracts with Customers in the first quarter of the Company’s fiscal year that began on January 1, 2018, using the full retrospective method, which required the Company to restate each prior reporting period presented. This new standard replaced the previous revenue recognition guidance in U.S. GAAP. Please see the Company’s “Revenue Recognition” policy in the “Significant Accounting Policies” section below.

The areas impacted include future contractual billings related to services included in the Company’s multi-year contracts, which are considered performance obligations that should be part of the contract consideration allocated to all performance obligations rather than being excluded due to its contingent nature as required under the previous revenue standard. Accordingly, the amount of contract consideration allocated to the performance obligations identified in the Company’s system arrangements is different from the amounts allocated under the previous revenue standard. In general, revenue is recognized earlier as a greater amount of the contract consideration is allocated to the product-related performance obligations that generally are delivered upfront, and therefore, less consideration is allocated to the service performance obligation that is generally recognized over the service period.

In addition, the Company recognized an asset associated with the incremental costs of obtaining revenue generating customer contracts that it expects to benefit from over a period longer than one year. The Company capitalized sales commissions paid in connection with system sale arrangements that include multi-year service obligations and is amortizing such asset over the economic life of those contracts. Previously, sales commissions were expensed as incurred. The impact of this change on operating expenses in any given period will depend, in part, on the amount of such commissions incurred and capitalized in relation to the amount of ongoing amortization expense.

Adoption of the standard using the full retrospective method also required the Company to restate certain previously reported results, including the impact to provision for income taxes. The adjustments to the unaudited Condensed Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2017, are as follows (in millions, except per share amounts):

	Three Months Ended June 30, 2017							Six Months Ended June 30, 2017
	As Previously Reported		Adjustments			As Restated		As Previously Reported		Adjustments			As Restated
Revenue:
Product	$	614.2	$	4.7		$	618.9	$	1,148.2	$	12.3		$	1,160.5
Service	142.0		(2.1		)	139.9		282.2		(4.3		)	277.9
Total revenue	756.2		2.6			758.8		1,430.4		8.0			1,438.4
Cost of revenue:
Product	184.3		0.4			184.7		348.1		2.1			350.2
Service	44.0		—			44.0		88.3		—			88.3
Total cost of revenue	228.3		0.4			228.7		436.4		2.1			438.5
Gross profit	527.9		2.2			530.1		994.0		5.9			999.9
Operating expenses:
Selling, general and administrative	185.8		(0.2		)	185.6		386.9		1.6			388.5
Research and development	84.6		—			84.6		158.1		—			158.1
Total operating expenses	270.4		(0.2		)	270.2		545.0		1.6			546.6
Income from operations	257.5		2.4			259.9		449.0		4.3			453.3
Interest and other income, net	10.1		—			10.1		18.8		—			18.8
Income before taxes	267.6		2.4			270.0		467.8		4.3			472.1
Income tax expense	46.1		0.9			47.0		66.5		1.8			68.3
Net income attributable to Intuitive Surgical, Inc.	$	221.5	$	1.5		$	223.0	$	401.3	$	2.5		$	403.8
Net income per share attributable to Intuitive Surgical, Inc.:
Basic	$	2.00	$	0.01		$	2.01	$	3.60	$	0.02		$	3.62
Diluted	$	1.92	$	0.02		$	1.94	$	3.47	$	0.03		$	3.50
Total comprehensive income attributable to Intuitive Surgical, Inc.	$	219.7	$	1.5		$	221.2	$	400.4	$	2.5		$	402.9

Selected Condensed Consolidated Statements of Balance Sheet line items, which reflect the impact of adopting the new standard, are as follow (in millions) as of December 31, 2017:

	December 31, 2017
	As Previously Reported		Adjustments			As Restated
ASSETS
Accounts receivable, net	$	511.9	$	(4.0	)	$	507.9
Prepaids and other current assets	$	97.2	$	2.0		$	99.2
Deferred tax assets	$	87.3	$	(15.3	)	$	72.0
Intangibles and other assets, net	$	159.7	$	36.1		$	195.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue	$	284.5	$	(40.7	)	$	243.8
Other accrued liabilities	$	169.5	$	(0.6	)	$	168.9
Other long-term liabilities	$	327.1	$	6.5		$	333.6
Retained earnings	$	61.4	$	53.6		$	115.0

In addition, the cumulative effect of ASC 606 to the Company’s retained earnings at January 1, 2016 was $40.3 million. Adoption of the standard had no impact to total net cash from or used in operating, investing, or financing activities within the Condensed Consolidated Statements of Cash Flows.

As part of the Company’s adoption of ASC 606, the Company elected to use the following practical expedients (i) to exclude disclosures of transaction prices allocated to remaining performance obligations when the Company expects to recognize such revenue for all periods prior to the date of initial application of ASC 606; (ii) not to adjust the promised amount of consideration for the effects of a significant financing component when the Company expects, at contract inception, that the period between the Company’s transfer of a promised product or service to a customer and when the customer pays for that product or service will be one year or less; (iii) to expense costs as incurred for costs to obtain a contract when the amortization period would have been one year or less; (iv) not to recast revenue for contracts that begin and end in the same fiscal year; and (v) not to assess whether promised goods or services are performance obligations if they are immaterial in the context of the contract with the customer.

Intra-Entity Transfer of Assets Other than Inventory

Beginning fiscal 2018, the Company adopted ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfer of Assets Other than Inventory, which requires the recognition of the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The Company adopted this standard using the modified retrospective approach, and as a result, recorded a deferred tax asset with a corresponding cumulative adjustment to retained earnings of $390.8 million as of January 1, 2018, associated with an intra-entity transfer of certain intellectual property rights related to the Company’s non-U.S. business to its Swiss entity. The adjustment may be materially different as a result of recording additional deferred taxes upon finalization of the assessment of global intangible low-taxed income and other aspects from additional guidance and interpretations by U.S. regulatory and standard-setting bodies related to the Tax Cuts and Jobs Act (the “Tax Act”) enacted on December 22, 2017.

Business Combinations: Clarifying the Definition of a Business

Beginning fiscal 2018, the Company adopted ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which clarifies the definition of a business to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses, and applied the new guidance prospectively. In the second quarter of 2018, the Company acquired certain assets related to a distribution business which was accounted for as a business combination. Refer to “Note 4. Balance Sheet Details and Other Information” for further information on the acquisition.

Statement of Cash Flow: Restricted Cash

Beginning fiscal 2018, the Company adopted ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which requires the statement of cash flows to explain the change during the period relating to total cash, cash equivalents, and restricted cash. The Company adopted this standard using the retrospective transition method by restating its condensed consolidated statements of cash flows to include restricted cash of $15.0 million in the beginning and ending cash, cash equivalents, and restricted cash balances for all periods presented. Net cash flows for the six months ended June 30, 2017, did not change as a result of including restricted cash with cash and cash equivalents when reconciling the beginning-of-period and end-of-period amounts presented on the statements of cash flows. Restricted cash was included in intangible and other assets, net on the Company’s condensed consolidated balance sheets.

Revenue Recognition

Revenue Recognition

The Company adopted ASC Topic 606, Revenue from Contracts with Customers, on January 1, 2018. The Company’s revenue consists of product revenue resulting from the sale of systems, system components, instruments and accessories, and service revenue. The Company accounts for a contract with a customer when there is a legally enforceable contract between the Company and its customer, the rights of the parties are identified, the contract has commercial substance, and collectability of the contract consideration is probable. The Company’s revenues are measured based on the consideration specified in the contract with each customer, net of any sales incentives and taxes collected from customers that are remitted to government authorities.

The Company’s system sale arrangements generally contain multiple products and services. For these bundled sale arrangements, the Company accounts for individual products and services as separate performance obligations if they are a distinct product or service that is separately identifiable from other items in a bundled package, and if a customer can benefit from the product or service on its own or with other resources that are readily available to the customer. The Company’s system sale arrangements include a combination of the following performance obligations: system(s), system components, system accessories, instruments, accessories, and system service. The Company’s system sale arrangements generally include a five-year period of service. The first year of service is generally free and included in the system sale arrangement and the remaining four years are generally included at a stated service price. The Company considers the service terms in the arrangements that are legally enforceable to be performance obligations. Other than service, the Company generally satisfies all of the performance obligations up-front. System components, system accessories, instruments, accessories, and service are also sold on a stand-alone basis.

The Company recognizes revenues as the performance obligations are satisfied by transferring control of the product or service to a customer. The Company generally recognizes revenue for the performance obligations at the following points in time:

•System sales. For systems, system components, and system accessories sold directly to end customers, revenue is recognized when the Company transfers control to the customer, which is generally at the point when acceptance occurs that indicates customer acknowledgment of delivery or installation, depending on the terms of the arrangement. For systems sold through distributors, revenue is recognized generally at the time of shipment. The Company’s system arrangements generally do not provide a right of return. The systems are generally covered by a one-year warranty. Warranty costs were not material for the periods presented.

•Instruments and accessories. Revenue from sales of instruments and accessories is recognized when control is transferred to the customers, which generally occurs at the time of shipment, but also occurs at the time of delivery depending on the customer arrangement. The Company allows its customers in the normal course of business to return unused products for a limited period of time subsequent to initial purchase and records an allowance against revenue for estimated returns.

•Service. Service revenue is recognized ratably over the term of the service period as the customers benefit from the service throughout the service period. Revenue related to services performed on a time-and-materials basis is recognized when performed.

The Company offers its customers the opportunity to trade in their older systems for a credit towards the purchase of a newer generation system. The Company generally does not provide specified price trade-in rights or upgrade rights at the time of system purchase. Such trade-in or upgrade transactions are separately negotiated based on the circumstances at the time of the trade-in or upgrade, based on the then fair value of the system, and are generally not based on any pre-existing rights granted by the Company. Accordingly, such trade-ins and upgrades are not considered as separate performance obligations in the arrangement for a system sale.

As part of a trade-in transaction, the customer receives a new generation system in exchange for its pre-owned system. The trade-in credit is negotiated at the time of the trade-in and is applied towards the purchase price of the new unit. Traded-in systems generally can be reconditioned and resold. The Company accounts for the fair value of the traded-in system in the total consideration in the arrangement by including the net realizable value of the traded-in system less a normal profit margin. The value of the traded-in system is determined as the amount, after reconditioning costs are added, that will allow a normal profit margin on the sale of the reconditioned unit to be generated. When there is no market for the traded-in units, no value is assigned. Traded-in units are reported as a component of inventory until resold, or otherwise disposed.

In addition, customers may also have the opportunity to upgrade their systems at a price determined at the time of the upgrade, for example, by adding a second surgeon console for use with the da Vinci Si, Xi,andXSurgical System. Such upgrades are performed by completing component level upgrades at the customer’s site. Upgrade revenue is recognized when the component level upgrades are complete and all revenue recognition criteria are met.

For multiple-element arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price. Standalone selling prices are based on observable prices at which the Company separately sells the products or services. If a standalone selling price is not directly observable, then the Company estimates the standalone selling price considering market conditions and entity-specific factors including, but not limited to, features and functionality of the products and services, geographies, and type of customer. The Company regularly reviews standalone selling prices and updates these estimates as necessary.

Assets Recognized from the Costs to Obtain a Contract with a Customer

Assets Recognized from the Costs to Obtain a Contract with a Customer

The Company has determined that certain sales incentives provided to the Company’s sales team meet the requirements to be capitalized when the Company expects to generate future economic benefits from the related revenue generating contracts subsequent to the initial capital sales transaction. When determining the economic life of the contract acquisition assets recognized, the Company considers historical service renewal rates, expectations of future customer renewals of service contracts, and other factors that could impact the economic benefits that the Company expects to generate from the relationship with its customers.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Schedule of Impact of Adopting New Standard

Adoption of the standard using the full retrospective method also required the Company to restate certain previously reported results, including the impact to provision for income taxes. The adjustments to the unaudited Condensed Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2017, are as follows (in millions, except per share amounts):

	Three Months Ended June 30, 2017							Six Months Ended June 30, 2017
	As Previously Reported		Adjustments			As Restated		As Previously Reported		Adjustments			As Restated
Revenue:
Product	$	614.2	$	4.7		$	618.9	$	1,148.2	$	12.3		$	1,160.5
Service	142.0		(2.1		)	139.9		282.2		(4.3		)	277.9
Total revenue	756.2		2.6			758.8		1,430.4		8.0			1,438.4
Cost of revenue:
Product	184.3		0.4			184.7		348.1		2.1			350.2
Service	44.0		—			44.0		88.3		—			88.3
Total cost of revenue	228.3		0.4			228.7		436.4		2.1			438.5
Gross profit	527.9		2.2			530.1		994.0		5.9			999.9
Operating expenses:
Selling, general and administrative	185.8		(0.2		)	185.6		386.9		1.6			388.5
Research and development	84.6		—			84.6		158.1		—			158.1
Total operating expenses	270.4		(0.2		)	270.2		545.0		1.6			546.6
Income from operations	257.5		2.4			259.9		449.0		4.3			453.3
Interest and other income, net	10.1		—			10.1		18.8		—			18.8
Income before taxes	267.6		2.4			270.0		467.8		4.3			472.1
Income tax expense	46.1		0.9			47.0		66.5		1.8			68.3
Net income attributable to Intuitive Surgical, Inc.	$	221.5	$	1.5		$	223.0	$	401.3	$	2.5		$	403.8
Net income per share attributable to Intuitive Surgical, Inc.:
Basic	$	2.00	$	0.01		$	2.01	$	3.60	$	0.02		$	3.62
Diluted	$	1.92	$	0.02		$	1.94	$	3.47	$	0.03		$	3.50
Total comprehensive income attributable to Intuitive Surgical, Inc.	$	219.7	$	1.5		$	221.2	$	400.4	$	2.5		$	402.9

Selected Condensed Consolidated Statements of Balance Sheet line items, which reflect the impact of adopting the new standard, are as follow (in millions) as of December 31, 2017:

	December 31, 2017
	As Previously Reported		Adjustments			As Restated
ASSETS
Accounts receivable, net	$	511.9	$	(4.0	)	$	507.9
Prepaids and other current assets	$	97.2	$	2.0		$	99.2
Deferred tax assets	$	87.3	$	(15.3	)	$	72.0
Intangibles and other assets, net	$	159.7	$	36.1		$	195.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue	$	284.5	$	(40.7	)	$	243.8
Other accrued liabilities	$	169.5	$	(0.6	)	$	168.9
Other long-term liabilities	$	327.1	$	6.5		$	333.6
Retained earnings	$	61.4	$	53.6		$	115.0

Revenue Disaggregated by Types and Geography

The following table presents revenue disaggregated by types and geography (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
U.S.	2018		2017		2018		2017
Instruments and accessories	$	360.3	$	309.4	$	697.9	$	597.0
Systems	172.4		141.3		296.4		246.7
Services	112.0		101.9		222.8		203.7
Total U.S. revenue	$	644.7	$	552.6	$	1,217.1	$	1,047.4
Outside of U.S. (“OUS”)
Instruments and accessories	$	115.8	$	88.4	$	238.5	$	181.6
Systems	105.0		79.8		215.5		135.2
Services	43.8		38.0		85.7		74.2
Total OUS revenue	$	264.6	$	206.2	$	539.7	$	391.0
Total
Instruments and accessories	$	476.1	$	397.8	$	936.4	$	778.6
Systems	277.4		221.1		511.9		381.9
Services	155.8		139.9		308.5		277.9
Total revenue	$	909.3	$	758.8	$	1,756.8	$	1,438.4

Summary of Contract Assets and Liabilities

The following information summarizes the Company’s contract assets and liabilities (in millions):

	As of
	June 30, 2018		December 31, 2017
Contract assets	$	11.1	$	8.3
Deferred revenue	$	302.2	$	268.6

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FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2018

Investments, All Other Investments [Abstract]

Summary of Cash and Available-For-Sale Securities

The following tables summarize the Company’s cash and available-for-sale marketable securities’ amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category reported as cash and cash equivalents, short-term, or long-term investments as of June 30, 2018, and December 31, 2017 (in millions):

										Reported as:
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short- term Investments		Long- term Investments
June 30, 2018
Cash	$	242.0	$	—	$	—		$	242.0	$	242.0	$	—	$	—
Level 1:
Money market funds	738.7		—		—			738.7		738.7		—		—
U.S. treasuries	1,192.5		—		(8.1		)	1,184.4		63.4		627.2		493.8
Subtotal	1,931.2		—		(8.1		)	1,923.1		802.1		627.2		493.8
Level 2:
Commercial paper	170.2		—		—			170.2		112.9		57.3		—
Corporate debt securities	1,036.2		0.4		(6.1		)	1,030.5		3.2		581.1		446.2
U.S. government agencies	882.3		0.2		(6.2		)	876.3		43.3		454.1		378.9
Municipal securities	17.5		—		—			17.5		—		9.3		8.2
Subtotal	2,106.2		0.6		(12.3		)	2,094.5		159.4		1,101.8		833.3
Total assets measured at fair value	$	4,279.4	$	0.6	$	(20.4	)	$	4,259.6	$	1,203.5	$	1,729.0	$	1,327.1

										Reported as:
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short- term Investments		Long- term Investments
December 31, 2017
Cash	$	197.7	$	—	$	—		$	197.7	$	197.7	$	—	$	—
Level 1:
Money market funds	445.0		—		—			445.0		445.0		—		—
U.S. treasuries	1,029.1		—		(4.7		)	1,024.4		5.5		396.2		622.7
Subtotal	1,474.1		—		(4.7		)	1,469.4		450.5		396.2		622.7
Level 2:
Commercial paper	38.4		—		—			38.4		—		38.4		—
Corporate debt securities	946.6		0.2		(4.4		)	942.4		—		403.9		538.5
U.S. government agencies	901.3		—		(4.4		)	896.9		—		311.7		585.2
Non-U.S. government securities	2.5		—		—			2.5		—		2.5		—
Municipal securities	301.1		—		(1.9		)	299.2		—		159.7		139.5
Subtotal	2,189.9		0.2		(10.7		)	2,179.4		—		916.2		1,263.2
Total assets measured at fair value	$	3,861.7	$	0.2	$	(15.4	)	$	3,846.5	$	648.2	$	1,312.4	$	1,885.9

Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments

The following table summarizes the contractual maturities of the Company’s cash equivalents and available-for-sale investments (excluding cash and money market funds), as of June 30, 2018 (in millions):

	Amortized Cost		Fair Value
Mature in less than one year	$	1,957.5	$	1,951.8
Mature in one to five years	1,341.2		1,327.1
Total	$	3,298.7	$	3,278.9

Gross Notional Amounts for Derivatives and Aggregate Gross Fair Value Outstanding

The notional amounts for derivative instruments provide one measure of the transaction volume. Total gross notional amounts (in USD) for outstanding derivatives and aggregate gross fair value at the end of each period were as follows (in millions):

	Derivatives Designated as Hedging Instruments				Derivatives Not Designated as Hedging Instruments
	June 30, 2018		December 31, 2017		June 30, 2018		December 31, 2017
Notional amounts:
Forward contracts	$	138.1	$	128.5	$	143.3	$	168.4
Gross fair value recorded in:
Prepaids and other current assets	$	4.5	$	0.9	$	2.9	$	1.2
Other accrued liabilities	$	0.8	$	2.9	$	0.8	$	4.6

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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Inventory Details

The following tables provide details of selected balance sheet items (in millions):

	As of
Inventory	June 30, 2018		December 31, 2017
Raw materials	$	129.5	$	80.9
Work-in-process	35.9		19.7
Finished goods	166.1		140.6
Total inventory	$	331.5	$	241.2

Other Accrued Liabilities - Short-term

	As of
Other accrued liabilities - short-term	June 30, 2018		December 31, 2017
Taxes payable	$	17.9	$	63.1
Litigation related accruals	59.8		13.8
Other accrued liabilities	86.4		92.0
Total other accrued liabilities—short-term	$	164.1	$	168.9

Other Long-term Liabilities

	As of
Other long-term liabilities	June 30, 2018		December 31, 2017
Income taxes—long-term	$	262.5	$	286.8
Deferred revenue—long-term	30.1		24.8
Other long-term liabilities	21.4		22.0
Total other long-term liabilities	$	314.0	$	333.6

Supplemental Cash Flow Information

The following table provides supplemental non-cash investing activities (in millions):

	Six Months Ended June 30,
	2018		2017
Equipment transfers, including operating lease assets, from inventory to property, plant, and equipment	$	49.0	$	29.6

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LEASE RECEIVABLES (Tables)

6 Months Ended

Jun. 30, 2018

Leases [Abstract]

Schedule of Lease Receivables

Lease receivables relating to sales-type lease arrangements are presented on the Condensed Consolidated Balance Sheets as follows (in millions):

	As of
	June 30, 2018			December 31, 2017
Gross lease receivables	$	132.8		$	128.0
Unearned income	(5.1		)	(5.0		)
Allowance for credit loss	(1.0		)	(0.9		)
Net investment in sales-type leases	$	126.7		$	122.1
Reported as:
Prepaids and other current assets	$	47.2		$	41.9
Intangible and other assets, net	79.5			80.2
Total, net	$	126.7		$	122.1

Schedule of Contractual Maturities of Gross Lease Receivables

Contractual maturities of gross lease receivables at June 30, 2018, are as follows (in millions):

	Amount
2018	$	21.7
2019	45.2
2020	34.6
2021	18.7
2022	10.1
2023 and thereafter	2.5
Total	$	132.8

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STOCKHOLDERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Components of Accumulated Other Comprehensive Income, Net of Tax

The components of accumulated other comprehensive income (loss), net of tax, for the three and six months ended June 30, 2018, and 2017, are as follows (in millions):

	Three Months Ended June 30, 2018
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	(3.2	)	$	(17.5	)	$	6.8		$	(4.2	)	$	(18.1	)
Other comprehensive income (loss) before reclassifications	6.2			0.8			(5.9		)	(0.3		)	0.8
Amounts reclassified from accumulated other comprehensive income (loss)	0.4			—			—			0.5			0.9
Net current-period other comprehensive income (loss)	6.6			0.8			(5.9		)	0.2			1.7
Ending balance	$	3.4		$	(16.7	)	$	0.9		$	(4.0	)	$	(16.4	)
	Three Months Ended June 30, 2017
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	1.1		$	(5.8	)	$	0.5		$	(3.8	)	$	(8.0	)
Other comprehensive income (loss) before reclassifications	(3.0		)	0.4			0.5			—			(2.1		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			0.1			—			0.2			0.3
Net current-period other comprehensive income (loss)	(3.0		)	0.5			0.5			0.2			(1.8		)
Ending balance	$	(1.9	)	$	(5.3	)	$	1.0		$	(3.6	)	$	(9.8	)

	Six Months Ended June 30, 2018
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	(2.4	)	$	(11.3	)	$	2.3		$	(4.1	)	$	(15.5	)
Other comprehensive income (loss) before reclassifications	3.2			(6.6		)	(1.4		)	—			(4.8		)
Amounts reclassified from accumulated other comprehensive income (loss)	2.6			1.2			—			0.1			3.9
Net current-period other comprehensive income (loss)	5.8			(5.4		)	(1.4		)	0.1			(0.9		)
Ending balance	$	3.4		$	(16.7	)	$	0.9		$	(4.0	)	$	(16.4	)
	Six Months Ended June 30, 2017
	Gains (Losses) on Hedge Instruments			Unrealized Gains (Losses) on Available-for-Sale Securities			Foreign Currency Translation Gains (Losses)			Employee Benefit Plans			Total
Beginning balance	$	5.0		$	(8.6	)	$	(1.3	)	$	(4.0	)	$	(8.9	)
Other comprehensive income (loss) before reclassifications	(5.1		)	3.3			2.3			0.1			0.6
Amounts reclassified from accumulated other comprehensive income (loss)	(1.8		)	—			—			0.3			(1.5		)
Net current-period other comprehensive income (loss)	(6.9		)	3.3			2.3			0.4			(0.9		)
Ending balance	$	(1.9	)	$	(5.3	)	$	1.0		$	(3.6	)	$	(9.8	)

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SHARE-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Option Activity Under All Stock Plans

A summary of stock option activity under all stock plans for the six months ended June 30, 2018, is presented as follows (in millions, except per share amounts):

	Stock Options Outstanding
	Number Outstanding		Weighted Average Exercise Price Per Share
Balance at December 31, 2017	7.2		$	164.16
Granted	0.3		$	422.16
Exercised	(0.9	)	$	123.78
Forfeited/expired	(0.1	)	$	209.31
Balance at June 30, 2018	6.5		$	179.88

Summary of RSU Activity

A summary of RSU activity for the six months ended June 30, 2018, is presented as follows (in millions, except per share amounts):

	Shares		Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2017	2.1		$	209.55
Granted	0.8		$	419.66
Vested	(0.7	)	$	191.87
Forfeited	(0.1	)	$	257.10
Unvested balance at June 30, 2018	2.1		$	284.65

Summary of Share-Based Compensation Expense

The following table summarizes share-based compensation expense for the three and six months ended June 30, 2018, and 2017 (in millions):

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2018		2017		2018		2017
Cost of sales - products	$	8.9	$	6.7	$	17.1	$	13.5
Cost of sales - services	4.1		3.5		8.0		6.7
Total cost of sales	13.0		10.2		25.1		20.2
Selling, general and administrative	32.7		26.6		62.2		52.3
Research and development	17.9		13.8		34.2		25.7
Share-based compensation expense before income taxes	63.6		50.6		121.5		98.2
Income tax benefit	12.8		16.4		25.1		31.9
Share-based compensation expense after income taxes	$	50.8	$	34.2	$	96.4	$	66.3

Schedule of Estimated Fair Value of the Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions

The Black-Scholes option pricing model is used to estimate the fair value of stock options granted under the Company’s stock plans and rights to acquire stock granted under the Company’s ESPP. The weighted average estimated fair values of stock options and rights to acquire stock under the ESPP, as well as the weighted average assumptions used in calculating those fair values, were as follows:

	Three Months Ended   June 30,						Six Months Ended   June 30,
	2018			2017			2018			2017
Stock Options
Risk-free interest rate	2.7		%	1.8		%	2.6		%	2.0		%
Expected term (in years)	4.2			4.2			4.3			4.3
Expected volatility	33		%	22		%	33		%	24		%
Fair value at grant date	$	139.43		$	59.91		$	131.53		$	57.04
ESPP
Risk-free interest rate	—			—			1.9		%	0.9		%
Expected term (in years)	—			—			1.2			1.3
Expected volatility	—			—			32		%	26		%
Fair value at grant date	—			—			$	124.61		$	61.59

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NET INCOME PER SHARE (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Income Per Share

The following table presents the computation of basic and diluted net income per share attributable to Intuitive Surgical, Inc. for the three and six months ended June 30, 2018, and 2017 (in millions, except per share amounts):

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2018		2017		2018		2017
Numerator:
Net income attributable to Intuitive Surgical, Inc.	$	255.3	$	223.0	$	542.9	$	403.8
Denominator:
Weighted average shares outstanding used in basic calculation	113.5		111.0		113.2		111.6
Add: dilutive effect of potential common shares	5.0		4.2		5.1		3.9
Weighted average shares outstanding used in diluted calculation	118.5		115.2		118.3		115.5
Net income per share attributable to Intuitive Surgical, Inc.:
Basic	$	2.25	$	2.01	$	4.80	$	3.62
Diluted	$	2.15	$	1.94	$	4.59	$	3.50

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 948.1		$ 948.1			$ 115.0
Restricted cash	15.0		$ 15.0
Total period of service			5 years
Additional period of service after first free year			4 years
General warranty period			1 year
Price allocated to remaining performance obligations	1,264.0		$ 1,264.0
Revenue recognized	82.0	$ 68.2	197.8	$ 166.7
Costs capitalized as contract acquisition costs	$ 31.0		$ 31.0			31.4
ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings						$ 115.0
ASC 606 | Difference between revenue euidance in effect before and after topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings							$ 40.3
ASU 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative catch-up adjustment to retained earnings					$ 390.8

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact of Adopting New Standard (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue:
Product	$ 753.5	$ 618.9	$ 1,448.3	$ 1,160.5
Service	155.8	139.9	308.5	277.9
Total revenue	909.3	758.8	1,756.8	1,438.4
Cost of revenue:
Product	228.1	184.7	429.6	350.2
Service	48.9	44.0	101.1	88.3
Total cost of revenue	277.0	228.7	530.7	438.5
Gross profit	632.3	530.1	1,226.1	999.9
Operating expenses:
Selling, general and administrative	259.8	185.6	481.4	388.5
Research and development	95.1	84.6	190.6	158.1
Total operating expenses	354.9	270.2	672.0	546.6
Income from operations	277.4	259.9	554.1	453.3
Interest and other income, net	18.2	10.1	31.4	18.8
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	295.6	270.0	585.5	472.1
Income tax expense	41.0	47.0	43.6	68.3
Net income attributable to Intuitive Surgical, Inc.	$ 255.3	$ 223.0	$ 542.9	$ 403.8
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)	$ 2.25	$ 2.01	$ 4.80	$ 3.62
Diluted (in dollars per share)	$ 2.15	$ 1.94	$ 4.59	$ 3.50
Total comprehensive income attributable to Intuitive Surgical, Inc.	$ 257.0	$ 221.2	$ 542.0	$ 402.9
ASSETS
Accounts receivable, net	532.5		532.5		$ 507.9
Prepaids and other current assets	189.6		189.6		99.2
Deferred tax assets	415.4		415.4		72.0
Intangible and other assets, net	221.3		221.3		195.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue	272.1		272.1		243.8
Other accrued liabilities	164.1		164.1		168.9
Retained earnings	$ 948.1		$ 948.1		115.0
ASC 606
Revenue:
Product		618.9		1,160.5
Service		139.9		277.9
Total revenue		758.8		1,438.4
Cost of revenue:
Product		184.7		350.2
Service		44.0		88.3
Total cost of revenue		228.7		438.5
Gross profit		530.1		999.9
Operating expenses:
Selling, general and administrative		185.6		388.5
Research and development		84.6		158.1
Total operating expenses		270.2		546.6
Income from operations		259.9		453.3
Interest and other income, net		10.1		18.8
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		270.0		472.1
Income tax expense		47.0		68.3
Net income attributable to Intuitive Surgical, Inc.		$ 223.0		$ 403.8
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)		$ 2.01		$ 3.62
Diluted (in dollars per share)		$ 1.94		$ 3.50
Total comprehensive income attributable to Intuitive Surgical, Inc.		$ 221.2		$ 402.9
ASSETS
Accounts receivable, net					507.9
Prepaids and other current assets					99.2
Deferred tax assets					72.0
Intangible and other assets, net					195.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue					243.8
Other accrued liabilities					168.9
Other long-term liabilities					333.6
Retained earnings					115.0
ASC 606 | As Previously Reported
Revenue:
Product		614.2		1,148.2
Service		142.0		282.2
Total revenue		756.2		1,430.4
Cost of revenue:
Product		184.3		348.1
Service		44.0		88.3
Total cost of revenue		228.3		436.4
Gross profit		527.9		994.0
Operating expenses:
Selling, general and administrative		185.8		386.9
Research and development		84.6		158.1
Total operating expenses		270.4		545.0
Income from operations		257.5		449.0
Interest and other income, net		10.1		18.8
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		267.6		467.8
Income tax expense		46.1		66.5
Net income attributable to Intuitive Surgical, Inc.		$ 221.5		$ 401.3
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)		$ 2.00		$ 3.60
Diluted (in dollars per share)		$ 1.92		$ 3.47
Total comprehensive income attributable to Intuitive Surgical, Inc.		$ 219.7		$ 400.4
ASSETS
Accounts receivable, net					511.9
Prepaids and other current assets					97.2
Deferred tax assets					87.3
Intangible and other assets, net					159.7
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue					284.5
Other accrued liabilities					169.5
Other long-term liabilities					327.1
Retained earnings					61.4
ASC 606 | Adjustments
Revenue:
Product		4.7		12.3
Service		(2.1)		(4.3)
Total revenue		2.6		8.0
Cost of revenue:
Product		0.4		2.1
Service		0.0		0.0
Total cost of revenue		0.4		2.1
Gross profit		2.2		5.9
Operating expenses:
Selling, general and administrative		(0.2)		1.6
Research and development		0.0		0.0
Total operating expenses		(0.2)		1.6
Income from operations		2.4		4.3
Interest and other income, net		0.0		0.0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		2.4		4.3
Income tax expense		0.9		1.8
Net income attributable to Intuitive Surgical, Inc.		$ 1.5		$ 2.5
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)		$ 0.01		$ 0.02
Diluted (in dollars per share)		$ 0.02		$ 0.03
Total comprehensive income attributable to Intuitive Surgical, Inc.		$ 1.5		$ 2.5
ASSETS
Accounts receivable, net					(4.0)
Prepaids and other current assets					2.0
Deferred tax assets					(15.3)
Intangible and other assets, net					36.1
LIABILITIES AND STOCKHOLDERS’ EQUITY
Deferred revenue					(40.7)
Other accrued liabilities					(0.6)
Other long-term liabilities					6.5
Retained earnings					$ 53.6

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Disaggregated by Types and Geography (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 909.3	$ 758.8	$ 1,756.8	$ 1,438.4
U.S.
Disaggregation of Revenue [Line Items]
Total revenue	644.7	552.6	1,217.1	1,047.4
Outside of U.S. (“OUS”)
Disaggregation of Revenue [Line Items]
Total revenue	264.6	206.2	539.7	391.0
Instruments and accessories
Disaggregation of Revenue [Line Items]
Total revenue	476.1	397.8	936.4	778.6
Instruments and accessories | U.S.
Disaggregation of Revenue [Line Items]
Total revenue	360.3	309.4	697.9	597.0
Instruments and accessories | Outside of U.S. (“OUS”)
Disaggregation of Revenue [Line Items]
Total revenue	115.8	88.4	238.5	181.6
Systems
Disaggregation of Revenue [Line Items]
Total revenue	277.4	221.1	511.9	381.9
Systems | U.S.
Disaggregation of Revenue [Line Items]
Total revenue	172.4	141.3	296.4	246.7
Systems | Outside of U.S. (“OUS”)
Disaggregation of Revenue [Line Items]
Total revenue	105.0	79.8	215.5	135.2
Services
Disaggregation of Revenue [Line Items]
Total revenue	155.8	139.9	308.5	277.9
Services | U.S.
Disaggregation of Revenue [Line Items]
Total revenue	112.0	101.9	222.8	203.7
Services | Outside of U.S. (“OUS”)
Disaggregation of Revenue [Line Items]
Total revenue	$ 43.8	$ 38.0	$ 85.7	$ 74.2

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Contract Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Contract assets	$ 11.1	$ 8.3
Contract with Customer, Liability	$ 302.2	$ 268.6

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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 4,279.4	$ 3,861.7
Gross Unrealized Gains	0.6	0.2
Gross Unrealized Losses	(20.4)	(15.4)
Fair Value	4,259.6	3,846.5
Cash and Cash Equivalents	1,203.5	648.2
Short- term Investments	1,729.0	1,312.4
Long- term Investments	1,327.1	1,885.9
Cash
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	242.0	197.7
Fair Value	242.0	197.7
Cash and Cash Equivalents	242.0	197.7
Level 1
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,931.2	1,474.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(8.1)	(4.7)
Fair Value	1,923.1	1,469.4
Cash and Cash Equivalents	802.1	450.5
Short- term Investments	627.2	396.2
Long- term Investments	493.8	622.7
Level 1 | Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	738.7	445.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	738.7	445.0
Cash and Cash Equivalents	738.7	445.0
Short- term Investments	0.0	0.0
Long- term Investments	0.0	0.0
Level 1 | U.S. treasuries
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,192.5	1,029.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(8.1)	(4.7)
Fair Value	1,184.4	1,024.4
Cash and Cash Equivalents	63.4	5.5
Short- term Investments	627.2	396.2
Long- term Investments	493.8	622.7
Level 2
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,106.2	2,189.9
Gross Unrealized Gains	0.6	0.2
Gross Unrealized Losses	(12.3)	(10.7)
Fair Value	2,094.5	2,179.4
Cash and Cash Equivalents	159.4	0.0
Short- term Investments	1,101.8	916.2
Long- term Investments	833.3	1,263.2
Level 2 | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	170.2	38.4
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	170.2	38.4
Cash and Cash Equivalents	112.9	0.0
Short- term Investments	57.3	38.4
Long- term Investments	0.0	0.0
Level 2 | Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,036.2	946.6
Gross Unrealized Gains	0.4	0.2
Gross Unrealized Losses	(6.1)	(4.4)
Fair Value	1,030.5	942.4
Cash and Cash Equivalents	3.2	0.0
Short- term Investments	581.1	403.9
Long- term Investments	446.2	538.5
Level 2 | U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	882.3	901.3
Gross Unrealized Gains	0.2	0.0
Gross Unrealized Losses	(6.2)	(4.4)
Fair Value	876.3	896.9
Cash and Cash Equivalents	43.3	0.0
Short- term Investments	454.1	311.7
Long- term Investments	378.9	585.2
Level 2 | Non-U.S. government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2.5
Gross Unrealized Gains		0.0
Gross Unrealized Losses		0.0
Fair Value		2.5
Cash and Cash Equivalents		0.0
Short- term Investments		2.5
Long- term Investments		0.0
Level 2 | Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17.5	301.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	(1.9)
Fair Value	17.5	299.2
Cash and Cash Equivalents	0.0	0.0
Short- term Investments	9.3	159.7
Long- term Investments	$ 8.2	$ 139.5

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FINANCIAL INSTRUMENTS - Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments (Details) $ in Millions	Jun. 30, 2018 USD ($)
Amortized Cost
Mature in less than one year	$ 1,957.5
Mature in one to five years	1,341.2
Total	3,298.7
Fair Value
Mature in less than one year	1,951.8
Mature in one to five years	1,327.1
Total	$ 3,278.9

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FINANCIAL INSTRUMENTS - Gross Notional Amounts for Outstanding Derivatives (Details) - Forward contracts - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivatives Designated as Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount, forward contracts	$ 138.1	$ 128.5
Gross fair value of derivative assets	4.5	0.9
Gross fair value of derivative liabilities	0.8	2.9
Derivatives Not Designated as Hedging Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount, forward contracts	143.3	168.4
Gross fair value of derivative assets	2.9	1.2
Gross fair value of derivative liabilities	$ 0.8	$ 4.6

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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Inventory (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 129.5	$ 80.9
Work-in-process	35.9	19.7
Finished goods	166.1	140.6
Total inventory	$ 331.5	$ 241.2

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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Other Accrued Liabilities - Short-term (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Taxes payable	$ 17.9	$ 63.1
Litigation related accruals	59.8	13.8
Other accrued liabilities	86.4	92.0
Total other accrued liabilities—short-term	$ 164.1	$ 168.9

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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Other Long-term Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Income taxes—long-term	$ 262.5	$ 286.8
Deferred revenue—long-term	30.1	24.8
Other long-term liabilities	21.4	22.0
Total other long-term liabilities	$ 314.0	$ 333.6

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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	May 25, 2018	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 210.9	$ 201.1
Vattikuti Technologies Pvt. Ltd.
Business Acquisition [Line Items]
Cash payments	$ 38.1
Net tangible assets acquired	4.1
Goodwill	9.8
Intangible assets acquired	$ 24.2
Weighted average useful life	4 years 3 months 18 days

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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Supplemental non-cash investing activities:
Equipment transfers, including operating lease assets, from inventory to property, plant, and equipment	$ 49.0	$ 29.6

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LEASE RECEIVABLES - Lease Receivables (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Capital Leased Assets [Line Items]
Gross lease receivables	$ 132.8	$ 128.0
Unearned income	(5.1)	(5.0)
Allowance for credit loss	(1.0)	(0.9)
Net investment in sales-type leases	126.7	122.1
Reported as:
Net investment in sales-type leases	126.7	122.1
Prepaids and other current assets
Reported as:
Prepaids and other current assets	47.2	41.9
Intangible and other assets, net
Reported as:
Intangible and other assets, net	$ 79.5	$ 80.2

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LEASE RECEIVABLES - Gross Contractual Maturities of Lease Receivables (Details) $ in Millions	Jun. 30, 2018 USD ($)
Leases [Abstract]
2018	$ 21.7
2019	45.2
2020	34.6
2021	18.7
2022	10.1
2023 and thereafter	2.5
Total	$ 132.8

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CONTINGENCIES (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jun. 11, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Commitments and Contingencies [Line Items]
Recorded pre-tax charges		$ 42,500,000		$ 47,000,000
Loss contingency liability		58,300,000		58,300,000
Settlement agreement payment	$ 42,500,000
Pre-tax loss		42,500,000		42,500,000
da Vinci Surgical System Product Liability Matters
Commitments and Contingencies [Line Items]
Loss contingency liability		15,800,000		15,800,000		$ 12,800,000
Estimated cost of settling product liability claims		$ 0	$ 2,500,000	$ 4,500,000	$ 16,000,000

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STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions		6 Months Ended
	Dec. 07, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock		$ 0	$ 2,000,000,000
Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Remaining amount of share repurchases authorized		717,500,000
ASR Program | Goldman
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock	$ 274,000,000		$ 2,000,000,000
Shares repurchased			7.3
Final average price per share paid (in dollars per share)	$ 310.32
Common Stock | Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Amount of share repurchases authorized		$ 6,200,000,000.0
Stock repurchase program, increased to authorized amount				$ 3,000,000,000.0

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STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gains (Losses) on Hedge Instruments
Beginning balance	$ (3.2)	$ 1.1	$ (2.4)	$ 5.0
Other comprehensive income (loss) before reclassifications	6.2	(3.0)	3.2	(5.1)
Amounts reclassified from accumulated other comprehensive income (loss)	0.4	0.0	2.6	(1.8)
Net current-period other comprehensive income (loss)	6.6	(3.0)	5.8	(6.9)
Ending balance	3.4	(1.9)	3.4	(1.9)
Unrealized Gains (Losses) on Available-for-Sale Securities
Beginning balance	(17.5)	(5.8)	(11.3)	(8.6)
Other comprehensive income (loss) before reclassifications	0.8	0.4	(6.6)	3.3
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.1	1.2	0.0
Net current-period other comprehensive income (loss)	0.8	0.5	(5.4)	3.3
Ending balance	(16.7)	(5.3)	(16.7)	(5.3)
Foreign Currency Translation Gains (Losses)
Beginning balance	6.8	0.5	2.3	(1.3)
Other comprehensive income (loss) before reclassifications	(5.9)	0.5	(1.4)	2.3
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0	0.0
Net current-period other comprehensive income (loss)	(5.9)	0.5	(1.4)	2.3
Ending balance	0.9	1.0	0.9	1.0
Employee Benefit Plans
Beginning balance	(4.2)	(3.8)	(4.1)	(4.0)
Other comprehensive income (loss) before reclassifications	(0.3)	0.0	0.0	0.1
Amounts reclassified from accumulated other comprehensive income (loss)	0.5	0.2	0.1	0.3
Net current-period other comprehensive income (loss)	0.2	0.2	0.1	0.4
Ending balance	(4.0)	(3.6)	(4.0)	(3.6)
Total
Beginning balance	(18.1)	(8.0)	(15.5)	(8.9)
Other comprehensive income (loss) before reclassifications	0.8	(2.1)	(4.8)	0.6
Amounts reclassified from accumulated other comprehensive income (loss)	0.9	0.3	3.9	(1.5)
Net current-period other comprehensive income (loss)	1.7	(1.8)	(0.9)	(0.9)
Ending balance	$ (16.4)	$ (9.8)	$ (16.4)	$ (9.8)
Shares withheld related to net share settlement of equity awards	5.2		101.9

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SHARE-BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance	4.7
Options exercisable, number of shares	5.2
Options exercisable, weighted-average exercise price (usd per share)	$ 155.63
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance	2.0
Forfeited (in shares)	(0.1)
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, number of shares purchased by employees	0.1	0.1
Employee Stock Purchase Plan, value of shares purchased by employees	$ 25.3	$ 20.9

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SHARE-BASED COMPENSATION - Summary Of Stock Option Activity Under All Stock Plans (Details) shares in Millions	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Number Outstanding
Beginning balance, Number Outstanding | shares	7.2
Options granted, Number Outstanding | shares	0.3
Options exercised, Number Outstanding | shares	(0.9)
Options forfeited/expired, Number Outstanding | shares	(0.1)
Ending balance, Number Outstanding | shares	6.5
Weighted Average Exercise Price Per Share
Beginning balance, Weighted Average Exercise Price Per Share | $ / shares	$ 164.16
Options granted, Weighted Average Exercise Price Per Share | $ / shares	422.16
Options exercised, Weighted Average Exercise Price Per Share | $ / shares	123.78
Options forfeited/expired, Weighted Average Exercise Price Per Share | $ / shares	209.31
Ending balance, Weighted Average Exercise Price Per Share | $ / shares	$ 179.88

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SHARE-BASED COMPENSATION - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs) shares in Millions	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Shares
Unvested beginning balance (in shares) | shares	2.1
Granted (in shares) | shares	0.8
Vested (in shares) | shares	(0.7)
Forfeited (in shares) | shares	(0.1)
Unvested ending balance (in shares) | shares	2.1
Weighted Average Grant Date Fair Value
Unvested beginning balance (usd per share) | $ / shares	$ 209.55
Granted (usd per share) | $ / shares	419.66
Vested (usd per share) | $ / shares	191.87
Forfeited (usd per share) | $ / shares	257.10
Unvested ending balance (usd per share) | $ / shares	$ 284.65

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SHARE-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	$ 63.6	$ 50.6	$ 121.5	$ 98.2
Income tax benefit	12.8	16.4	25.1	31.9
Share-based compensation expense after income taxes	50.8	34.2	96.4	66.3
Total cost of sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	13.0	10.2	25.1	20.2
Total cost of sales | Cost of sales - products
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	8.9	6.7	17.1	13.5
Total cost of sales | Cost of sales - services
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	4.1	3.5	8.0	6.7
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	32.7	26.6	62.2	52.3
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense before income taxes	$ 17.9	$ 13.8	$ 34.2	$ 25.7

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SHARE-BASED COMPENSATION - Schedule Of Estimated Fair Value Of Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.70%	1.80%	2.60%	2.00%
Expected term (in years)	4 years 2 months 12 days	4 years 2 months 12 days	4 years 3 months 18 days	4 years 3 months 18 days
Expected volatility (percent)	33.00%	22.00%	33.00%	24.00%
Weighted average fair value at grant date (usd per share)	$ 139.43	$ 59.91	$ 131.53	$ 57.04
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.00%	0.00%	1.90%	0.90%
Expected term (in years)	0 years	0 years	1 year 2 months 12 days	1 year 3 months 18 days
Expected volatility (percent)	0.00%	0.00%	32.00%	26.00%
Weighted average fair value at grant date (usd per share)	$ 0.00	$ 0.00	$ 124.61	$ 61.59

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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)		$ 41.0	$ 47.0	$ 43.6	$ 68.3
Income tax expense, percentage of pre-tax income		13.90%	17.40%	7.40%	14.50%
Effective tax rate		21.00%	35.00%
Provisional income tax expense						$ 317.8
Provisional estimate of minimum tax on foreign earnings		$ 6.4		$ 15.5
Repatriated undistributed foreign earnings	$ 1,600.0
Repatriated cash, cash equivalents and investments	1,400.0
Repatriated note	200.0
Total gross unrecognized tax benefits	$ 74.6	$ 74.6		74.6		$ 65.4
Net decrease of unrecognized tax benefits				$ (9.2)

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NET INCOME PER SHARE - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income attributable to Intuitive Surgical, Inc.	$ 255.3	$ 223.0	$ 542.9	$ 403.8
Denominator:
Weighted average shares outstanding used in basic calculation	113.5	111.0	113.2	111.6
Add: dilutive effect of potential common shares	5.0	4.2	5.1	3.9
Weighted average shares outstanding used in diluted calculation	118.5	115.2	118.3	115.5
Net income per share attributable to Intuitive Surgical, Inc.:
Basic (in dollars per share)	$ 2.25	$ 2.01	$ 4.80	$ 3.62
Diluted (in dollars per share)	$ 2.15	$ 1.94	$ 4.59	$ 3.50

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NET INCOME PER SHARE - Additional Information (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Employee stock options excluded from computation of diluted net income per share	0.3	0.3	0.2	0.7