10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

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

For the quarterly period ended June 30, 2017

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: 001-36112

MACROGENICS, INC.

(Exact name of registrant as specified in its charter)

Delaware	06-1591613
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
9704 Medical Center Drive Rockville, Maryland	20850
(Address of principal executive offices)	(Zip code)

301-251-5172

(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  ☒   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  ☒   No  ☐

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

Large accelerated filer	☒	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  ☒

As of July 31, 2017, the number of outstanding shares of the registrant's common stock, par value $0.01 per share, was 36,798,465 shares.

TABLE OF CONTENTS

PART I.	FINANCIAL INFORMATION
Item 1.	Financial Statements
	Consolidated Balance Sheets at June 30, 2017 (unaudited) and December 31, 2016
	Consolidated Statements of Operations and Comprehensive Income (Loss) for the three and six months ended June 30, 2017 and June 30, 2016 (unaudited)
	Consolidated Statements of Cash Flows for the six months ended June 30, 2017 and June 30, 2016 (unaudited)
	Notes to Consolidated Financial Statements (unaudited)
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations
Item 3.	Quantitative and Qualitative Disclosures about Market Risk
Item 4.	Controls and Procedures
PART II.	OTHER INFORMATION
Item 1A.	Risk Factors
Item 6.	Exhibits
	Signatures

FORWARD-LOOKING STATEMENTS

This report includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Forward-looking statements include statements that may relate to our plans, objectives, goals, strategies, future events, future revenues or performance, capital expenditures, financing needs and other information that is not historical information. Many of these statements appear, in particular, under the headings "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations". Forward-looking statements can often be identified by the use of terminology such as "subject to", "believe", "anticipate", "plan", "expect", "intend", "estimate", "project", "may", "will", "should", "would", "could", "can", the negatives thereof, variations thereon and similar expressions, or by discussions of strategy.

All forward-looking statements, including, without limitation, our examination of historical operating trends, are based upon our current expectations and various assumptions. We believe there is a reasonable basis for our expectations and beliefs, but they are inherently uncertain. We may not realize our expectations, and our beliefs may not prove correct. Actual results could differ materially from those described or implied by such forward-looking statements. The following uncertainties and factors, among others (including those set forth under "Risk Factors"), could affect future performance and cause actual results to differ materially from those matters expressed in or implied by forward-looking statements:

• our plans to develop and commercialize our product candidates;

• the outcomes of our ongoing and planned clinical trials and the timing of those outcomes;

• the timing of and our ability to obtain and maintain regulatory approvals for our product candidates;

• our estimates regarding expenses, future revenue, capital requirements and needs for additional financing;

• our ability to enter into new collaborations or to identify additional products or product candidates with significant commercial potential that are consistent with our commercial objectives;

• our ability to recover the investment in our manufacturing capabilities;

• the rate and degree of market acceptance and clinical utility of our products;

• our commercialization, marketing and manufacturing capabilities and strategy;

• significant competition in our industry;

• costs of litigation and the failure to successfully defend lawsuits and other claims against us;

• economic, political and other risks associated with our international operations;

• our ability to receive research funding and achieve anticipated milestones under our collaborations;

• our ability to protect and enforce patents and other intellectual property;

• costs of compliance and our failure to comply with new and existing governmental regulations including, but not limited to, tax regulations;

• loss or retirement of key members of management;

• failure to successfully execute our growth strategy, including any delays in our planned future growth; and

• our failure to maintain effective internal controls.

Consequently, forward-looking statements speak only as of the date that they are made and should be regarded solely as our current plans, estimates and beliefs. You should not place undue reliance on forward-looking statements. We cannot guarantee future results, events, levels of activity, performance or achievements. Except as required by law, we do not undertake and specifically decline any obligation to update, republish or revise forward-looking statements to reflect future events or circumstances or to reflect the occurrences of unanticipated events.

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

MACROGENICS, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share data)

	June 30, 2017			December 31, 2016
	(unaudited)
Assets
Current assets:
Cash and cash equivalents	$	116,627		$	84,098
Marketable securities	127,033			192,898
Accounts receivable	1,991			2,764
Prepaid expenses	4,008			3,483
Other current assets	455			704
Total current assets	250,114			283,947
Property and equipment, net	23,179			17,961
Marketable securities, non-current	—			7,986
Other assets	1,553			1,369
Total assets	$	274,846		$	311,263
Liabilities and stockholders' equity
Current liabilities:
Accounts payable	$	2,088		$	3,995
Accrued expenses	22,319			16,134
Deferred revenue	3,202			4,261
Deferred rent	1,160			1,319
Lease exit liability	1,120			1,593
Total current liabilities	29,889			27,302
Deferred revenue, net of current portion	9,238			10,045
Deferred rent, net of current portion	4,371			4,867
Lease exit liability, net of current portion	—			298
Total liabilities	43,498			42,512
Stockholders' equity:
Common stock, $0.01 par value – 125,000,000 shares authorized, 36,680,522 and 34,870,607 shares outstanding at June 30, 2017 and December 31, 2016, respectively	367			349
Additional paid-in capital	602,085			561,198
Accumulated deficit	(371,024		)	(292,714		)
Accumulated other comprehensive loss	(80		)	(82		)
Total stockholders' equity	231,348			268,751
Total liabilities and stockholders' equity	$	274,846		$	311,263

See accompanying notes.

1

MACROGENICS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)

(unaudited)

(in thousands, except share and per share data)

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017			2016
Revenues:
Revenue from collaborative agreements	$	1,081		$	78,497	$	2,359		$	80,390
Revenue from government agreements	585			2,176		1,361			3,129
Total revenues	1,666			80,673		3,720			83,519
Costs and expenses:
Research and development	34,461			33,340		67,262			60,686
General and administrative	8,384			7,239		15,846			13,372
Total costs and expenses	42,845			40,579		83,108			74,058
Income (loss) from operations	(41,179		)	40,094		(79,388		)	9,461
Other income	525			370		1,078			640
Net income (loss)	(40,654		)	40,464		(78,310		)	10,101
Other comprehensive income (loss):
Unrealized gain (loss) on investments	25			7		(1		)	64
Comprehensive income (loss)	$	(40,629	)	$	40,471	$	(78,311	)	$	10,165
Basic net income (loss) per common share	$	(1.14	)	$	1.17	$	(2.21	)	$	0.29
Diluted net income (loss) per common share	$	(1.14	)	$	1.12	$	(2.21	)	$	0.28
Basic weighted average common shares outstanding	35,784,804			34,616,197		35,373,799			34,560,021
Diluted weighted average common shares outstanding	35,784,804			36,017,411		35,373,799			35,966,987

See accompanying notes.

2

MACROGENICS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

(in thousands)

	Six Months Ended June 30,
	2017			2016
Cash flows from operating activities
Net income (loss)	$	(78,310	)	$	10,101
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization expense	3,981			3,557
Share-based compensation	7,063			6,124
Changes in operating assets and liabilities:
Accounts receivable	773			(77,151		)
Prepaid expenses	(525		)	(1,976		)
Other assets	65			(426		)
Accounts payable	(2,026		)	(355		)
Accrued expenses	6,185			866
Lease exit liability	(771		)	(2,134		)
Deferred revenue	(1,866		)	(3,179		)
Deferred rent	(655		)	(563		)
Net cash used in operating activities	(66,086		)	(65,136		)
Cash flows from investing activities
Purchases of marketable securities	(56,937		)	(202,392		)
Proceeds from sale and maturities of marketable securities	130,505			141,611
Purchases of property and equipment	(8,795		)	(8,339		)
Net cash provided by (used in) investing activities	64,773			(69,120		)
Cash flows from financing activities
Proceeds from issuance of common stock, net of offering costs	33,175			—
Proceeds from stock option exercises and ESPP purchases	667			351
Net cash provided by financing activities	33,842			351
Net change in cash and cash equivalents	32,529			(133,905		)
Cash and cash equivalents at beginning of period	84,098			196,172
Cash and cash equivalents at end of period	$	116,627		$	62,267

See accompanying notes.

3

MACROGENICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (unaudited)

1. Basis of Presentation and Recently Issued Accounting Standards

Basis of Presentation

The accompanying unaudited interim consolidated financial statements of MacroGenics, Inc. (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information. The financial statements include all adjustments (consisting only of normal recurring adjustments) that the management of the Company believes are necessary for a fair presentation of the periods presented. These interim financial results are not necessarily indicative of results expected for the full fiscal year or for any subsequent interim period.

The accompanying unaudited interim consolidated financial statements include the accounts of MacroGenics, Inc. and its wholly owned subsidiary, MacroGenics UK Limited. All intercompany accounts and transactions have been eliminated in consolidation. These consolidated financial statements and related notes should be read in conjunction with the financial statements and notes thereto included in the Company's 2016 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 28, 2017.

There have been no material changes to the significant accounting policies previously disclosed in the Company's 2016 Annual Report on Form 10-K other than the adoption of ASU No. 2015-17, Improvements to Employee Share-Based Payment Accounting, as disclosed in the Recently Issued Accounting Standards section below.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (ASU 2014-09). ASU 2014-09 will eliminate transaction- and industry-specific revenue recognition guidance under current GAAP and replace it with a principle-based approach for determining revenue recognition. ASU 2014-09 will require that companies recognize revenue based on the value of transferred goods or services as they occur in the contract. The ASU also will require additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017 and interim periods therein, with early adoption permitted for interim and annual reporting periods beginning after December 15, 2016. ASU 2014-09 may be adopted either retrospectively or on a modified retrospective basis whereby ASU 2014-09 would be applied to new contracts and existing contracts with remaining performance obligations as of the effective date, with a cumulative catch-up adjustment recorded to beginning retained earnings at the effective date for existing contracts with remaining performance obligations. In 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations, ASU 2016-10,  Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing, and ASU 2016-12, Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients  to provide supplemental adoption guidance and clarification to ASU 2014-09. The effective date for these new standards is the same as the effective date and transition requirements for ASU 2014-09. Management has begun an initial review of each of the Company's collaboration and license agreements and is performing an assessment of the potential effects of the standard on the Company's consolidated financial statements, accounting policies, and internal controls over financial reporting. The Company anticipates that the adoption of the new revenue recognition standard will have primarily two impacts on its contract revenues generated by its collaborative research and license agreements:

(i) Changes in the model for distinct licenses of functional intellectual property which may result in a timing difference of revenue recognition.  Whereas revenue from these arrangements was previously recognized over a period of time pursuant to revenue recognition guidance that was in place for the arrangements at the time such arrangements commenced, revenue from these arrangements may now be recognized at point in time under the new guidance.

(ii) Assessments of milestone payments, which are linked to events that are in the Company’s control, will result in variable consideration that may be recognized at an earlier point in time under the new guidance, when it is probable that the milestone will be achieved without a significant future reversal of cumulative revenue expected.

The Company plans to adopt the new standard effective January 1, 2018 using the modified retrospective method with the cumulative effective of initially applying the new standard recognized in retained earnings at the date of initial adoption. The Company has begun to analyze its existing revenue agreements to evaluate the impact of adoption.

In February 2016, FASB issued ASU No. 2016-02, Leases (ASU 2016-02) that provides principles for the recognition, measurement, presentation and disclosure of leases for both lessees and lessors.  ASU 2016-02 requires a lessee to recognize

4

assets and liabilities on the balance sheet for operating leases and changes many key definitions, including the definition of a lease. ASU 2016-02 includes a short-term lease exception for leases with a term of 12 months or less, in which a lessee can make an accounting policy election not to recognize lease assets and lease liabilities. Lessees will continue to differentiate between finance leases (previously referred to as capital leases) and operating leases, using classification criteria that are substantially similar to the previous guidance. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with earlier application permitted. The Company is currently evaluating the effect of the standard on its consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, Improvementsto Employee Share-Based Payment Accounting (ASU 2016-09). This amendment addresses several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, including interim periods within that year. The Company adopted ASU 2016-09 effective January 1, 2017 and has elected to continue to estimate the number of stock-based awards expected to vest, as permitted by ASU 2016-09, rather than electing to account for forfeitures as they occur. The adoption of this standard did not have a material impact on the Company's financial statements or related disclosures.

2. Fair Value of Financial Instruments

The Company's financial instruments consist of cash and cash equivalents, marketable securities, accounts receivable, accounts payable and accrued expenses.The carrying amount of accounts receivable, accounts payable and accrued expenses are generally considered to be representative of their respective fair values because of their short-term nature.  The Company accounts for recurring and non-recurring fair value measurements in accordance with FASB Accounting Standards Codification (ASC) 820, Fair Value Measurements and Disclosures (ASC 820). ASC 820 defines fair value, establishes a fair value hierarchy for assets and liabilities measured at fair value, and requires expanded disclosures about fair value measurements. The ASC 820 hierarchy ranks the quality of reliability of inputs, or assumptions, used in the determination of fair value and requires assets and liabilities carried at fair value to be classified and disclosed in one of the following three categories:

• Level 1 - Fair value is determined by using unadjusted quoted prices that are available in active markets for identical assets and liabilities.

• Level 2 - Fair value is determined by using inputs other than Level 1 quoted prices that are directly or indirectly observable. Inputs can include quoted prices for similar assets and liabilities in active markets or quoted prices for identical assets and liabilities in inactive markets. Related inputs can also include those used in valuation or other pricing models, such as interest rates and yield curves that can be corroborated by observable market data.

• Level 3 - Fair value is determined by inputs that are unobservable and not corroborated by market data. Use of these inputs involves significant and subjective judgments to be made by a reporting entity - e.g., determining an appropriate adjustment to a discount factor for illiquidity associated with a given security.

The Company evaluates financial assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level at which to classify them each reporting period. This determination requires the Company to make subjective judgments as to the significance of inputs used in determining fair value and where such inputs lie within the ASC 820 hierarchy.

5

Financial assets measured at fair value on a recurring basis were as follows (in thousands):

	Fair Value Measurements at June 30, 2017
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	92,815	$	92,815	$	—	$	—
U.S. Treasury securities	13,782		—		13,782		—
Government-sponsored enterprises	26,129		—		26,129		—
Corporate debt securities	87,122		—		87,122		—
Total assets measured at fair value(a)	$	219,848	$	92,815	$	127,033	$	—

(a) Total assets measured at fair value at June 30, 2017 includes approximately $92.8 million reported in cash and cash equivalents on the balance sheet.

	Fair Value Measurements at December 31, 2016
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	46,781	$	46,781	$	—	$	—
U.S. Treasury securities	8,826		—		8,826		—
Government-sponsored enterprises	29,759		—		29,759		—
Corporate debt securities	166,300		—		166,300		—
Total assets measured at fair value(a)	$	251,666	$	46,781	$	204,885	$	—

(a) Total assets measured at fair value at December 31, 2016 includes approximately $50.8 million reported in cash and cash equivalents on the balance sheet.

The fair value of Level 2 securities is determined from market pricing and other observable market inputs for similar securities obtained from various third-party data providers. These inputs either represent quoted prices for similar assets in active markets or have been derived from observable market data. There were no transfers between Level 1 and Level 2 investments during the periods presented.

3. Marketable Securities

Available-for-sale marketable securities as of June 30, 2017 and December 31, 2016 were as follows (in thousands):

	June 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	13,802	$	—	$	(20	)	$	13,782
Government-sponsored enterprises	26,159		—		(30		)	26,129
Corporate debt securities	87,152		5		(35		)	87,122
Total	$	127,113	$	5	$	(85	)	$	127,033

6

	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	4,826	$	—	$	(1	)	$	4,825
Government-sponsored enterprises	29,764		5		(10		)	29,759
Corporate debt securities	166,376		51		(127		)	166,300
Total	$	200,966	$	56	$	(138	)	$	200,884

All available-for-sale marketable securities held as of June 30, 2017 had contractual maturities of less than one year. All of the Company's available-for-sale marketable securities in an unrealized loss position as of June 30, 2017 and December 31, 2016 were in a loss position for less than twelve months.  There were no unrealized losses at June 30, 2017 or December 31, 2016 that the Company determined to be other-than-temporary.

4. Lease Exit Liability

In 2008, the Company acquired Raven Biotechnologies, Inc. (Raven), a private South San Francisco-based company focused on the development of monoclonal antibody therapeutics for treating cancer. The Company undertook restructuring activities related to the acquisition of Raven. In connection with these restructuring activities, as part of the cost of acquisition, the Company established a restructuring liability attributed to an existing operating lease.  During the year ended December 31, 2016, the Company entered into an agreement to sublease a portion of the space subject to this operating lease.  The Company will receive approximately $1.3 million in sublease payments over its term, which ends at the same time as the original lease in February 2018.  No sublease income was contemplated when the restructuring liability was recorded in 2008; therefore, the Company adjusted the liability to reflect the future sublease income during the year ended December 31, 2016 and recorded an offset to research and development expenses of approximately $1.3 million in the same period.

Changes in the lease exit liability are as follows (in thousands):

Accrual balance at December 31, 2016	$	1,891
Principal payments	(771		)
Accrual balance at June 30, 2017	$	1,120

5. Stockholders' Equity

On April 26, 2017, the Company entered into a definitive agreement with an institutional healthcare investor to purchase 1,100,000 shares of its common stock at a purchase price of $21.50 per share in a registered direct offering. Gross proceeds to the Company, before deducting estimated offering expenses, were $23.7 million. The shares were offered pursuant to the Company’s shelf registration on Form S-3 that was filed with the SEC on November 2, 2016.

On May 3, 2017, the Company entered into a sales agreement with an agent to sell, from time to time, shares of its common stock having an aggregate sales price of up to $75.0 million through an “at the market offering” (ATM Offering) as defined in Rule 415 under the Securities Act of 1933, as amended. The shares that may be sold under the sales agreement would be issued and sold pursuant to the Company's shelf registration statement on Form S-3 that was filed with the SEC on November 2, 2016. Through June 30, 2017, the Company sold 536,942 shares of common stock under the sales agreement, resulting in net proceeds of $9.7 million related to the ATM Offering.

7

6. Collaboration and Other Agreements

Janssen Biotech, Inc.

In December 2014, the Company entered into a collaboration and license agreement with Janssen Biotech, Inc. (Janssen) for the development and commercialization of MGD011 (also known as duvortuxizumab), a product candidate that incorporates the Company's proprietary DART® technology to simultaneously target CD19 and CD3 for the potential treatment of B-cell hematological malignancies (MGD011 Agreement). The Company contemporaneously entered into an agreement with Johnson & Johnson Innovation - JJDC, Inc. (JJDC) under which JJDC agreed to purchase 1,923,077 new shares of the Company's common stock for proceeds of $75.0 million.  Upon closing the transaction in January 2015, the Company received a $50.0 million upfront payment from Janssen as well as the $75.0 million investment in the Company's common stock.  

Under the MGD011 Agreement, the Company granted an exclusive license to Janssen to develop and commercialize duvortuxizumab. Following the Company's submission of the Investigational New Drug (IND) application, Janssen became fully responsible for the development and commercialization of duvortuxizumab.  Assuming successful development and commercialization, the agreement entitles the Company to receive up to $205.0 million in development milestone payments, $220.0 million in regulatory milestone payments and $150.0 million in sales milestone payments. The Company determined that each potential future clinical and regulatory milestone is substantive.  Although the sales milestones are not considered substantive, they will be recognized upon achievement of the milestone (assuming all other revenue recognition criteria have been met) because there are no undelivered elements that would preclude revenue recognition at that time.  The Company may elect to fund a portion of late-stage clinical development in exchange for a profit share with Janssen in the U.S. and Canada. If commercialized, the Company would be eligible to receive low double-digit royalties on any global net sales and has the option to co-promote the molecule with Janssen in the United States.

The Company evaluated the MGD011 Agreement and determined that it is a revenue arrangement with multiple deliverables, or performance obligations.  The Company's substantive performance obligations under the collaboration and license agreement include the delivery of an exclusive license and research and development services during the preclinical research period (through the filing of the IND application for duvortuxizumab).   The Company evaluated the MGD011 Agreement and determined that the license and preclinical research and development activities each represented separate deliverables and were accounted for as separate units of accounting.  The Company concluded that the license had standalone value to Janssen and was separable from the research and development services because the license was sublicensable, there were no restrictions as to Janssen's use of the license and Janssen or other third parties have significant research capabilities in this field.  Thus, the total arrangement consideration for these two deliverables was allocated using the relative best estimate of selling price method to each deliverable.  The best estimate of selling price for the exclusive license was determined using a discounted cash flow model that includes Level 3 fair value measurements. The best estimate of selling price for the research and development services was determined using other similar research and development arrangements, which are Level 2 fair value measurements.

The Company evaluated the stock purchase agreement and the collaboration and license agreement as one arrangement and determined that the stock purchase price of $39.00 per share exceeded the fair value of the common stock by $12.3 million. This excess was recognized in the same manner as the upfront payment allocated to the license and preclinical research and development activities.  Of the total arrangement consideration of $125.0 million, the Company allocated $62.7 million to equity (representing the fair value of common stock purchased), $62.3 million to the license and preclinical research and development activities, and a de minimis amount to the ongoing research and development activities.  The Company submitted the IND application and therefore met its performance obligation during the year ended December 31, 2015.

There was no revenue recognized under the MGD011 Agreement during any of the three or six-month periods ended June 30, 2017 or 2016.

In May 2016, the Company entered into a separate collaboration and license agreement with Janssen, a related party through ownership of the Company's common stock, for the development and commercialization of MGD015 (also known as JNJ-9383), a product candidate that incorporates the Company's proprietary DART technology to simultaneously target CD3 and an undisclosed tumor target for the potential treatment of various hematological malignancies and solid tumors (MGD015 Agreement). The transaction closed in June 2016, and the Company received the $75.0 million upfront payment from Janssen in July 2016.  

Under the MGD015 Agreement, the Company granted an exclusive license to Janssen to develop and commercialize MGD015. Janssen will complete the IND-enabling activities and will be fully responsible for the future clinical development and commercialization of MGD015.   Assuming successful development and commercialization, the agreement entitles the Company to receive up to $100.0 million in development milestone payments, $265.0 million in regulatory milestone payments and $300.0 million in sales milestone payments. The Company determined that each potential future clinical and regulatory

8

milestone is substantive.  Although the sales milestones are not considered substantive, they will be recognized upon achievement of the milestone (assuming all other revenue recognition criteria have been met) because there are no undelivered elements that would preclude revenue recognition at that time.  The Company may elect to fund a portion of late-stage clinical development in exchange for a profit share with Janssen in the U.S. and Canada. If commercialized, the Company would be eligible to receive low double-digit royalties on any global net sales and has the option to co-promote the molecule with Janssen in the United States.

The Company evaluated the MGD015 Agreement and determined that it is a revenue arrangement with multiple deliverables, or performance obligations.  The Company's substantive performance obligations under the MGD015 Agreement include the delivery of an exclusive license and research and development services during the preclinical research period.   The Company evaluated the MGD015 Agreement and determined that the license and preclinical research and development activities each represented separate deliverables and were accounted for as two separate units of accounting.  The Company concluded that the license had standalone value to Janssen and was separable from the research and development services because the license was sublicensable, there were no restrictions as to Janssen's use of the license and Janssen or other third parties have significant research capabilities in this field.  Thus, the total arrangement consideration for these two deliverables was allocated using the best estimate of relative selling price method to each deliverable.  The best estimate of selling price for the exclusive license was determined using information from the previous collaboration and license agreement with Janssen as well as other third party collaboration and license agreements, which are Level 2 fair value measurements. The best estimate of selling price for the research and development services was determined using other similar research and development arrangements, which are also Level 2 fair value measurements.

The company recognized $0.2 million and $0.3 million of revenue under the MGD015 Agreement during the three and six months ended June 30, 2017, respectively. No revenue was recognized under the MGD015 Agreement during the three and six months ended June 30, 2016.

Les Laboratoires Servier

In September 2012, the Company entered into a right-to-develop collaboration agreement with Les Laboratoires Servier and Institut de Recherches Servier (collectively, Servier) and granted it options to obtain three separate exclusive licenses to develop and commercialize DART molecules, consisting of those designated by the Company as flotetuzumab (also known as MGD006 or S80880) and MGD007, as well as a third DART molecule, in all countries other than the United States, Canada, Mexico, Japan, South Korea and India. During 2014, Servier exercised its exclusive option to develop and commercialize flotetuzumab, and during 2016 Servier notified the Company that it did not intend to exercise the option for the third DART molecule. Servier retains the option to obtain a license for MGD007.

Upon execution of the agreement, Servier made a nonrefundable payment of $20.0 million to the Company. In addition, the Company will be eligible to receive up to $40.0 million in license fees, $63.0 million in clinical milestone payments, $188.0 million in regulatory milestone payments and $420.0 million in sales milestone payments if Servier exercises the remaining available options and successfully develops, obtains regulatory approval for, and commercializes a product under each license. In addition to these milestones, the Company and Servier will share Phase 2 and Phase 3 development costs. The Company has determined that each potential future clinical and regulatory milestone is substantive. Although sales milestones are not considered substantive, they are still recognized upon achievement of the milestone (assuming all other revenue recognition criteria have been met) because there are no undelivered elements that would preclude revenue recognition at that time. Under this agreement, Servier would be obligated to pay the Company from low double-digit to mid-teen royalties on net product sales in its territories.

The Company evaluated the research collaboration agreement with Servier and determined that it is a revenue arrangement with multiple deliverables, or performance obligations. The Company concluded that each option is substantive and that the license fees for each option are not deliverables at the inception of the arrangement and were not issued with a substantial discount. The Company's substantive performance obligations under this research collaboration include an exclusivity clause to its technology, technical, scientific and intellectual property support to the research plan and participation on an executive committee and a research and development committee. The Company determined that the performance obligations with respect to the preclinical development represent a single unit of accounting, since the license does not have stand-alone value to Servier without the Company's technical expertise and committee participation. As such, the initial upfront license payment was deferred and initially recognized ratably over a 29-month period, which represented the expected development period. During 2014, the Company and Servier further refined the research plan related to the three DART molecules and as such, the development period was extended.  Based on this revised development period, the Company prospectively adjusted its period of recognition of the upfront payment to a 75-month period. The impact of this change in accounting estimate reduced revenue that would have been recognized in 2014 by $3.7 million.

9

As a result of Servier exercising its option in 2014, the Company received a $15.0 million payment from Servier for its license to develop and commercialize flotetuzumab in its territories.  Upon exercise of the option, the Company evaluated its performance obligations with respect to the license for flotetuzumab. The Company's substantive performance obligations under this research collaboration include an exclusive license to its technology, technical, scientific and intellectual property support to the research plan and participation on an executive committee and a research and development committee. The Company determined that the performance obligations with respect to the clinical development represent a single unit of accounting, since the license does not have stand-alone value to Servier without the Company's technical expertise and committee participation. As such, the $15.0 million license fee was deferred and was being recognized ratably over a period of 82 months, which represented the expected development period for flotetuzumab. During the three months ended June 30, 2017, the Company and Servier determined that the expected development period should be extended to 124 months.  The impact of this change in accounting estimate reduced revenue that would have been recognized in 2017 by $0.8 million. In accordance with the agreement, the Company and Servier will share costs incurred to develop flotetuzumab.  Reimbursement of research and development expenses received in connection with this collaborative cost-sharing agreement is recorded as a reduction to research and development expense. During the three months ended June 30, 2017 and 2016, the Company recorded approximately $0.4 million and $0.7 million as an offset to research and development costs under this collaboration agreement, respectively. During the six months ended June 30, 2017 and 2016, the Company recorded approximately $0.9 million and $1.1 million as an offset to research and development costs under this collaboration agreement, respectively. 

The Company recognized revenue under this agreement of $0.6 million and $0.8 million during the three months ended June 30, 2017 and 2016, respectively. The Company recognized revenue under this agreement of $1.4 million and $1.7 million during the six months ended June 30, 2017 and 2016, respectively. At June 30, 2017, $9.7 million of revenue was deferred under this agreement, $2.3 million of which was current and $7.4 million of which was non-current. At December 31, 2016, $11.1 million of revenue was deferred under this agreement, $3.3 million of which was current and $7.8 million of which was non-current. 

NIAID Contract

The Company entered into a contract with the National Institute of Allergy and Infectious Diseases (NIAID), effective as of September 15, 2015, to perform product development and to advance up to two DART molecules, including MGD014. Under this contract, the Company will develop these product candidates for Phase 1/2 clinical trials as therapeutic agents, in combination with latency reversing treatments, to deplete cells infected with human immunodeficiency virus (HIV) infection. This contract includes a base period of $7.5 million to support development of MGD014 through IND application submission with the FDA, as well as up to $17.0 million in additional development funding via NIAID options. Should NIAID fully exercise such options, the Company could receive total payments of up to $24.5 million. The total potential period of performance under the award is from September 15, 2015 through September 14, 2022. The Company recognized $0.4 million and $2.1 million in revenue under this contract during the three months ended June 30, 2017 and 2016, respectively. The Company recognized $1.0 million and $3.1 million in revenue under this contract during the six months ended June 30, 2017 and 2016, respectively.

7. Stock-Based Compensation

Employee Stock Purchase Plan

In May 2017, the Company’s stockholders approved the 2016 Employee Stock Purchase Plan (the 2016 ESPP). The 2016 ESPP is structured as a qualified employee stock purchase plan under Section 423 of the Internal Revenue Code of 1986, as amended, and is not subject to the provisions of the Employee Retirement Income Security Act of 1974. The Company reserved 800,000 shares of common stock for issuance under the 2016 ESPP. The 2016 ESPP allows eligible employees to purchase shares of the Company’s common stock at a discount through payroll deductions of up to 10% of their eligible compensation, subject to any plan limitations. The 2016 ESPP provides for six-month offering periods ending on May 31 and November 30 of each year. At the end of each offering period, employees are able to purchase shares at 85% of the fair market value of the Company’s common stock on the last day of the offering period. During the three and six months ended June 30, 2017, employees purchased 19,351 shares of common stock under the ESPP plan for net proceeds to the Company of approximately $0.3 million.

Employee Stock Option Plans

Effective February 2003, the Company implemented the 2003 Equity Incentive Plan (2003 Plan), and it was amended and approved by the Company's stockholders in 2005. The 2003 Plan originally allowed for the grant of awards in respect of an aggregate of 2,051,644 shares of the Company's common stock. Between 2006 and 2012, the maximum number of shares of

10

common stock authorized to be issued by the Company under the 2003 Plan was increased to 4,336,730. Stock options granted under the 2003 Plan may be either incentive stock options as defined by the Internal Revenue Code (IRC), or non-qualified stock options.

In 2013, the 2003 Plan was terminated, and no further awards may be issued under the plan. Any shares of common stock subject to awards under the 2003 Plan that expire, terminate, or are otherwise surrendered, canceled, forfeited or repurchased without having been fully exercised, or resulting in any common stock being issued, will become available for issuance under the Company's 2013 Stock Incentive Plan (2013 Plan), up to a specified number of shares.  As of June 30, 2017, under the 2003 Plan, there were options to purchase an aggregate of 1,053,487 shares of common stock outstanding at a weighted average exercise price of $1.85 per share.

Under the provisions of the 2013 Plan, the number of shares of common stock reserved for issuance will automatically increase on January 1 of each year from January 1, 2014 through and including January 1, 2023, by the lesser of (a) 1,960,168 shares, (b) 4.0% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year, or (c) the number of shares of common stock determined by the Board of Directors. During the six months ended June 30, 2017, the maximum number of shares of common stock authorized to be issued by the Company under the 2013 Plan was increased to 6,769,888.   As of June 30, 2017, there were options to purchase an aggregate of 3,567,521 shares of common stock outstanding at a weighted average exercise price of $24.88 per share under the 2013 Plan.

The following table shows stock-based compensation expense for stock options, RSUs and ESPP (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Research and development	$	1,833	$	1,445	$	3,506	$	2,841
General and administrative	1,769		1,678		3,557		3,283
Total stock-based compensation expense	$	3,602	$	3,123	$	7,063	$	6,124

The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model using the assumptions in the following table for options issued during the period indicated:

	Six Months Ended June 30,
	2017	2016
Expected dividend yield	0%	0%
Expected volatility	66.7% - 67.7%	63.7% - 65.4%
Risk-free interest rate	2.0% - 2.3%	1.3% - 2.1%
Expected term	6.25 years	6.25 years

11

The following table summarizes stock option and restricted stock unit (RSU) activity during the six months ended June 30, 2017:

	Shares		Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2016	3,838,060		$	18.93	7.0
Granted	1,120,950		20.38
Exercised	(155,484	)	2.36
Forfeited or expired	(182,518	)	24.13
Outstanding, June 30, 2017	4,621,008		19.63		7.2	$	17,581
As of June 30, 2017:
Exercisable	2,534,628		15.86		5.8	16,784
Vested and expected to vest	4,407,535		19.37		7.1	17,489

The weighted-average grant-date fair value of options granted for the six months ended June 30, 2017 was $12.73. The total intrinsic value of options exercised during the six months ended June 30, 2017 was approximately $2.6 million, and the total cash received for options exercised was approximately $0.3 million. The total fair value of shares vested in the six months ended June 30, 2017 was approximately $6.1 million. As of June 30, 2017, the total unrecognized compensation expense related to non-vested stock options, net of related forfeiture estimates, was approximately $26.5 million, which the Company expects to recognize over a weighted-average period of approximately 2.6 years.

8. Commitments and Contingencies

Operating Leases

The Company leases manufacturing, office and laboratory space in Rockville, Maryland under five leases that have terms that expire between 2018 and 2023 unless renewed.   During the three months ended June 30, 2017, one of these leases was renewed for an additional five years. The Rockville leases include a seven-year lease executed in July 2015 for additional space that the Company intends to use as mixed-use office, laboratory and manufacturing space.   Under the terms of the lease, which commenced on January 1, 2016, the Company received an assignment fee from the former tenant and a tenant improvement allowance from the landlord totaling $5.1 million, which has been recorded as deferred rent and will be recognized over the lease term.   The Company also leases office and laboratory space in South San Francisco under a lease that expires on February 28, 2018. During the year ended December 31, 2016, the Company entered into a sublease agreement for a portion of the South San Francisco space (see Note 4). As of June 30, 2017, future payments to be received by the Company under this sublease total approximately $0.5 million. In April 2017, the Company entered into a 72-month lease commencing December 1, 2017 for office and laboratory space which will be occupied upon the termination of the current South San Francisco lease.

All of the leases contain rent escalation clauses and certain leases contain rent abatements.  For financial reporting purposes, rent expense is charged to operations on a straight-line basis over the term of the lease.  

Future minimum lease payments under noncancelable operating leases as of June 30, 2017 are as follows (in thousands):

Year Ended December 31,
2017	$	6,391
2018	5,346
2019	5,077
2020	3,454
2021	3,926
Thereafter	5,129
	$	29,323

12

Contingencies

From time to time, the Company may be subject to various litigation and related matters arising in the ordinary course of business. The Company does not believe it is currently subject to any material matters where there is at least a reasonable possibility that a material loss may be incurred.

9. Net Income (Loss) Per Share

Basic income (loss) per common share is determined by dividing income (loss) attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. Diluted income (loss) per share is computed by dividing the income (loss) attributable to common stockholders by the weighted-average number of common stock equivalents outstanding for the period. The treasury stock method is used to determine the dilutive effect of the Company's stock option grants. 4,621,008 stock options (common stock equivalents) were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2017, respectively, because their inclusion would have been anti-dilutive. 257,678 and 114,148 stock options were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2016, respectively, because their inclusion would have been anti-dilutive.

Basic and diluted income (loss) per common share is computed as follows (in thousands except share and per share data):

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017			2016
Numerator:
Net income (loss) used for calculation of basic and diluted EPS	$	(40,654	)	$	40,464	$	(78,310	)	$	10,101
Denominator:
Weighted average shares outstanding, basic	35,784,804			34,616,197		35,373,799			34,560,021
Effect of dilutive securities:
Stock options and restricted stock units	—			1,401,214		—			1,406,966
Weighted average shares outstanding, diluted	35,784,804			36,017,411		35,373,799			35,966,987
Net income (loss) per share, basic	$	(1.14	)	$	1.17	$	(2.21	)	$	0.29
Net income (loss) per share, diluted	$	(1.14	)	$	1.12	$	(2.21	)	$	0.28

10. Subsequent Events

On July 6, 2017, the Company entered into an agreement to sublease a portion of the space it leases in Rockville, MD. Under the terms of the sublease, which commences August 1, 2017, the Company will receive a total of $2.4 million over the 30 month term.

On July 21, 2017, the Company executed a lease amendment for its headquarters building in Rockville, MD. This amendment extends the term of the lease to August 2027, restructures the rent due under the lease, and provides for an additional tenant improvement allowance from the landlord of $7.5 million. Future rent payments under the amended lease will increase by $23.5 million, which is not reflected in the future minimum lease payments table in Note 8.

13

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

The following discussion of our financial condition and results of operations is based upon our unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q, which have been prepared by us in accordance with GAAP, for interim periods and with Regulation S-X promulgated under the Securities Exchange Act of 1934, as amended. This discussion and analysis should be read in conjunction with these unaudited consolidated financial statements and the notes thereto as well as in conjunction with our audited consolidated financial statements and related notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2016.

Overview

We are a biopharmaceutical company focused on discovering and developing innovative antibody-based therapeutics for the treatment of cancer as well as various autoimmune disorders and infectious diseases. We currently have a pipeline of product candidates in human clinical testing, primarily against different types of cancers, which have been created using our proprietary technology platforms. We believe our programs have the potential to have a meaningful effect on treating patients' unmet medical needs as monotherapy or, in some cases, in combination with other therapeutic agents.

We commenced active operations in 2000, and have since devoted substantially all of our resources to staffing our company, developing our technology platforms, identifying potential product candidates, undertaking preclinical studies, conducting clinical trials, developing collaborations, business planning and raising capital. We have not generated any revenues from the sale of any products to date. We have financed our operations primarily through the public and private offerings of our securities, collaborations with other biopharmaceutical companies, and government grants and contracts.  Although it is difficult to predict our funding requirements, based upon our current operating plan, we anticipate that our cash, cash equivalents and marketable securities as of June 30, 2017, combined with collaboration payments we anticipate receiving, will enable us to fund our operations into 2019.

We have incurred significant losses since our inception and we have an accumulated deficit of approximately $371.0 million as of June 30, 2017. Our net losses were $78.3 million for the six months ended June 30, 2017 and $58.5 million for the fiscal year ended December 31, 2016. These losses have resulted principally from costs incurred in connection with research and development activities and general and administrative costs associated with our operations. We expect to continue to incur losses for the foreseeable future, and we expect these losses to increase as we continue our research and development of, and seek regulatory approvals for, our product candidates, prepare for and begin to commercialize any approved products, and add infrastructure and personnel to support our product development efforts and operations. The net losses and negative cash flows incurred to date, together with expected future losses, have had, and likely will continue to have, an adverse effect on our stockholders' deficit and working capital. The amount of future net losses will depend, in part, on the rate of future growth of our expenses and our ability to generate revenue.

Strategic Collaborations

We pursue a balanced approach between product candidates that we develop ourselves and those that we develop with our collaborators. Under our current strategic collaborations to date, we have received significant non-dilutive funding and continue to have rights to additional funding upon completion of certain research, achievement of key product development milestones, or royalties and other payments upon the commercial sale of products. Currently, our most significant strategic collaborations include the following:

• Janssen. In December 2014, we entered into a collaboration and license agreement with Janssen for the development and commercialization of duvortuxizumab, a product candidate that incorporates our proprietary DART technology to simultaneously target CD19 and CD3 for the potential treatment of B-cell hematological malignancies.  We contemporaneously entered into an agreement with JJDC, an affiliate of Janssen, under which JJDC agreed to purchase 1,923,077 new shares of our common stock for proceeds of $75.0 million.  Upon closing, we received a $50.0 million upfront payment from Janssen as well as the $75.0 million investment in our common stock.  Janssen is leading the development of this product candidate, subject to our options to co-promote the product in the United States and Canada and to invest in later-stage development in exchange for a United States and Canada profit-share.  Janssen initiated a human clinical trial in 2015 for a variety of B-cell hematological malignancies, including diffuse-large B cell lymphoma, follicular lymphoma, mantle-cell lymphoma, chronic lymphocytic leukemia and acute lymphoblastic leukemia.  The initiation of this trial triggered a $10.0 million milestone payment to us.  Assuming successful development and commercialization, we could receive up to an additional $565.0 million in clinical, regulatory and commercialization milestone payments. If commercialized, we would be eligible to receive low double-digit royalties on any global net sales.

14

In May 2016, we entered into a separate collaboration and license agreement with Janssen for the development and commercialization of MGD015, a product candidate that incorporates our proprietary DART technology to simultaneously target CD3 and an undisclosed tumor target for the potential treatment of various hematological malignancies and solid tumors. The transaction closed in June 2016, and we received the $75.0 million upfront payment from Janssen in July 2016.  Under the collaboration and license agreement, we granted an exclusive license to Janssen to develop and commercialize MGD015. Janssen will complete the IND-enabling activities and will be fully responsible for the future clinical development and commercialization of MGD015.   Assuming successful development and commercialization, the agreement entitles us to receive up to $665.0 million in development, regulatory and sales milestone payments. If commercialized, we would be eligible to receive low double-digit royalties on any global net sales and have the option to co-promote the molecule with Janssen in the United States.

• Servier. In September 2012, we entered into an agreement with Servier to develop and commercialize three DART molecules in all countries other than the United States, Canada, Mexico, Japan, South Korea and India. We received a $20.0 million upfront option fee. In addition, we became eligible to receive up to approximately $1.0 billion in additional license fees and clinical, development, regulatory and sales milestone payments for each product Servier successfully develops, obtains regulatory approval for, and commercializes. Additionally, assuming exercise of its options, Servier may share Phase 2 and Phase 3 development costs and would be obligated to pay us low double-digit to mid-teen royalties on product sales in its territories.

In February 2014, Servier exercised its option to develop and commercialize flotetuzumab, for which we received a $15.0 million license option fee.  We also received two $5.0 million milestone payments from Servier in 2014 in connection with the IND applications for flotetuzumab and MGD007 clearing the 30-day review period by the U.S. Food and Drug Administration (FDA). As of June 30, 2017, Servier still retains an option to obtain a license for MGD007, but has notified us that they have terminated their rights to license the third DART molecule.

Critical Accounting Policies and Significant Judgments and Estimates

Our critical accounting policies are those policies which require the most significant judgments and estimates in the preparation of our consolidated financial statements. A summary of our critical accounting policies is presented in Part II, Item 7, of our Annual Report on Form 10-K for the year ended December 31, 2016. There have been no material changes to our critical accounting policies during the three months ended June 30, 2017.

Results of Operations

Revenue

The following represents a comparison of our revenue for the three months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Increase/(Decrease)
	2017		2016
			(dollars in millions)
Revenue from collaborative agreements	$	1.1	$	78.5	$	(77.4	)	(99	)%
Revenue from government agreements	0.6		2.2		(1.6		)	(73	)%
Total revenue	$	1.7	$	80.7	$	(79.0	)	(98	)%

	Six Months Ended June 30,				Increase/(Decrease)
	2017		2016
	(dollars in millions)
Revenue from collaborative agreements	$	2.4	$	80.4	$	(78.0	)	(97	)%
Revenue from government agreements	1.4		3.1		(1.7		)	(55	)%
Total revenue	$	3.8	$	83.5	$	(79.7	)	(95	)%

15

Collaboration revenue decreased by $77.4 million for the three months ended June 30, 2017 compared to the three months ended June 30, 2016 and $78.0 million for the six months ended June 30, 2017 compared to the six months ended June 30, 2016 primarily due to the $75.0 million upfront payment under the Janssen MGD015 agreement and a $2.0 million milestone payment from Pfizer, Inc., both of which were recognized in the second quarter of 2016.

Revenue from government agreements decreased by $1.6 million and $1.7 million for the three and six months ended June 30, 2017 compared to the three and six months ended June 30, 2016, respectively, primarily due to less costs incurred under the NIAID cost plus fixed fee contract.

Research and Development Expense

The following represents a comparison of our research and development expense for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Increase/(Decrease)
	2017		2016
	(dollars in millions)
Margetuximab	$	10.4	$	12.4	$	(2.0	)	(16	)%
Enoblituzumab	5.1		4.4		0.7			16	%
Flotetuzumab	0.9		0.1		0.8			800	%
MGD007	1.7		0.6		1.1			183	%
MGD009	0.8		0.6		0.2			33	%
MGD010	0.5		1.4		(0.9		)	(64	)%
Duvortuxizumab	—		0.7		(0.7		)	(100	)%
MGA012*	3.1		—		3.1			N/A
Preclinical immune checkpoint programs	5.1		5.3		(0.2		)	(4	)%
Other preclinical and clinical programs, collectively	6.9		7.8		(0.9		)	(12	)%
Total research and development expense	$	34.5	$	33.3	$	1.2		4	%

	Six Months Ended June 30,				Increase/(Decrease)
	2017		2016
	(dollars in millions)
Margetuximab	$	21.1	$	19.8	$	1.3		7	%
Enoblituzumab	9.0		8.6		0.4			5	%
Flotetuzumab	1.9		1.9		—			—	%
MGD007	2.9		1.6		1.3			81	%
MGD009	1.9		1.5		0.4			27	%
MGD010	2.1		3.2		(1.1		)	(34	)%
Duvortuxizumab	0.1		2.1		(2.0		)	(95	)%
MGA012*	5.5		—		5.5			N/A
Preclinical immune checkpoint programs	10.0		10.8		(0.8		)	(7	)%
Other preclinical and clinical programs, collectively	12.8		11.2		1.6			14	%
Total research and development expense	$	67.3	$	60.7	$	6.6		11	%

*MGA012 was included in Preclinical immune checkpoint programs for the three and six months ended June 30, 2016.

During the three months ended June 30, 2017 our research and development expense increased by $1.2 million compared to the three months ended June 30, 2016. This increase was primarily due to the initiation of a Phase 1 clinical trial of MGA012 in late 2016 and continued enrollment in our various clinical trials.  These increases were partially offset by a

16

decrease in duvortuxizumab manufacturing costs, which are reimbursed by our collaborator. Our research and development expense increased by $6.6 million for the six months ended June 30, 2017 compared to the six months ended June 30, 2016 primarily due to the initiation of a Phase 1 clinical trial of MGA012 in late 2016, continued enrollment in our various clinical trials and increased activity in our other preclinical and clinical programs.  These increases were partially offset by a decrease in duvortuxizumab manufacturing costs, which are reimbursed by our collaborator.

General and Administrative Expense

The following represents a comparison of our general and administrative expense for the three months ended June 30, 2017 and 2016:

	Three Months Ended June 30,				Increase
	2017		2016
			(dollars in millions)
General and administrative expense	$	8.4	$	7.2	$	1.2	17	%

	Six Months Ended June 30,				Increase
	2017		2016
			(dollars in millions)
General and administrative expense	$	15.8	$	13.4	$	2.4	18	%

General and administrative expense increased for the three and six months ended June 30, 2017 compared to the three and six months ended June 30, 2016 primarily due to increased professional fees, including consulting expenses, and increased employee compensation and benefit expense to support our overall growth.

Other Income

The increase in other income for the three and six months ended June 30, 2017 compared to the three and six months ended June 30, 2016 is due to an increase in interest income earned on investments. 

Liquidity and Capital Resources

We have historically financed our operations primarily through public and private offerings of equity, upfront fees, milestone payments and license option fees from collaborators and reimbursement through government grants and contracts.    As of June 30, 2017, we had $243.7 million in cash, cash equivalents and marketable securities. In addition to our existing cash, cash equivalents and marketable securities, we are eligible to receive additional reimbursement from our collaborators, including under various government grants or contracts, for certain research and development services rendered, additional milestone payments and opt-in payments. However, our ability to receive these milestone payments is dependent upon our ability to successfully complete specified research and development activities and is therefore uncertain at this time.

Funding Requirements

We have not generated any revenue from product sales to date and do not expect to do so until such time as we obtain regulatory approval of and commercialize one or more of our product candidates. As we are currently in the clinical trial stage of development, it will be some time before we expect to achieve this and it is uncertain that we ever will. We expect that we will continue to increase our operating expenses in connection with ongoing as well as additional clinical trials and preclinical development of product candidates in our pipeline. We expect to continue our collaboration arrangements and will look for additional collaboration opportunities. We also expect to continue our efforts to pursue additional grants and contracts from the U.S. government in order to further our research and development. Although it is difficult to predict our funding requirements, based upon our current operating plan, we anticipate that our existing cash, cash equivalents and marketable securities as of June 30, 2017, as well as other collaboration payments we anticipate receiving, will enable us to fund our operations into 2019.

17

Cash Flows

The following table represents a summary of our cash flows for the six months ended June 30, 2017 and 2016:

	Six Months Ended June 30,
	2017			2016
	(dollars in millions)
Net cash provided by (used in):
Operating activities	$	(66.1	)	$	(65.1	)
Investing activities	64.8			(69.1		)
Financing activities	33.8			0.4
Net increase (decrease) in cash and cash equivalents	$	32.5		$	(133.9	)

Operating Activities

Net cash used in operating activities reflects, among other things, the amounts used to run our clinical trials and preclinical activities. The increase in net cash used in operating activities during the six months ended June 30, 2017 compared to the six months ended June 30, 2016 was primarily due to higher research and development expenses.

Investing Activities

Net cash provided by investing activities during the six months ended June 30, 2017 is primarily due to maturities of marketable securities partially offset by purchases of marketable securities and making leasehold improvements to our facilities, including the build-out of our manufacturing suite at our headquarters location.  Net cash used in investing activities during the six months ended June 30, 2016 was primarily due to investing our cash in marketable securities.

Financing Activities

Net cash provided by financing activities for the six months ended June 30, 2017 reflects cash proceeds from our securities offerings of approximately $33.4 million, cash from stock option exercises and proceeds from the purchase of shares under our employee stock purchase plan.  Net cash provided by financing activities for the six months ended June 30, 2016 reflects cash from stock option exercises.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements, as defined under the rules and regulations of the Securities and Exchange Commission.

18

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our primary objective when considering our investment activities is to preserve capital in order to fund our operations. We also seek to maximize income from our investments without assuming significant risk.  Our current investment policy is to invest principally in deposits and securities issued by the U.S. government and its agencies, Government Sponsored Enterprise agency debt obligations, corporate debt obligations and money market instruments.  As of June 30, 2017, we had cash, cash equivalents and marketable securities of $243.7 million. Our primary exposure to market risk is related to changes in interest rates.  Due to the short-term maturities of our cash equivalents and marketable securities and the low risk profile of our marketable securities, an immediate 100 basis point change in interest rates would not have a material effect on the fair market value of our cash equivalents and marketable securities. We have the ability to hold our marketable securities until maturity, and we therefore do not expect a change in market interest rates to affect our operating results or cash flows to any significant degree.

ITEM 4. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

Our management, including our principal executive officer and principal financial officer, has evaluated the effectiveness of our disclosure controls and procedures as of June 30, 2017. Our disclosure controls and procedures are designed to provide reasonable assurance that the information required to be disclosed in our periodic reports filed with the SEC (such as this Form 10-Q) has been appropriately recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms, and that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure. Based on their evaluation of our disclosure controls and procedures as of June 30, 2017, our principal executive officer and principal financial officer have concluded that our disclosure controls and procedures are effective at the reasonable assurance level.

Changes in Internal Control

No change in our internal control over financial reporting has occurred during the three months ended June 30, 2017, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

Item 1A. Risk Factors

Our material risk factors are disclosed in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2016. There have been no material changes from the risk factors previously disclosed in our Annual Report.

19

Item 6. Exhibits

10.1*	2016 Employee Stock Purchase Plan (incorporated by reference to Exhibit 4.1 to the Registration Statement on Form S-8 (File No. 333-214386) filed by the Company on November 2, 2016)
31.1	Rule 13a-14(a) Certification of Principal Executive Officer
31.2	Rule 13a-14(a) Certification of Principal Financial Officer
32.1	Section 1350 Certification of Principal Executive Officer
32.2	Section 1350 Certification of Principal Financial Officer
101.INS	XBRL Instance Document
101.SCH	XBRL Schema Document
101.CAL	XBRL Calculation Linkbase Document
101.DEF	XBRL Definition Linkbase Document
101.LAB	XBRL Labels Linkbase Document
101.PRE	XBRL Presentation Linkbase Document
* Indicates management contract or compensatory plan

SIGNATURES

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

	MACROGENICS, INC.
	BY:	/s/ Scott Koenig
		Scott Koenig, M.D., Ph.D.
		President and Chief Executive Officer
		(Principal Executive Officer)
	BY:	/s/ James Karrels
		James Karrels
		Senior Vice President and Chief Financial Officer
		(Principal Financial Officer)
Dated: August 2, 2017

EXHIBIT INDEX

Exhibit Page Number
10.1*	2016 Employee Stock Purchase Plan (incorporated by reference to Exhibit 4.1 to the Registration Statement on Form S-8 (File No. 333-214386) filed by the Company on November 2, 2016)
31.1	Rule 13a-14(a) Certification of Principal Executive Officer
31.2	Rule 13a-14(a) Certification of Principal Financial Officer
32.1	Section 1350 Certification of Principal Executive Officer
32.2	Section 1350 Certification of Principal Financial Officer
101.INS	XBRL Instance Document
101.SCH	XBRL Schema Document
101.CAL	XBRL Calculation Linkbase Document
101.DEF	XBRL Definition Linkbase Document
101.LAB	XBRL Labels Linkbase Document
101.PRE	XBRL Presentation Linkbase Document
* Indicates management contract or compensatory plan

EX-31.1

EXHIBIT 31.1

I, Scott Koenig, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the period ended June 30, 2017 of MacroGenics, 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.

/s/ Scott Koenig

Scott Koenig, M.D., Ph.D.

President and Chief Executive Officer

(Principal Executive Officer)

Dated: August 2, 2017

EX-31.2

EXHIBIT 31.2

I, James Karrels, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the period ended June 30, 2017 of MacroGenics, 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.

/s/ James Karrels

James Karrels

Senior Vice President and Chief Financial Officer

(Principal Financial Officer)

Dated: August 2, 2017

EX-32.1

EXHIBIT 32.1

Certification of Principal Executive OfficerPursuant to 18 U.S.C. 1350(Section 906 of the Sarbanes-Oxley Act of 2002)

I, Scott Koenig, President and Chief Executive Officer (principal executive officer) of MacroGenics, Inc. (the Registrant), certify, to the best of my knowledge, based upon a review of the Quarterly Report on Form 10-Q for the period ended June 30, 2017 of the Registrant (the Report), that:

(1) The Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934, as amended; and

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

/s/ Scott Koenig

Name: Scott Koenig, M.D., Ph.D.

Date: August 2, 2017

EX-32.2

EXHIBIT 32.2

Certification of Principal Financial OfficerPursuant to 18 U.S.C. 1350(Section 906 of the Sarbanes-Oxley Act of 2002)

I, James Karrels, Senior Vice President and Chief Financial Officer (principal financial officer) of MacroGenics, Inc. (the Registrant), certify, to the best of my knowledge, based upon a review of the Quarterly Report on Form 10-Q for the period ended June 30, 2017 of the Registrant (the Report), that:

(1) The Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934, as amended; and

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

/s/ James Karrels

Name: James Karrels

Date: August 2, 2017

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Entity Registrant Name	MACROGENICS INC
Entity Central Index Key	0001125345
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		36,798,465

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 116,627	$ 84,098
Marketable securities	127,033	192,898
Accounts receivable	1,991	2,764
Prepaid expenses	4,008	3,483
Other current assets	455	704
Total current assets	250,114	283,947
Property and equipment, net	23,179	17,961
Marketable securities, non-current	0	7,986
Other assets	1,553	1,369
Total assets	274,846	311,263
Current liabilities:
Accounts payable	2,088	3,995
Accrued expenses	22,319	16,134
Deferred revenue	3,202	4,261
Deferred rent	1,160	1,319
Lease exit liability	1,120	1,593
Total current liabilities	29,889	27,302
Deferred revenue, net of current portion	9,238	10,045
Deferred rent, net of current portion	4,371	4,867
Lease exit liability, net of current portion	0	298
Total liabilities	43,498	42,512
Stockholders' equity:
Common stock, $0.01 par value – 125,000,000 shares authorized, 36,680,522 and 34,870,607 shares outstanding at June 30, 2017 and December 31, 2016, respectively	367	349
Additional paid-in capital	602,085	561,198
Accumulated deficit	(371,024)	(292,714)
Accumulated other comprehensive loss	(80)	(82)
Total stockholders' equity	231,348	268,751
Total liabilities and stockholders' equity	$ 274,846	$ 311,263

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	125,000,000	125,000,000
Common stock, shares outstanding (in shares)	36,680,522	34,870,607

XML

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Revenue from collaborative agreements	$ 1,081	$ 78,497	$ 2,359	$ 80,390
Revenue from government agreements	585	2,176	1,361	3,129
Total revenues	1,666	80,673	3,720	83,519
Costs and expenses:
Research and development	34,461	33,340	67,262	60,686
General and administrative	8,384	7,239	15,846	13,372
Total costs and expenses	42,845	40,579	83,108	74,058
Income (loss) from operations	(41,179)	40,094	(79,388)	9,461
Other income	525	370	1,078	640
Net income (loss)	(40,654)	40,464	(78,310)	10,101
Other comprehensive income (loss):
Unrealized gain (loss) on investments	25	7	(1)	64
Comprehensive income (loss)	$ (40,629)	$ 40,471	$ (78,311)	$ 10,165
Basic net income (loss) per common share (in usd per share)	$ (1.14)	$ 1.17	$ (2.21)	$ 0.29
Diluted net income (loss) per common share (in usd per share)	$ (1.14)	$ 1.12	$ (2.21)	$ 0.28
Basic weighted average common shares outstanding (in shares)	35,784,804	34,616,197	35,373,799	34,560,021
Diluted weighted average common shares outstanding (in shares)	35,784,804	36,017,411	35,373,799	35,966,987

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income (loss)	$ (78,310)	$ 10,101
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization expense	3,981	3,557
Share-based compensation	7,063	6,124
Changes in operating assets and liabilities:
Accounts receivable	773	(77,151)
Prepaid expenses	(525)	(1,976)
Other assets	65	(426)
Accounts payable	(2,026)	(355)
Accrued expenses	6,185	866
Lease exit liability	(771)	(2,134)
Deferred revenue	(1,866)	(3,179)
Deferred rent	(655)	(563)
Net cash used in operating activities	(66,086)	(65,136)
Cash flows from investing activities
Purchases of marketable securities	(56,937)	(202,392)
Proceeds from sale and maturities of marketable securities	130,505	141,611
Purchases of property and equipment	(8,795)	(8,339)
Net cash provided by (used in) investing activities	64,773	(69,120)
Cash flows from financing activities
Proceeds from issuance of common stock, net of offering costs	33,175	0
Proceeds from stock option exercises and ESPP purchases	667	351
Net cash provided by financing activities	33,842	351
Net change in cash and cash equivalents	32,529	(133,905)
Cash and cash equivalents at beginning of period	84,098	196,172
Cash and cash equivalents at end of period	$ 116,627	$ 62,267

XML

Basis of Presentation and Recently Issued Accounting Standards

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Recently Issued Accounting Standards

Basis of Presentation and Recently Issued Accounting Standards

Basis of Presentation

The accompanying unaudited interim consolidated financial statements of MacroGenics, Inc. (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information. The financial statements include all adjustments (consisting only of normal recurring adjustments) that the management of the Company believes are necessary for a fair presentation of the periods presented. These interim financial results are not necessarily indicative of results expected for the full fiscal year or for any subsequent interim period.

The accompanying unaudited interim consolidated financial statements include the accounts of MacroGenics, Inc. and its wholly owned subsidiary, MacroGenics UK Limited. All intercompany accounts and transactions have been eliminated in consolidation. These consolidated financial statements and related notes should be read in conjunction with the financial statements and notes thereto included in the Company's 2016 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 28, 2017.

There have been no material changes to the significant accounting policies previously disclosed in the Company's 2016 Annual Report on Form 10-K other than the adoption of ASU No. 2015-17, Improvements to Employee Share-Based Payment Accounting, as disclosed in the Recently Issued Accounting Standards section below.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (ASU 2014-09). ASU 2014-09 will eliminate transaction- and industry-specific revenue recognition guidance under current GAAP and replace it with a principle-based approach for determining revenue recognition. ASU 2014-09 will require that companies recognize revenue based on the value of transferred goods or services as they occur in the contract. The ASU also will require additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017 and interim periods therein, with early adoption permitted for interim and annual reporting periods beginning after December 15, 2016. ASU 2014-09 may be adopted either retrospectively or on a modified retrospective basis whereby ASU 2014-09 would be applied to new contracts and existing contracts with remaining performance obligations as of the effective date, with a cumulative catch-up adjustment recorded to beginning retained earnings at the effective date for existing contracts with remaining performance obligations. In 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations, ASU 2016-10,  Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing, and ASU 2016-12, Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients  to provide supplemental adoption guidance and clarification to ASU 2014-09. The effective date for these new standards is the same as the effective date and transition requirements for ASU 2014-09. Management has begun an initial review of each of the Company's collaboration and license agreements and is performing an assessment of the potential effects of the standard on the Company's consolidated financial statements, accounting policies, and internal controls over financial reporting. The Company anticipates that the adoption of the new revenue recognition standard will have primarily two impacts on its contract revenues generated by its collaborative research and license agreements:

(i) Changes in the model for distinct licenses of functional intellectual property which may result in a timing difference of revenue recognition.  Whereas revenue from these arrangements was previously recognized over a period of time pursuant to revenue recognition guidance that was in place for the arrangements at the time such arrangements commenced, revenue from these arrangements may now be recognized at point in time under the new guidance.

(ii) Assessments of milestone payments, which are linked to events that are in the Company’s control, will result in variable consideration that may be recognized at an earlier point in time under the new guidance, when it is probable that the milestone will be achieved without a significant future reversal of cumulative revenue expected.

The Company plans to adopt the new standard effective January 1, 2018 using the modified retrospective method with the cumulative effective of initially applying the new standard recognized in retained earnings at the date of initial adoption. The Company has begun to analyze its existing revenue agreements to evaluate the impact of adoption.

In February 2016, FASB issued ASU No. 2016-02, Leases (ASU 2016-02) that provides principles for the recognition, measurement, presentation and disclosure of leases for both lessees and lessors.  ASU 2016-02 requires a lessee to recognize assets and liabilities on the balance sheet for operating leases and changes many key definitions, including the definition of a lease. ASU 2016-02 includes a short-term lease exception for leases with a term of 12 months or less, in which a lessee can make an accounting policy election not to recognize lease assets and lease liabilities. Lessees will continue to differentiate between finance leases (previously referred to as capital leases) and operating leases, using classification criteria that are substantially similar to the previous guidance. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with earlier application permitted. The Company is currently evaluating the effect of the standard on its consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, Improvementsto Employee Share-Based Payment Accounting (ASU 2016-09). This amendment addresses several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, including interim periods within that year. The Company adopted ASU 2016-09 effective January 1, 2017 and has elected to continue to estimate the number of stock-based awards expected to vest, as permitted by ASU 2016-09, rather than electing to account for forfeitures as they occur. The adoption of this standard did not have a material impact on the Company's financial statements or related disclosures.

XML

Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The Company's financial instruments consist of cash and cash equivalents, marketable securities, accounts receivable, accounts payable and accrued expenses.The carrying amount of accounts receivable, accounts payable and accrued expenses are generally considered to be representative of their respective fair values because of their short-term nature.  The Company accounts for recurring and non-recurring fair value measurements in accordance with FASB Accounting Standards Codification (ASC) 820, Fair Value Measurements and Disclosures (ASC 820). ASC 820 defines fair value, establishes a fair value hierarchy for assets and liabilities measured at fair value, and requires expanded disclosures about fair value measurements. The ASC 820 hierarchy ranks the quality of reliability of inputs, or assumptions, used in the determination of fair value and requires assets and liabilities carried at fair value to be classified and disclosed in one of the following three categories:

• Level 1 - Fair value is determined by using unadjusted quoted prices that are available in active markets for identical assets and liabilities.

• Level 2 - Fair value is determined by using inputs other than Level 1 quoted prices that are directly or indirectly observable. Inputs can include quoted prices for similar assets and liabilities in active markets or quoted prices for identical assets and liabilities in inactive markets. Related inputs can also include those used in valuation or other pricing models, such as interest rates and yield curves that can be corroborated by observable market data.

• Level 3 - Fair value is determined by inputs that are unobservable and not corroborated by market data. Use of these inputs involves significant and subjective judgments to be made by a reporting entity - e.g., determining an appropriate adjustment to a discount factor for illiquidity associated with a given security.

The Company evaluates financial assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level at which to classify them each reporting period. This determination requires the Company to make subjective judgments as to the significance of inputs used in determining fair value and where such inputs lie within the ASC 820 hierarchy.

Financial assets measured at fair value on a recurring basis were as follows (in thousands):

	Fair Value Measurements at June 30, 2017
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	92,815	$	92,815	$	—	$	—
U.S. Treasury securities	13,782		—		13,782		—
Government-sponsored enterprises	26,129		—		26,129		—
Corporate debt securities	87,122		—		87,122		—
Total assets measured at fair value(a)	$	219,848	$	92,815	$	127,033	$	—

(a) Total assets measured at fair value at June 30, 2017 includes approximately $92.8 million reported in cash and cash equivalents on the balance sheet.

	Fair Value Measurements at December 31, 2016
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	46,781	$	46,781	$	—	$	—
U.S. Treasury securities	8,826		—		8,826		—
Government-sponsored enterprises	29,759		—		29,759		—
Corporate debt securities	166,300		—		166,300		—
Total assets measured at fair value(a)	$	251,666	$	46,781	$	204,885	$	—

(a) Total assets measured at fair value at December 31, 2016 includes approximately $50.8 million reported in cash and cash equivalents on the balance sheet.

The fair value of Level 2 securities is determined from market pricing and other observable market inputs for similar securities obtained from various third-party data providers. These inputs either represent quoted prices for similar assets in active markets or have been derived from observable market data. There were no transfers between Level 1 and Level 2 investments during the periods presented.

XML

Marketable Securities

6 Months Ended

Jun. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

Marketable Securities

Available-for-sale marketable securities as of June 30, 2017 and December 31, 2016 were as follows (in thousands):

	June 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	13,802	$	—	$	(20	)	$	13,782
Government-sponsored enterprises	26,159		—		(30		)	26,129
Corporate debt securities	87,152		5		(35		)	87,122
Total	$	127,113	$	5	$	(85	)	$	127,033

	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	4,826	$	—	$	(1	)	$	4,825
Government-sponsored enterprises	29,764		5		(10		)	29,759
Corporate debt securities	166,376		51		(127		)	166,300
Total	$	200,966	$	56	$	(138	)	$	200,884

All available-for-sale marketable securities held as of June 30, 2017 had contractual maturities of less than one year. All of the Company's available-for-sale marketable securities in an unrealized loss position as of June 30, 2017 and December 31, 2016 were in a loss position for less than twelve months.  There were no unrealized losses at June 30, 2017 or December 31, 2016 that the Company determined to be other-than-temporary.

XML

Lease Exit Liability

6 Months Ended

Jun. 30, 2017

Restructuring and Related Activities [Abstract]

Lease Exit Liability

Lease Exit Liability

In 2008, the Company acquired Raven Biotechnologies, Inc. (Raven), a private South San Francisco-based company focused on the development of monoclonal antibody therapeutics for treating cancer. The Company undertook restructuring activities related to the acquisition of Raven. In connection with these restructuring activities, as part of the cost of acquisition, the Company established a restructuring liability attributed to an existing operating lease.  During the year ended December 31, 2016, the Company entered into an agreement to sublease a portion of the space subject to this operating lease.  The Company will receive approximately $1.3 million in sublease payments over its term, which ends at the same time as the original lease in February 2018.  No sublease income was contemplated when the restructuring liability was recorded in 2008; therefore, the Company adjusted the liability to reflect the future sublease income during the year ended December 31, 2016 and recorded an offset to research and development expenses of approximately $1.3 million in the same period.

Changes in the lease exit liability are as follows (in thousands):

Accrual balance at December 31, 2016	$	1,891
Principal payments	(771		)
Accrual balance at June 30, 2017	$	1,120

XML

Stockholders' Equity

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Stockholders' Equity

Stockholders' Equity

On April 26, 2017, the Company entered into a definitive agreement with an institutional healthcare investor to purchase 1,100,000 shares of its common stock at a purchase price of $21.50 per share in a registered direct offering. Gross proceeds to the Company, before deducting estimated offering expenses, were $23.7 million. The shares were offered pursuant to the Company’s shelf registration on Form S-3 that was filed with the SEC on November 2, 2016.

On May 3, 2017, the Company entered into a sales agreement with an agent to sell, from time to time, shares of its common stock having an aggregate sales price of up to $75.0 million through an “at the market offering” (ATM Offering) as defined in Rule 415 under the Securities Act of 1933, as amended. The shares that may be sold under the sales agreement would be issued and sold pursuant to the Company's shelf registration statement on Form S-3 that was filed with the SEC on November 2, 2016. Through June 30, 2017, the Company sold 536,942 shares of common stock under the sales agreement, resulting in net proceeds of $9.7 million related to the ATM Offering.

XML

Collaboration and Other Agreements

6 Months Ended

Jun. 30, 2017

Collaboration and License Agreements [Abstract]

Collaboration and Other Agreements

Collaboration and Other Agreements

Janssen Biotech, Inc.

In December 2014, the Company entered into a collaboration and license agreement with Janssen Biotech, Inc. (Janssen) for the development and commercialization of MGD011 (also known as duvortuxizumab), a product candidate that incorporates the Company's proprietary DART® technology to simultaneously target CD19 and CD3 for the potential treatment of B-cell hematological malignancies (MGD011 Agreement). The Company contemporaneously entered into an agreement with Johnson & Johnson Innovation - JJDC, Inc. (JJDC) under which JJDC agreed to purchase 1,923,077 new shares of the Company's common stock for proceeds of $75.0 million.  Upon closing the transaction in January 2015, the Company received a $50.0 million upfront payment from Janssen as well as the $75.0 million investment in the Company's common stock.  

Under the MGD011 Agreement, the Company granted an exclusive license to Janssen to develop and commercialize duvortuxizumab. Following the Company's submission of the Investigational New Drug (IND) application, Janssen became fully responsible for the development and commercialization of duvortuxizumab.  Assuming successful development and commercialization, the agreement entitles the Company to receive up to $205.0 million in development milestone payments, $220.0 million in regulatory milestone payments and $150.0 million in sales milestone payments. The Company determined that each potential future clinical and regulatory milestone is substantive.  Although the sales milestones are not considered substantive, they will be recognized upon achievement of the milestone (assuming all other revenue recognition criteria have been met) because there are no undelivered elements that would preclude revenue recognition at that time.  The Company may elect to fund a portion of late-stage clinical development in exchange for a profit share with Janssen in the U.S. and Canada. If commercialized, the Company would be eligible to receive low double-digit royalties on any global net sales and has the option to co-promote the molecule with Janssen in the United States.

The Company evaluated the MGD011 Agreement and determined that it is a revenue arrangement with multiple deliverables, or performance obligations.  The Company's substantive performance obligations under the collaboration and license agreement include the delivery of an exclusive license and research and development services during the preclinical research period (through the filing of the IND application for duvortuxizumab).   The Company evaluated the MGD011 Agreement and determined that the license and preclinical research and development activities each represented separate deliverables and were accounted for as separate units of accounting.  The Company concluded that the license had standalone value to Janssen and was separable from the research and development services because the license was sublicensable, there were no restrictions as to Janssen's use of the license and Janssen or other third parties have significant research capabilities in this field.  Thus, the total arrangement consideration for these two deliverables was allocated using the relative best estimate of selling price method to each deliverable.  The best estimate of selling price for the exclusive license was determined using a discounted cash flow model that includes Level 3 fair value measurements. The best estimate of selling price for the research and development services was determined using other similar research and development arrangements, which are Level 2 fair value measurements.

The Company evaluated the stock purchase agreement and the collaboration and license agreement as one arrangement and determined that the stock purchase price of $39.00 per share exceeded the fair value of the common stock by $12.3 million. This excess was recognized in the same manner as the upfront payment allocated to the license and preclinical research and development activities.  Of the total arrangement consideration of $125.0 million, the Company allocated $62.7 million to equity (representing the fair value of common stock purchased), $62.3 million to the license and preclinical research and development activities, and a de minimis amount to the ongoing research and development activities.  The Company submitted the IND application and therefore met its performance obligation during the year ended December 31, 2015.

There was no revenue recognized under the MGD011 Agreement during any of the three or six-month periods ended June 30, 2017 or 2016.

In May 2016, the Company entered into a separate collaboration and license agreement with Janssen, a related party through ownership of the Company's common stock, for the development and commercialization of MGD015 (also known as JNJ-9383), a product candidate that incorporates the Company's proprietary DART technology to simultaneously target CD3 and an undisclosed tumor target for the potential treatment of various hematological malignancies and solid tumors (MGD015 Agreement). The transaction closed in June 2016, and the Company received the $75.0 million upfront payment from Janssen in July 2016.  

Under the MGD015 Agreement, the Company granted an exclusive license to Janssen to develop and commercialize MGD015. Janssen will complete the IND-enabling activities and will be fully responsible for the future clinical development and commercialization of MGD015.   Assuming successful development and commercialization, the agreement entitles the Company to receive up to $100.0 million in development milestone payments, $265.0 million in regulatory milestone payments and $300.0 million in sales milestone payments. The Company determined that each potential future clinical and regulatory milestone is substantive.  Although the sales milestones are not considered substantive, they will be recognized upon achievement of the milestone (assuming all other revenue recognition criteria have been met) because there are no undelivered elements that would preclude revenue recognition at that time.  The Company may elect to fund a portion of late-stage clinical development in exchange for a profit share with Janssen in the U.S. and Canada. If commercialized, the Company would be eligible to receive low double-digit royalties on any global net sales and has the option to co-promote the molecule with Janssen in the United States.

The Company evaluated the MGD015 Agreement and determined that it is a revenue arrangement with multiple deliverables, or performance obligations.  The Company's substantive performance obligations under the MGD015 Agreement include the delivery of an exclusive license and research and development services during the preclinical research period.   The Company evaluated the MGD015 Agreement and determined that the license and preclinical research and development activities each represented separate deliverables and were accounted for as two separate units of accounting.  The Company concluded that the license had standalone value to Janssen and was separable from the research and development services because the license was sublicensable, there were no restrictions as to Janssen's use of the license and Janssen or other third parties have significant research capabilities in this field.  Thus, the total arrangement consideration for these two deliverables was allocated using the best estimate of relative selling price method to each deliverable.  The best estimate of selling price for the exclusive license was determined using information from the previous collaboration and license agreement with Janssen as well as other third party collaboration and license agreements, which are Level 2 fair value measurements. The best estimate of selling price for the research and development services was determined using other similar research and development arrangements, which are also Level 2 fair value measurements.

The company recognized $0.2 million and $0.3 million of revenue under the MGD015 Agreement during the three and six months ended June 30, 2017, respectively. No revenue was recognized under the MGD015 Agreement during the three and six months ended June 30, 2016.

Les Laboratoires Servier

In September 2012, the Company entered into a right-to-develop collaboration agreement with Les Laboratoires Servier and Institut de Recherches Servier (collectively, Servier) and granted it options to obtain three separate exclusive licenses to develop and commercialize DART molecules, consisting of those designated by the Company as flotetuzumab (also known as MGD006 or S80880) and MGD007, as well as a third DART molecule, in all countries other than the United States, Canada, Mexico, Japan, South Korea and India. During 2014, Servier exercised its exclusive option to develop and commercialize flotetuzumab, and during 2016 Servier notified the Company that it did not intend to exercise the option for the third DART molecule. Servier retains the option to obtain a license for MGD007.

Upon execution of the agreement, Servier made a nonrefundable payment of $20.0 million to the Company. In addition, the Company will be eligible to receive up to $40.0 million in license fees, $63.0 million in clinical milestone payments, $188.0 million in regulatory milestone payments and $420.0 million in sales milestone payments if Servier exercises the remaining available options and successfully develops, obtains regulatory approval for, and commercializes a product under each license. In addition to these milestones, the Company and Servier will share Phase 2 and Phase 3 development costs. The Company has determined that each potential future clinical and regulatory milestone is substantive. Although sales milestones are not considered substantive, they are still recognized upon achievement of the milestone (assuming all other revenue recognition criteria have been met) because there are no undelivered elements that would preclude revenue recognition at that time. Under this agreement, Servier would be obligated to pay the Company from low double-digit to mid-teen royalties on net product sales in its territories.

The Company evaluated the research collaboration agreement with Servier and determined that it is a revenue arrangement with multiple deliverables, or performance obligations. The Company concluded that each option is substantive and that the license fees for each option are not deliverables at the inception of the arrangement and were not issued with a substantial discount. The Company's substantive performance obligations under this research collaboration include an exclusivity clause to its technology, technical, scientific and intellectual property support to the research plan and participation on an executive committee and a research and development committee. The Company determined that the performance obligations with respect to the preclinical development represent a single unit of accounting, since the license does not have stand-alone value to Servier without the Company's technical expertise and committee participation. As such, the initial upfront license payment was deferred and initially recognized ratably over a 29-month period, which represented the expected development period. During 2014, the Company and Servier further refined the research plan related to the three DART molecules and as such, the development period was extended.  Based on this revised development period, the Company prospectively adjusted its period of recognition of the upfront payment to a 75-month period. The impact of this change in accounting estimate reduced revenue that would have been recognized in 2014 by $3.7 million.

As a result of Servier exercising its option in 2014, the Company received a $15.0 million payment from Servier for its license to develop and commercialize flotetuzumab in its territories.  Upon exercise of the option, the Company evaluated its performance obligations with respect to the license for flotetuzumab. The Company's substantive performance obligations under this research collaboration include an exclusive license to its technology, technical, scientific and intellectual property support to the research plan and participation on an executive committee and a research and development committee. The Company determined that the performance obligations with respect to the clinical development represent a single unit of accounting, since the license does not have stand-alone value to Servier without the Company's technical expertise and committee participation. As such, the $15.0 million license fee was deferred and was being recognized ratably over a period of 82 months, which represented the expected development period for flotetuzumab. During the three months ended June 30, 2017, the Company and Servier determined that the expected development period should be extended to 124 months.  The impact of this change in accounting estimate reduced revenue that would have been recognized in 2017 by $0.8 million. In accordance with the agreement, the Company and Servier will share costs incurred to develop flotetuzumab.  Reimbursement of research and development expenses received in connection with this collaborative cost-sharing agreement is recorded as a reduction to research and development expense. During the three months ended June 30, 2017 and 2016, the Company recorded approximately $0.4 million and $0.7 million as an offset to research and development costs under this collaboration agreement, respectively. During the six months ended June 30, 2017 and 2016, the Company recorded approximately $0.9 million and $1.1 million as an offset to research and development costs under this collaboration agreement, respectively. 

The Company recognized revenue under this agreement of $0.6 million and $0.8 million during the three months ended June 30, 2017 and 2016, respectively. The Company recognized revenue under this agreement of $1.4 million and $1.7 million during the six months ended June 30, 2017 and 2016, respectively. At June 30, 2017, $9.7 million of revenue was deferred under this agreement, $2.3 million of which was current and $7.4 million of which was non-current. At December 31, 2016, $11.1 million of revenue was deferred under this agreement, $3.3 million of which was current and $7.8 million of which was non-current. 

NIAID Contract

The Company entered into a contract with the National Institute of Allergy and Infectious Diseases (NIAID), effective as of September 15, 2015, to perform product development and to advance up to two DART molecules, including MGD014. Under this contract, the Company will develop these product candidates for Phase 1/2 clinical trials as therapeutic agents, in combination with latency reversing treatments, to deplete cells infected with human immunodeficiency virus (HIV) infection. This contract includes a base period of $7.5 million to support development of MGD014 through IND application submission with the FDA, as well as up to $17.0 million in additional development funding via NIAID options. Should NIAID fully exercise such options, the Company could receive total payments of up to $24.5 million. The total potential period of performance under the award is from September 15, 2015 through September 14, 2022. The Company recognized $0.4 million and $2.1 million in revenue under this contract during the three months ended June 30, 2017 and 2016, respectively. The Company recognized $1.0 million and $3.1 million in revenue under this contract during the six months ended June 30, 2017 and 2016, respectively.

XML

Stock-Based Compensation

6 Months Ended

Jun. 30, 2017

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

Stock-Based Compensation

Stock-Based Compensation

Employee Stock Purchase Plan

In May 2017, the Company’s stockholders approved the 2016 Employee Stock Purchase Plan (the 2016 ESPP). The 2016 ESPP is structured as a qualified employee stock purchase plan under Section 423 of the Internal Revenue Code of 1986, as amended, and is not subject to the provisions of the Employee Retirement Income Security Act of 1974. The Company reserved 800,000 shares of common stock for issuance under the 2016 ESPP. The 2016 ESPP allows eligible employees to purchase shares of the Company’s common stock at a discount through payroll deductions of up to 10% of their eligible compensation, subject to any plan limitations. The 2016 ESPP provides for six-month offering periods ending on May 31 and November 30 of each year. At the end of each offering period, employees are able to purchase shares at 85% of the fair market value of the Company’s common stock on the last day of the offering period. During the three and six months ended June 30, 2017, employees purchased 19,351 shares of common stock under the ESPP plan for net proceeds to the Company of approximately $0.3 million.

Employee Stock Option Plans

Effective February 2003, the Company implemented the 2003 Equity Incentive Plan (2003 Plan), and it was amended and approved by the Company's stockholders in 2005. The 2003 Plan originally allowed for the grant of awards in respect of an aggregate of 2,051,644 shares of the Company's common stock. Between 2006 and 2012, the maximum number of shares of common stock authorized to be issued by the Company under the 2003 Plan was increased to 4,336,730. Stock options granted under the 2003 Plan may be either incentive stock options as defined by the Internal Revenue Code (IRC), or non-qualified stock options.

In 2013, the 2003 Plan was terminated, and no further awards may be issued under the plan. Any shares of common stock subject to awards under the 2003 Plan that expire, terminate, or are otherwise surrendered, canceled, forfeited or repurchased without having been fully exercised, or resulting in any common stock being issued, will become available for issuance under the Company's 2013 Stock Incentive Plan (2013 Plan), up to a specified number of shares.  As of June 30, 2017, under the 2003 Plan, there were options to purchase an aggregate of 1,053,487 shares of common stock outstanding at a weighted average exercise price of $1.85 per share.

Under the provisions of the 2013 Plan, the number of shares of common stock reserved for issuance will automatically increase on January 1 of each year from January 1, 2014 through and including January 1, 2023, by the lesser of (a) 1,960,168 shares, (b) 4.0% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year, or (c) the number of shares of common stock determined by the Board of Directors. During the six months ended June 30, 2017, the maximum number of shares of common stock authorized to be issued by the Company under the 2013 Plan was increased to 6,769,888.   As of June 30, 2017, there were options to purchase an aggregate of 3,567,521 shares of common stock outstanding at a weighted average exercise price of $24.88 per share under the 2013 Plan.

The following table shows stock-based compensation expense for stock options, RSUs and ESPP (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Research and development	$	1,833	$	1,445	$	3,506	$	2,841
General and administrative	1,769		1,678		3,557		3,283
Total stock-based compensation expense	$	3,602	$	3,123	$	7,063	$	6,124

The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model using the assumptions in the following table for options issued during the period indicated:

	Six Months Ended June 30,
	2017	2016
Expected dividend yield	0%	0%
Expected volatility	66.7% - 67.7%	63.7% - 65.4%
Risk-free interest rate	2.0% - 2.3%	1.3% - 2.1%
Expected term	6.25 years	6.25 years

The following table summarizes stock option and restricted stock unit (RSU) activity during the six months ended June 30, 2017:

	Shares		Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2016	3,838,060		$	18.93	7.0
Granted	1,120,950		20.38
Exercised	(155,484	)	2.36
Forfeited or expired	(182,518	)	24.13
Outstanding, June 30, 2017	4,621,008		19.63		7.2	$	17,581
As of June 30, 2017:
Exercisable	2,534,628		15.86		5.8	16,784
Vested and expected to vest	4,407,535		19.37		7.1	17,489

The weighted-average grant-date fair value of options granted for the six months ended June 30, 2017 was $12.73. The total intrinsic value of options exercised during the six months ended June 30, 2017 was approximately $2.6 million, and the total cash received for options exercised was approximately $0.3 million. The total fair value of shares vested in the six months ended June 30, 2017 was approximately $6.1 million. As of June 30, 2017, the total unrecognized compensation expense related to non-vested stock options, net of related forfeiture estimates, was approximately $26.5 million, which the Company expects to recognize over a weighted-average period of approximately 2.6 years.

XML

Commitments and Contingencies

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Operating Leases

The Company leases manufacturing, office and laboratory space in Rockville, Maryland under five leases that have terms that expire between 2018 and 2023 unless renewed.   During the three months ended June 30, 2017, one of these leases was renewed for an additional five years. The Rockville leases include a seven-year lease executed in July 2015 for additional space that the Company intends to use as mixed-use office, laboratory and manufacturing space.   Under the terms of the lease, which commenced on January 1, 2016, the Company received an assignment fee from the former tenant and a tenant improvement allowance from the landlord totaling $5.1 million, which has been recorded as deferred rent and will be recognized over the lease term.   The Company also leases office and laboratory space in South San Francisco under a lease that expires on February 28, 2018. During the year ended December 31, 2016, the Company entered into a sublease agreement for a portion of the South San Francisco space (see Note 4). As of June 30, 2017, future payments to be received by the Company under this sublease total approximately $0.5 million. In April 2017, the Company entered into a 72-month lease commencing December 1, 2017 for office and laboratory space which will be occupied upon the termination of the current South San Francisco lease.

All of the leases contain rent escalation clauses and certain leases contain rent abatements.  For financial reporting purposes, rent expense is charged to operations on a straight-line basis over the term of the lease.  

Future minimum lease payments under noncancelable operating leases as of June 30, 2017 are as follows (in thousands):

Year Ended December 31,
2017	$	6,391
2018	5,346
2019	5,077
2020	3,454
2021	3,926
Thereafter	5,129
	$	29,323

Contingencies

From time to time, the Company may be subject to various litigation and related matters arising in the ordinary course of business. The Company does not believe it is currently subject to any material matters where there is at least a reasonable possibility that a material loss may be incurred.

XML

Net Income (Loss) Per Share

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

Net Income (Loss) Per Share

Basic income (loss) per common share is determined by dividing income (loss) attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. Diluted income (loss) per share is computed by dividing the income (loss) attributable to common stockholders by the weighted-average number of common stock equivalents outstanding for the period. The treasury stock method is used to determine the dilutive effect of the Company's stock option grants. 4,621,008 stock options (common stock equivalents) were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2017, respectively, because their inclusion would have been anti-dilutive. 257,678 and 114,148 stock options were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2016, respectively, because their inclusion would have been anti-dilutive.

Basic and diluted income (loss) per common share is computed as follows (in thousands except share and per share data):

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017			2016
Numerator:
Net income (loss) used for calculation of basic and diluted EPS	$	(40,654	)	$	40,464	$	(78,310	)	$	10,101
Denominator:
Weighted average shares outstanding, basic	35,784,804			34,616,197		35,373,799			34,560,021
Effect of dilutive securities:
Stock options and restricted stock units	—			1,401,214		—			1,406,966
Weighted average shares outstanding, diluted	35,784,804			36,017,411		35,373,799			35,966,987
Net income (loss) per share, basic	$	(1.14	)	$	1.17	$	(2.21	)	$	0.29
Net income (loss) per share, diluted	$	(1.14	)	$	1.12	$	(2.21	)	$	0.28

XML

Subsequent Event

6 Months Ended

Jun. 30, 2017

Subsequent Events [Abstract]

Subsequent Event

Subsequent Events

On July 6, 2017, the Company entered into an agreement to sublease a portion of the space it leases in Rockville, MD. Under the terms of the sublease, which commences August 1, 2017, the Company will receive a total of $2.4 million over the 30 month term.

On July 21, 2017, the Company executed a lease amendment for its headquarters building in Rockville, MD. This amendment extends the term of the lease to August 2027, restructures the rent due under the lease, and provides for an additional tenant improvement allowance from the landlord of $7.5 million. Future rent payments under the amended lease will increase by $23.5 million, which is not reflected in the future minimum lease payments table in Note 8.

XML

Basis of Presentation and Recently Issued Accounting Standards (Policies)

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited interim consolidated financial statements of MacroGenics, Inc. (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information. The financial statements include all adjustments (consisting only of normal recurring adjustments) that the management of the Company believes are necessary for a fair presentation of the periods presented. These interim financial results are not necessarily indicative of results expected for the full fiscal year or for any subsequent interim period.

The accompanying unaudited interim consolidated financial statements include the accounts of MacroGenics, Inc. and its wholly owned subsidiary, MacroGenics UK Limited. All intercompany accounts and transactions have been eliminated in consolidation. These consolidated financial statements and related notes should be read in conjunction with the financial statements and notes thereto included in the Company's 2016 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 28, 2017.

There have been no material changes to the significant accounting policies previously disclosed in the Company's 2016 Annual Report on Form 10-K other than the adoption of ASU No. 2015-17, Improvements to Employee Share-Based Payment Accounting, as disclosed in the Recently Issued Accounting Standards section below.

Recently Issued Accounting Standards

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (ASU 2014-09). ASU 2014-09 will eliminate transaction- and industry-specific revenue recognition guidance under current GAAP and replace it with a principle-based approach for determining revenue recognition. ASU 2014-09 will require that companies recognize revenue based on the value of transferred goods or services as they occur in the contract. The ASU also will require additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017 and interim periods therein, with early adoption permitted for interim and annual reporting periods beginning after December 15, 2016. ASU 2014-09 may be adopted either retrospectively or on a modified retrospective basis whereby ASU 2014-09 would be applied to new contracts and existing contracts with remaining performance obligations as of the effective date, with a cumulative catch-up adjustment recorded to beginning retained earnings at the effective date for existing contracts with remaining performance obligations. In 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations, ASU 2016-10,  Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing, and ASU 2016-12, Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients  to provide supplemental adoption guidance and clarification to ASU 2014-09. The effective date for these new standards is the same as the effective date and transition requirements for ASU 2014-09. Management has begun an initial review of each of the Company's collaboration and license agreements and is performing an assessment of the potential effects of the standard on the Company's consolidated financial statements, accounting policies, and internal controls over financial reporting. The Company anticipates that the adoption of the new revenue recognition standard will have primarily two impacts on its contract revenues generated by its collaborative research and license agreements:

(i) Changes in the model for distinct licenses of functional intellectual property which may result in a timing difference of revenue recognition.  Whereas revenue from these arrangements was previously recognized over a period of time pursuant to revenue recognition guidance that was in place for the arrangements at the time such arrangements commenced, revenue from these arrangements may now be recognized at point in time under the new guidance.

(ii) Assessments of milestone payments, which are linked to events that are in the Company’s control, will result in variable consideration that may be recognized at an earlier point in time under the new guidance, when it is probable that the milestone will be achieved without a significant future reversal of cumulative revenue expected.

The Company plans to adopt the new standard effective January 1, 2018 using the modified retrospective method with the cumulative effective of initially applying the new standard recognized in retained earnings at the date of initial adoption. The Company has begun to analyze its existing revenue agreements to evaluate the impact of adoption.

In February 2016, FASB issued ASU No. 2016-02, Leases (ASU 2016-02) that provides principles for the recognition, measurement, presentation and disclosure of leases for both lessees and lessors.  ASU 2016-02 requires a lessee to recognize assets and liabilities on the balance sheet for operating leases and changes many key definitions, including the definition of a lease. ASU 2016-02 includes a short-term lease exception for leases with a term of 12 months or less, in which a lessee can make an accounting policy election not to recognize lease assets and lease liabilities. Lessees will continue to differentiate between finance leases (previously referred to as capital leases) and operating leases, using classification criteria that are substantially similar to the previous guidance. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with earlier application permitted. The Company is currently evaluating the effect of the standard on its consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, Improvementsto Employee Share-Based Payment Accounting (ASU 2016-09). This amendment addresses several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, including interim periods within that year. The Company adopted ASU 2016-09 effective January 1, 2017 and has elected to continue to estimate the number of stock-based awards expected to vest, as permitted by ASU 2016-09, rather than electing to account for forfeitures as they occur. The adoption of this standard did not have a material impact on the Company's financial statements or related disclosures.

XML

Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Financial Assets Measured at Fair Value on a Recurring Basis

Financial assets measured at fair value on a recurring basis were as follows (in thousands):

	Fair Value Measurements at June 30, 2017
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	92,815	$	92,815	$	—	$	—
U.S. Treasury securities	13,782		—		13,782		—
Government-sponsored enterprises	26,129		—		26,129		—
Corporate debt securities	87,122		—		87,122		—
Total assets measured at fair value(a)	$	219,848	$	92,815	$	127,033	$	—

(a) Total assets measured at fair value at June 30, 2017 includes approximately $92.8 million reported in cash and cash equivalents on the balance sheet.

	Fair Value Measurements at December 31, 2016
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	46,781	$	46,781	$	—	$	—
U.S. Treasury securities	8,826		—		8,826		—
Government-sponsored enterprises	29,759		—		29,759		—
Corporate debt securities	166,300		—		166,300		—
Total assets measured at fair value(a)	$	251,666	$	46,781	$	204,885	$	—

(a) Total assets measured at fair value at December 31, 2016 includes approximately $50.8 million reported in cash and cash equivalents on the balance sheet.

XML

Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Marketable Securities

Available-for-sale marketable securities as of June 30, 2017 and December 31, 2016 were as follows (in thousands):

	June 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	13,802	$	—	$	(20	)	$	13,782
Government-sponsored enterprises	26,159		—		(30		)	26,129
Corporate debt securities	87,152		5		(35		)	87,122
Total	$	127,113	$	5	$	(85	)	$	127,033

	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	4,826	$	—	$	(1	)	$	4,825
Government-sponsored enterprises	29,764		5		(10		)	29,759
Corporate debt securities	166,376		51		(127		)	166,300
Total	$	200,966	$	56	$	(138	)	$	200,884

XML

Lease Exit Liability (Tables)

6 Months Ended

Jun. 30, 2017

Restructuring and Related Activities [Abstract]

Changes in Lease Exit Liability

Changes in the lease exit liability are as follows (in thousands):

Accrual balance at December 31, 2016	$	1,891
Principal payments	(771		)
Accrual balance at June 30, 2017	$	1,120

XML

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

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

Stock-Based Compensation Expense

The following table shows stock-based compensation expense for stock options, RSUs and ESPP (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
Research and development	$	1,833	$	1,445	$	3,506	$	2,841
General and administrative	1,769		1,678		3,557		3,283
Total stock-based compensation expense	$	3,602	$	3,123	$	7,063	$	6,124

Valuation Assumptions Using the Black-Scholes Option-Pricing Model

The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model using the assumptions in the following table for options issued during the period indicated:

	Six Months Ended June 30,
	2017	2016
Expected dividend yield	0%	0%
Expected volatility	66.7% - 67.7%	63.7% - 65.4%
Risk-free interest rate	2.0% - 2.3%	1.3% - 2.1%
Expected term	6.25 years	6.25 years

Stock Option and Restricted Stock Unit Activity

The following table summarizes stock option and restricted stock unit (RSU) activity during the six months ended June 30, 2017:

	Shares		Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2016	3,838,060		$	18.93	7.0
Granted	1,120,950		20.38
Exercised	(155,484	)	2.36
Forfeited or expired	(182,518	)	24.13
Outstanding, June 30, 2017	4,621,008		19.63		7.2	$	17,581
As of June 30, 2017:
Exercisable	2,534,628		15.86		5.8	16,784
Vested and expected to vest	4,407,535		19.37		7.1	17,489

XML

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Minimum Future Lease Payments

Future minimum lease payments under noncancelable operating leases as of June 30, 2017 are as follows (in thousands):

Year Ended December 31,
2017	$	6,391
2018	5,346
2019	5,077
2020	3,454
2021	3,926
Thereafter	5,129
	$	29,323

XML

Net Income (Loss) Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Basic and Diluted Loss Per Common Share Computation

Basic and diluted income (loss) per common share is computed as follows (in thousands except share and per share data):

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017			2016
Numerator:
Net income (loss) used for calculation of basic and diluted EPS	$	(40,654	)	$	40,464	$	(78,310	)	$	10,101
Denominator:
Weighted average shares outstanding, basic	35,784,804			34,616,197		35,373,799			34,560,021
Effect of dilutive securities:
Stock options and restricted stock units	—			1,401,214		—			1,406,966
Weighted average shares outstanding, diluted	35,784,804			36,017,411		35,373,799			35,966,987
Net income (loss) per share, basic	$	(1.14	)	$	1.17	$	(2.21	)	$	0.29
Net income (loss) per share, diluted	$	(1.14	)	$	1.12	$	(2.21	)	$	0.28

XML

Fair Value of Financial Instruments (Details) - Fair Value Measurements, Recurring Basis - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Cash and cash equivalents	$ 92,800	$ 50,800
Total assets measured at fair value	219,848	251,666
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets measured at fair value	92,815	46,781
Significant Other Observable Inputs (Level 2)
Assets:
Total assets measured at fair value	127,033	204,885
Significant Unobservable Inputs (Level 3)
Assets:
Total assets measured at fair value	0	0
Money market funds
Assets:
Cash and cash equivalents	92,815	46,781
Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	92,815	46,781
Money market funds | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Money market funds | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
U.S. Treasury securities
Assets:
Available-for-sale securities	13,782	8,826
U.S. Treasury securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available-for-sale securities	0	0
U.S. Treasury securities | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale securities	13,782	8,826
U.S. Treasury securities | Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities	0	0
Government-sponsored enterprises
Assets:
Available-for-sale securities	26,129	29,759
Government-sponsored enterprises | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available-for-sale securities	0	0
Government-sponsored enterprises | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale securities	26,129	29,759
Government-sponsored enterprises | Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities	0	0
Corporate debt securities
Assets:
Available-for-sale securities	87,122	166,300
Corporate debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Available-for-sale securities	0	0
Corporate debt securities | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale securities	87,122	166,300
Corporate debt securities | Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities	$ 0	$ 0

XML

Marketable Securities (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 127,113,000	$ 200,966,000
Gross Unrealized Gains	5,000	56,000
Gross Unrealized Losses	(85,000)	(138,000)
Fair Value	127,033,000	200,884,000
Other-than-temporary unrealized losses	0	0
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,802,000	4,826,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(20,000)	(1,000)
Fair Value	13,782,000	4,825,000
Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,159,000	29,764,000
Gross Unrealized Gains	0	5,000
Gross Unrealized Losses	(30,000)	(10,000)
Fair Value	26,129,000	29,759,000
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	87,152,000	166,376,000
Gross Unrealized Gains	5,000	51,000
Gross Unrealized Losses	(35,000)	(127,000)
Fair Value	$ 87,122,000	$ 166,300,000

XML

Lease Exit Liability - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jun. 30, 2017	May 10, 2016
Restructuring Cost and Reserve [Line Items]
Future sublease payments to be received		$ 0.5
Reduction in research and development expense	$ 1.3
Raven Biotechnologies Inc
Restructuring Cost and Reserve [Line Items]
Future sublease payments to be received			$ 1.3

XML

Lease Exit Liability - Changes in Lease Exit Liability (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Restructuring Reserve [Roll Forward]
Accrual beginning balance	$ 1,891
Principal payments	(771)
Accrual ending balance	$ 1,120

XML

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended
	May 03, 2017	Apr. 26, 2017	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock, net of offering costs				$ 33,175	$ 0
Registered Direct Offering
Subsidiary, Sale of Stock [Line Items]
Shares of common stock purchased (in shares)		1,100,000
Common stock purchase price (in dollars per share)		$ 21.50
Proceeds from issuance of common stock, net of offering costs		$ 23,700
At the Market Offering
Subsidiary, Sale of Stock [Line Items]
Shares of common stock purchased (in shares)			536,942
Common stock maximum amount available for issuance	$ 75,000
Proceeds of stock sale			$ 9,700

XML

Collaboration and Other Agreements - Janssen Biotech, Inc. (Details) - Janssen Biotech, Inc. - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jan. 31, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Janssen MGD011 Agreement
Collaboration and Other Agreements [Line Items]
Sale of common stock (in shares)		1,923,077
Proceeds of stock sale		$ 75,000,000
Non-refundable upfront payment		$ 50,000,000
Revenue recognized under agreement			$ 0	$ 0	$ 0	$ 0
Sale of common stock (in dollars per share)		$ 39.00
Premium received on stock purchase		$ 12,300,000
Total consideration		125,000,000
Amount allocated to equity		62,700,000
Amount allocated to license and R&D		$ 62,300,000
Janssen MGD011 Agreement | Maximum
Collaboration and Other Agreements [Line Items]
Potential clinical milestone payments			205,000,000.0		205,000,000.0
Potential regulatory milestone payments under agreement			220,000,000.0		220,000,000.0
Potential sales milestone payments under agreement			150,000,000.0		150,000,000.0
Janssen MGD015 Agreement
Collaboration and Other Agreements [Line Items]
Non-refundable upfront payment	$ 75,000,000
Revenue recognized under agreement			200,000	$ 0	300,000	$ 0
Janssen MGD015 Agreement | Maximum
Collaboration and Other Agreements [Line Items]
Potential clinical milestone payments			100,000,000.0		100,000,000.0
Potential regulatory milestone payments under agreement			265,000,000.0		265,000,000.0
Potential sales milestone payments under agreement			$ 300,000,000.0		$ 300,000,000.0

XML

Collaboration and Other Agreements - Les Laboratoires Servier (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2012	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2014	Dec. 31, 2016
Collaboration And Other Agreements [Line Items]
Deferred revenue included in current liabilities		$ 3,202,000		$ 3,202,000			$ 4,261,000
Deferred revenue included in long-term liabilities		9,238,000		$ 9,238,000			10,045,000
Servier | Servier DART
Collaboration And Other Agreements [Line Items]
Non-refundable upfront payment	$ 20,000,000
Original period of development				29 months
Expected period of development				75 months
Change in accounting estimate current year impact				$ 800,000		$ 3,700,000
Option exercise fee						$ 15,000,000
Original Option Exercise Fee Recognition Period						82 months
Option exercise fee recognition period				124 months
Offset to research and development costs under the collaboration agreement		400,000	$ 700,000	$ 900,000	$ 1,100,000
Revenue recognized under agreement		600,000	$ 800,000	1,400,000	$ 1,700,000
Deferred revenue		9,700,000		9,700,000			11,100,000
Deferred revenue included in current liabilities		2,300,000		2,300,000			3,300,000
Deferred revenue included in long-term liabilities		7,400,000		7,400,000			$ 7,800,000
Servier | Servier DART | Maximum
Collaboration And Other Agreements [Line Items]
Potential license fee		40,000,000		40,000,000
Potential clinical milestone payments		63,000,000		63,000,000
Potential regulatory milestone payments under agreement		188,000,000		188,000,000
Potential sales milestone payments under agreement		$ 420,000,000		$ 420,000,000

XML

Collaboration and Other Agreements - NIAID Contract (Details) - NIAID	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Molecule	Jun. 30, 2016 USD ($)
Collaboration And Other Agreements [Line Items]
Commercialization of molecules | Molecule			2
Base period	$ 7,500,000		$ 7,500,000
Revenue recognized under agreement	400,000	$ 2,100,000	1,000,000	$ 3,100,000
Maximum
Collaboration And Other Agreements [Line Items]
Additional development funding options under agreement	17,000,000.0		17,000,000.0
Total potential value	$ 24,500,000.0		$ 24,500,000.0

XML

Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	May 18, 2017	Dec. 31, 2016	Dec. 31, 2012	Feb. 28, 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from issuance of common stock				$ 33,175	$ 0
Options outstanding (in shares)		4,621,008		4,621,008			3,838,060
Weighted-average exercise price of stock options outstanding (in dollars per share)		$ 19.63		$ 19.63			$ 18.93
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense		$ 3,602	$ 3,123	$ 7,063	6,124
2016 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, number of shares authorized (in shares)						800,000
Payroll deduction discount	10.00%
Purchase price of common stock percent of the fair market value	85.00%
Common stock purchased (in shares)		19,351		19,351
Proceeds from issuance of common stock		$ 300		$ 300
2003 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, number of shares authorized (in shares)								4,336,730	2,051,644
Options outstanding (in shares)		1,053,487		1,053,487
Weighted-average exercise price of stock options outstanding (in dollars per share)		$ 1.85		$ 1.85
Stock Incentive Plan 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, number of shares authorized (in shares)		6,769,888		6,769,888
Potential annual increase in shares reserved for future issuance (in shares)		1,960,168		1,960,168
Potential annual increase in shares reserved for future issuance as percentage of outstanding share				4.00%
Options outstanding (in shares)		3,567,521		3,567,521
Weighted-average exercise price of stock options outstanding (in dollars per share)		$ 24.88		$ 24.88
Research and Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense		$ 1,833	1,445	$ 3,506	2,841
General and Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense		$ 1,769	$ 1,678	$ 3,557	$ 3,283

XML

Stock-Based Compensation - Option Pricing Assumptions (Details)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%
Expected term	6 years 3 months	6 years 3 months
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	66.70%	63.70%
Risk-free interest rate	2.00%	1.30%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	67.70%	65.40%
Risk-free interest rate	2.30%	2.10%

XML

Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding, Beginning Balance (in shares)	3,838,060
Shares, Granted (in shares)	1,120,950
Shares, Exercised (in shares)	(155,484)
Shares, Forfeited or expired (in shares)	(182,518)
Shares, Outstanding, Ending Balance (in shares)	4,621,008	3,838,060
Shares, Exercisable (in shares)	2,534,628
Shares, Vested and expected to vest (in shares)	4,407,535
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share)	$ 18.93
Weighted- Average Exercise Price, Granted (in dollars per share)	20.38
Weighted- Average Exercise Price, Exercised (in dollars per share)	2.36
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share)	24.13
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share)	19.63	$ 18.93
Weighted- Average Exercise Price, Exercisable (in dollars per share)	15.86
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share)	$ 19.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term, Outstanding	7 years 2 months 19 days	7 years
Weighted- Average Remaining Contractual Term, Exercisable	5 years 9 months 29 days
Weighted- Average Remaining Contractual Term, Vested and expected to vest	7 years 1 month 24 days
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 17,581
Aggregate Intrinsic Value, Exercisable	16,784
Aggregate Intrinsic Value, Vested and expected to vest	$ 17,489
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 12.73
Intrinsic value of options exercised	$ 2,600
Cash received for options exercised	300
Fair value of shares vested	6,100
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates	$ 26,500
Unrecognized compensation expense recognition period	2 years 7 months 6 days

XML

Commitments and Contingencies (Details) $ in Thousands	1 Months Ended		3 Months Ended	6 Months Ended
	Apr. 30, 2017	Jul. 31, 2015 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) Lease
Commitments and Contingencies Disclosure [Abstract]
Number of Lease | Lease				5
Lease renewal term			5 years
Term of operating leases	72 months	7 years
Lease incentives		$ 5,100
Future sublease payments to be received			$ 500	$ 500
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017			6,391	6,391
2018			5,346	5,346
2019			5,077	5,077
2020			3,454	3,454
2021			3,926	3,926
Thereafter			5,129	5,129
Total			$ 29,323	$ 29,323

XML

Net Income (Loss) Per Share - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2016
Earnings Per Share [Abstract]
Stock options excluded from computation of earnings per share (in shares)	4,621,008	257,678	114,148

XML

Net Income (Loss) Per Share - Basic and Diluted Income (Loss) Per Common Share Computation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income (loss) used for calculation of basic and diluted EPS	$ (40,654)	$ 40,464	$ (78,310)	$ 10,101
Denominator:
Weighted average shares outstanding, basic (in shares)	35,784,804	34,616,197	35,373,799	34,560,021
Effect of dilutive securities:
Stock options and restricted stock units (in shares)	0	1,401,214	0	1,406,966
Weighted average shares outstanding, diluted	35,784,804	36,017,411	35,373,799	35,966,987
Basic net income (loss) per common share (in usd per share)	$ (1.14)	$ 1.17	$ (2.21)	$ 0.29
Diluted net income (loss) per common share (in usd per share)	$ (1.14)	$ 1.12	$ (2.21)	$ 0.28

XML

Subsequent Event (Details) - USD ($) $ in Millions			1 Months Ended
	Jul. 21, 2017	Jul. 06, 2017	Apr. 30, 2017	Jul. 31, 2015	Jun. 30, 2017
Subsequent Event [Line Items]
Future sublease payments to be received					$ 0.5
Term of operating leases			72 months	7 years
Lease incentives				$ 5.1
Subsequent Event
Subsequent Event [Line Items]
Future sublease payments to be received		$ 2.4
Term of operating leases		30 months
Lease incentives	$ 7.5
Increase in future lease payments	$ 23.5