Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 6,419	$ 12,926
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	2,800	2,411
Loss on disposal and impairment of property and equipment, net	242	34
Loss on disposal and abandonment of intangible assets	18	0
Stock-based compensation	7,905	4,093
Deferred income taxes	577	1,514
Unrecognized tax benefits	307	104
Other noncash, net	896	22
Change in assets and liabilities:
Accounts and notes receivable and contract assets	(21,994)	(17,060)
Inventory	(3,936)	2,408
Prepaid expenses and other assets	(3,152)	(1,702)
Accounts payable, accrued and other liabilities	(7,284)	6,740
Deferred revenue	3,232	6,554
Net cash provided by (used in) operating activities	(13,970)	18,044
Cash flows from investing activities:
Purchases of investments	(105,322)	(802)
Proceeds from maturity/call of investments	0	3,167
Purchases of property and equipment	(5,271)	(1,063)
Purchases of intangible assets	(162)	(34)
Net cash provided by (used in) investing activities	(110,755)	1,268
Cash flows from financing activities:
Proceeds from options exercised	100	356
Income and payroll tax payments for net-settled stock awards	(1,259)	(3,777)
Net cash used in financing activities	(1,159)	(3,421)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	67	469
Net increase (decrease) in cash, cash equivalents and restricted cash	(125,817)	16,360
Cash, cash equivalents and restricted cash, beginning of period	351,027	78,438
Cash, cash equivalents and restricted cash, end of period	225,210	94,798
Supplemental disclosures:
Cash and cash equivalents	223,642	92,330
Total cash, cash equivalents and restricted cash shown in the statements of cash flows	351,027	78,438
Cash paid for income taxes, net of refunds	758	63
Non-cash transactions
Property and equipment purchases in accounts payable and accrued liabilities	$ 328	$ 136

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No definition available.

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Name:	us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromStockOptionsExercised
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration