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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Measurements [Abstract]

Fair Value, by Balance Sheet Grouping

	Assets and Liabilities at Fair Value
	As of December 31, 2018
	Level 1				Level 2				Level 3				Total
	(in thousands)
Assets
Cash and cash equivalents	$	80,386			$	—			$	—			$	80,386
Short-term investments	73,974				5,692				—				79,666
Total cash and cash equivalents and investments	$	154,360			$	5,692			$	—			$	160,052

	Assets and Liabilities at Fair Value
	As of December 31, 2017
	Level 1				Level 2				Level 3				Total
	(in thousands)
Assets
Cash and cash equivalents	$	61,661			$	—			$	—			$	61,661
Short-term investments	222,148				26,979				—				249,127
Total cash and cash equivalents and investments	$	283,809			$	26,979			$	—			$	310,788

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

	Other Long-term Liabilities
	(in thousands)
Balance at December 31, 2015	22,815
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	(703		)
Payment of contingent payment obligation with cash	(3,200		)
Balance at December 31, 2016	18,912
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	2,101
Payment of contingent payment obligation with common stock and cash	(21,013		)
Balance at December 31, 2017	$	—

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- Definition

Fair Value Measurements [Abstract]

+ References

No definition available.

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- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258

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