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Fair Value Measurements (Tables) | 12 Months Ended
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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 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 + Details
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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 + Details
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