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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2017
Fair Value Measurements [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | Assets and Liabilities at Fair Value as of March 31, 2017
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in thousands)
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 2,455 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,455 |
Short-term investments |  | 191,248 |  |  | 66,040 |  |  | — |  |  | 257,288 |
Total cash and cash equivalents and investments |  | $ | 193,703 |  |  | $ | 66,040 |  |  | $ | — |  |  | $ | 259,743 |
|  | Assets and Liabilities at Fair Value as of December 31, 2016
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in thousands)
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 45,093 |  |  | $ | 1,507 |  |  | $ | — |  |  | $ | 46,600 |
Short-term investments |  | 227,805 |  |  | 72,099 |  |  | — |  |  | 299,904 |
Total cash and cash equivalents and investments |  | $ | 272,898 |  |  | $ | 73,606 |  |  | $ | — |  |  | $ | 346,504 |
Liabilities |  |  |  |  |  |  |  |
Accrued liabilities |  | $ | — |  |  | $ | — |  |  | $ | 18,912 |  |  | $ | 18,912 |
Total liabilities |  | $ | — |  |  | $ | — |  |  | $ | 18,912 |  |  | $ | 18,912 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
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 March 31, 2017 |  | $ | — |
Balance at December 31, 2015 |  | $ | 22,815 |
Change in valuation of purchase consideration payable to former Symphony Icon stockholders |  | 965 |
Balance at March 31, 2016 |  | $ | 23,780 |

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- Definition Fair Value Measurements [Abstract] + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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