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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Measurements [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | Assets and Liabilities at Fair Value as of June 30, 2018
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in thousands)
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 15,044 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,044 |
Short-term investments |  | 174,082 |  |  | 20,563 |  |  | — |  |  | 194,645 |
Total cash and cash equivalents and investments |  | $ | 189,126 |  |  | $ | 20,563 |  |  | $ | — |  |  | $ | 209,689 |
|  | 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 |

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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://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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