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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2020
Fair Value Measurements [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | Assets and Liabilities at Fair Value as of March 31, 2020 |  |  |  |  |  |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in thousands) |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 55,592 |  |  | $ | — |  |  | $ | — |  |  | $ | 55,592 |
Short-term investments |  | 193,545 |  |  | — |  |  | — |  |  | 193,545 |
Total cash and cash equivalents and investments |  | $ | 249,137 |  |  | $ | — |  |  | $ | — |  |  | $ | 249,137 |
|  | Assets and Liabilities at Fair Value as of December 31, 2019 |  |  |  |  |  |
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  | (in thousands) |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 36,112 |  |  | $ | — |  |  | $ | — |  |  | $ | 36,112 |
Short-term investments |  | 235,547 |  |  | — |  |  | — |  |  | 235,547 |
Total cash and cash equivalents and investments |  | $ | 271,659 |  |  | $ | — |  |  | $ | — |  |  | $ | 271,659 |

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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=118260190&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=117815213&loc=d3e19207-110258 + Details
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