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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | We measure cash, cash equivalents and short-term investments at fair value on a recurring basis. The fair values of such assets were as follows (in thousands):
|  |  |  |  |  | Fair Value Measurements at Reporting Date Using |
|  | Balance at June 30, 2019 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash and money market funds |  | $ | 33,070 |  |  | $ | 33,070 |  |  | $ | — |  |  | $ | — |
U.S. treasury bills and government agency obligations |  |  | 99,615 |  |  |  | 99,615 |  |  |  | — |  |  |  | — |
U.S. corporate debt securities |  |  | 33,037 |  |  |  | — |  |  |  | 33,037 |  |  |  | — |
Foreign corporate debt securities |  |  | 17,011 |  |  |  | — |  |  |  | 17,011 |  |  |  | — |
U.S. commercial paper |  |  | 61,954 |  |  |  | — |  |  |  | 61,954 |  |  |  | — |
Foreign commercial paper |  |  | 31,318 |  |  |  | — |  |  |  | 31,318 |  |  |  | — |
Total |  | $ | 276,005 |  |  | $ | 132,685 |  |  | $ | 143,320 |  |  | $ | — |
|  |  |  |  |  | Fair Value Measurements at Reporting Date Using |
|  | Balance at December 31, 2018 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash and money market funds |  | $ | 22,751 |  |  | $ | 22,751 |  |  | $ | — |  |  | $ | — |
U.S. treasury bills and government agency obligations |  |  | 59,741 |  |  |  | 59,741 |  |  |  | — |  |  |  | — |
U.S. corporate debt securities |  |  | 59,087 |  |  |  | — |  |  |  | 59,087 |  |  |  | — |
Foreign corporate debt securities |  |  | 5,046 |  |  |  | — |  |  |  | 5,046 |  |  |  | — |
U.S. commercial paper |  |  | 61,885 |  |  |  | — |  |  |  | 61,885 |  |  |  | — |
Foreign commercial paper |  |  | 123,861 |  |  |  | — |  |  |  | 123,861 |  |  |  | — |
Total |  | $ | 332,371 |  |  | $ | 82,492 |  |  | $ | 249,879 |  |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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