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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Financial Instruments Owned At Fair Value [Abstract] |
Summary of Cash Equivalents and Short and Long-term Investments | Cash equivalents and short- and long-term investments consisted of the following (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | Amortized |  |  | Unrealized |  |  | Fair |  |  | Amortized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains (Losses) |  |  | Value |  |  | Cost |  |  | Gains (Losses) |  |  | Value |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 109,265 |  |  | $ | — |  |  | $ | 109,265 |  |  | $ | 104,544 |  |  | $ | — |  |  | $ | 104,544 |
Certificate of deposit |  |  | 7,000 |  |  |  | — |  |  |  | 7,000 |  |  |  | 7,814 |  |  |  | — |  |  |  | 7,814 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 15,194 |  |  |  | 40 |  |  |  | 15,234 |  |  |  | 17,758 |  |  |  | (57 | ) |  |  | 17,701 |
Commercial paper |  |  | 9,889 |  |  |  | 76 |  |  |  | 9,965 |  |  |  | 7,456 |  |  |  | 20 |  |  |  | 7,476 |
U.S. treasury securities |  |  | 12,300 |  |  |  | 38 |  |  |  | 12,338 |  |  |  | 12,381 |  |  |  | 26 |  |  |  | 12,407 |
|  | $ | 153,648 |  |  | $ | 154 |  |  | $ | 153,802 |  |  | $ | 149,953 |  |  | $ | (11 | ) |  | $ | 149,942 |
Due within one year |  |  |  |  |  |  |  |  |  | $ | 153,802 |  |  |  |  |  |  |  |  |  |  | $ | 144,736 |
Due within two years |  |  |  |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  | 5,206 |
Total |  |  |  |  |  |  |  |  |  | $ | 153,802 |  |  |  |  |  |  |  |  |  |  | $ | 149,942 |
Summary of Financial Assets Measured at Fair Value on a Recurring Basis | The following table presents information about our financial assets that are measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value (in thousands):
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets at December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 109,265 |  |  | $ | — |  |  | $ | — |  |  | $ | 109,265 |
Certificate of deposit |  |  | 7,000 |  |  |  | — |  |  |  | — |  |  |  | 7,000 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | — |  |  |  | 15,234 |  |  |  | — |  |  |  | 15,234 |
Commercial paper |  |  | — |  |  |  | 9,965 |  |  |  | — |  |  |  | 9,965 |
U.S. treasury securities |  |  | — |  |  |  | 12,338 |  |  |  | — |  |  |  | 12,338 |
|  | $ | 116,265 |  |  | $ | 37,537 |  |  | $ | — |  |  | $ | 153,802 |
Liabilities at December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out liability |  | $ | — |  |  | $ | — |  |  | $ | 1,368 |  |  | $ | 1,368 |
|  | $ | — |  |  | $ | — |  |  | $ | 1,368 |  |  | $ | 1,368 |
Assets at December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 104,544 |  |  | $ | — |  |  | $ | — |  |  | $ | 104,544 |
Certificate of deposit |  |  | 7,814 |  |  |  | — |  |  |  | — |  |  |  | 7,814 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | — |  |  |  | 17,701 |  |  |  | — |  |  |  | 17,701 |
Commercial paper |  |  | — |  |  |  | 7,476 |  |  |  | — |  |  |  | 7,476 |
U.S. treasury securities |  |  | — |  |  |  | 12,407 |  |  |  | — |  |  |  | 12,407 |
|  | $ | 112,358 |  |  | $ | 37,584 |  |  | $ | — |  |  | $ | 149,942 |

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- Definition Tabular disclosure of the components of cash equivalents and other investments. Other investments may include, but are not limited to, current and noncurrent certificates of deposit and current and noncurrent debt and equity marketable securities. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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