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Fair Value Measurements and Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Summary of Cash Equivalents and Marketable Securities | The following tables summarize the Company’s cash equivalents and marketable securities as of September 30, 2019 and December 31, 2018:
|  | September 30, 2019 |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |
|  |  |  |  |  | Prices in |  |  | Other |  |  | Significant |
|  |  |  |  |  | Active |  |  | Observable |  |  | Unobservable |
|  |  |  |  |  | Markets |  |  | Inputs |  |  | Inputs |
|  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
|  | (in thousands) |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 33,344 |  |  | $ | 33,344 |  |  | $ | — |  |  | $ | — |
Commercial paper |  |  | 700 |  |  |  | — |  |  |  | 700 |  |  |  | — |
Total cash equivalents |  |  | 34,044 |  |  |  | 33,344 |  |  |  | 700 |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 13,479 |  |  |  | — |  |  |  | 13,479 |  |  |  | — |
Corporate bonds |  |  | 13,169 |  |  |  | — |  |  |  | 13,169 |  |  |  | — |
U.S. Government securities |  |  | 12,021 |  |  |  | — |  |  |  | 12,021 |  |  |  | — |
Total marketable securities |  |  | 38,669 |  |  |  | — |  |  |  | 38,669 |  |  |  | — |
Total cash equivalents and marketable securities |  | $ | 72,713 |  |  | $ | 33,344 |  |  | $ | 39,369 |  |  | $ | — |
|  | December 31, 2018 |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |  |
|  |  |  |  |  | Prices in |  |  | Other |  |  | Significant |
|  |  |  |  |  | Active |  |  | Observable |  |  | Unobservable |
|  |  |  |  |  | Markets |  |  | Inputs |  |  | Inputs |
|  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
| (in thousands) |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 40,231 |  |  | $ | 40,231 |  |  | $ | — |  |  | $ | — |
Commercial paper |  |  | 4,979 |  |  |  | — |  |  |  | 4,979 |  |  |  | — |
Total cash equivalents |  |  | 45,210 |  |  |  | 40,231 |  |  |  | 4,979 |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 38,911 |  |  |  | — |  |  |  | 38,911 |  |  |  | — |
Corporate bonds |  |  | 25,830 |  |  |  | — |  |  |  | 25,830 |  |  |  | — |
U.S. Government securities |  |  | 3,994 |  |  |  | — |  |  |  | 3,994 |  |  |  | — |
Total marketable securities |  |  | 68,735 |  |  |  | — |  |  |  | 68,735 |  |  |  | — |
Total cash equivalents and marketable securities |  | $ | 113,945 |  |  | $ | 40,231 |  |  | $ | 73,714 |  |  | $ | — |
Summary of Marketable Securities | The following tables summarize the Company’s marketable securities as of September 30, 2019 and December 31, 2018:
|  | September 30, 2019 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (in thousands) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper (due within 1 year) |  | $ | 13,479 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,479 |
Corporate bonds (due within 1 year) |  |  | 13,137 |  |  |  | 32 |  |  |  | — |  |  |  | 13,169 |
U.S. Government securities (due within 1 year) |  |  | 12,011 |  |  |  | 10 |  |  |  | — |  |  |  | 12,021 |
|  | $ | 38,627 |  |  | $ | 42 |  |  | $ | — |  |  | $ | 38,669 |
|  | December 31, 2018 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (in thousands) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper (due within 1 year) |  | $ | 38,921 |  |  | $ | — |  |  | $ | (10 | ) |  | $ | 38,911 |
Corporate bonds (due within 1 year) |  |  | 25,851 |  |  |  | 3 |  |  |  | (24 | ) |  |  | 25,830 |
U.S. Government securities (due within 1 year) |  |  | 3,995 |  |  |  | — |  |  |  | (1 | ) |  |  | 3,994 |
|  | $ | 68,767 |  |  | $ | 3 |  |  | $ | (35 | ) |  | $ | 68,735 |

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