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Cash, Cash Equivalents and Investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Cash and Cash Equivalents [Abstract] |
Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type | The following tables summarize the Company's cash, cash equivalents, and held-to-maturity investments at December 31, 2019 and December 31, 2018 (in thousands):
| As of December 31, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Short-Term Investments |  | Long-Term Investments
Cash | $ | 103,319 |  |  | $ | — |  |  | $ | — |  |  | $ | 103,319 |  |  | $ | 103,319 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 8,845 |  |  | — |  |  | — |  |  | 8,845 |  |  | 8,845 |  |  | — |  |  | — |
Agency bonds | 32,869 |  |  | 14 |  |  | (4 | ) |  | 32,879 |  |  | — |  |  | 15,131 |  |  | 17,738 |
Subtotal | 41,714 |  |  | 14 |  |  | (4 | ) |  | 41,724 |  |  | 8,845 |  |  | 15,131 |  |  | 17,738 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipal obligations | 25,038 |  |  | 8 |  |  | — |  |  | 25,046 |  |  |  |  |  | 21,560 |  |  | 3,478 |
Certificates of deposit | 1,400 |  |  | — |  |  | — |  |  | 1,400 |  |  | — |  |  | 1,400 |  |  | — |
Corporate bonds | 135,175 |  |  | 71 |  |  | (30 | ) |  | 135,216 |  |  | 886 |  |  | 113,241 |  |  | 21,048 |
U.S. Treasury repurchase agreements | 57,200 |  |  | — |  |  | — |  |  | 57,200 |  |  | 57,200 |  |  | — |  |  | — |
Treasury inflation-protected securities | 3,235 |  |  | 14 |  |  | — |  |  | 3,249 |  |  | — |  |  | — |  |  | 3,235 |
Commercial paper | 29,202 |  |  | — |  |  | — |  |  | 29,202 |  |  | 2,000 |  |  | 27,202 |  |  | — |
Subtotal | 251,250 |  |  | 93 |  |  | (30 | ) |  | 251,313 |  |  | 60,086 |  |  | 163,403 |  |  | 27,761 |
Total | $ | 396,283 |  |  | $ | 107 |  |  | $ | (34 | ) |  | $ | 396,356 |  |  | $ | 172,250 |  |  | $ | 178,534 |  |  | $ | 45,499 |
| As of December 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Short-Term Investments |  | Long-Term Investments
Cash | $ | 144,095 |  |  | $ | — |  |  | $ | — |  |  | $ | 144,095 |  |  | $ | 144,095 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 205,367 |  |  | — |  |  | — |  |  | 205,367 |  |  | 205,367 |  |  | — |  |  | — |
Total | $ | 349,462 |  |  | $ | — |  |  | $ | — |  |  | $ | 349,462 |  |  | $ | 349,462 |  |  | $ | — |  |  | $ | — |

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