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Cash and Investments (Tables) | 12 Months Ended
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Dec. 31, 2021
Cash and Cash Equivalents [Abstract] |
Schedule of Securities Classified as Cash and Investments | Securities classified as cash and investments as of December 31, 2021 and 2020 are summarized below (in thousands). Estimated fair value is based on quoted market prices for these investments.
| December 31, 2021
|  |  | Gross Unrealized |  |
| Amortized Cost |  | Gains |  | Losses |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 71,175 |  |  | $ | — |  |  | $ | — |  |  | $ | 71,175 |
Cash | 1,253 |  |  | — |  |  | — |  |  | 1,253 |
Total cash and cash equivalents | 72,428 |  |  | — |  |  | — |  |  | 72,428 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | $ | 31,936 |  |  | $ | 1 |  |  | $ | (2) |  |  | $ | 31,935 |
Corporate bonds | 7,025 |  |  | — |  |  | (3) |  |  | 7,022 |
Asset-backed securities | 5,306 |  |  | — |  |  | (2) |  |  | 5,304 |
U.S. treasury notes | — |  |  | — |  |  | — |  |  | — |
Total short-term investments | 44,267 |  |  | 1 |  |  | (7) |  |  | 44,261 |
Total cash equivalents and investments | $ | 116,695 |  |  | $ | 1 |  |  | $ | (7) |  |  | $ | 116,689 |
| December 31, 2020
|  |  | Gross Unrealized |  |
| Amortized Cost |  | Gains |  | Losses |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 88,151 |  |  | $ | — |  |  | $ | — |  |  | $ | 88,151 |
Commercial paper | 2,100 |  |  | — |  |  | — |  |  | 2,100 |
Cash | 781 |  |  | — |  |  | — |  |  | 781 |
Total cash and cash equivalents | 91,032 |  |  | — |  |  | — |  |  | 91,032 |
Short-term investments |  |  |  |  |  |  |
Commercial paper | $ | 60,631 |  |  | $ | 2 |  |  | $ | (4) |  |  | $ | 60,629 |
Corporate bonds | 24,547 |  |  | 3 |  |  | (6) |  |  | 24,544 |
U.S. government-sponsored agency bonds | 9,277 |  |  | 2 |  |  | — |  |  | 9,279 |
U.S. treasury notes | 1,000 |  |  | — |  |  | — |  |  | 1,000 |
Total short-term investments | 95,455 |  |  | 7 |  |  | (10) |  |  | 95,452 |
Long-term investments: |  |  |  |  |  |  |
Corporate bonds | $ | 2,115 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 2,114 |
Total cash equivalents and investments | $ | 188,602 |  |  | $ | 7 |  |  | $ | (11) |  |  | $ | 188,598 |
Schedule of Amortized Cost and Estimated Fair Value of Available-for-Sale Debt Securities by Contractual Maturity | As of December 31, 2021, the amortized cost and estimated fair value of available-for-sale debt securities by contractual maturity were as follows (in thousands):
| Amortized Cost |  | Fair Value
Due in one year or less | $ | 44,267 |  |  | $ | 44,261 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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