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Cash and Investments - Securities Classified as Cash and Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Cash and cash equivalents: |  |
Cash and cash equivalents | $ 72,428 | $ 91,032
Short-term investments: |  |
Short-term investments, Cost | 44,267 | 95,455
Short-term investments, Gross Unrealized Gains | 1 | 7
Short-term investments, Gross Unrealized Losses | (7) | (10)
Short-term investments, Fair Value | 44,261 | 95,452
Long-term investments: |  |
Total cash equivalents and investments, Cost | 116,695 | 188,602
Total cash equivalents and investments, Gross Unrealized Gains | 1 | 7
Total cash equivalents and investments, Gross Unrealized Losses | (7) | (11)
Total cash equivalents and investments, Fair Value | 116,689 | 188,598
Money market funds |  |
Cash and cash equivalents: |  |
Cash and cash equivalents | 71,175 | 88,151
Commercial paper |  |
Cash and cash equivalents: |  |
Cash and cash equivalents |  | 2,100
Cash |  |
Cash and cash equivalents: |  |
Cash and cash equivalents | 1,253 | 781
Commercial paper |  |
Short-term investments: |  |
Short-term investments, Cost | 31,936 | 60,631
Short-term investments, Gross Unrealized Gains | 1 | 2
Short-term investments, Gross Unrealized Losses | (2) | (4)
Short-term investments, Fair Value | 31,935 | 60,629
Corporate bonds |  |
Short-term investments: |  |
Short-term investments, Cost | 7,025 | 24,547
Short-term investments, Gross Unrealized Gains | 0 | 3
Short-term investments, Gross Unrealized Losses | (3) | (6)
Short-term investments, Fair Value | 7,022 | 24,544
Long-term investments: |  |
Long-term investments, Cost |  | 2,115
Long-term investments, Gross Unrealized Gains |  | 0
Long-term investments, Gross Unrealized Losses |  | (1)
Long-term investments, Fair Value |  | 2,114
Asset-backed securities |  |
Short-term investments: |  |
Short-term investments, Cost | 5,306 |
Short-term investments, Gross Unrealized Gains | 0 |
Short-term investments, Gross Unrealized Losses | (2) |
Short-term investments, Fair Value | 5,304 |
U.S. government-sponsored agency bonds |  |
Short-term investments: |  |
Short-term investments, Cost |  | 9,277
Short-term investments, Gross Unrealized Gains |  | 2
Short-term investments, Gross Unrealized Losses |  | 0
Short-term investments, Fair Value |  | 9,279
U.S. treasury notes |  |
Short-term investments: |  |
Short-term investments, Cost | 0 | 1,000
Short-term investments, Gross Unrealized Gains | 0 | 0
Short-term investments, Gross Unrealized Losses | 0 | 0
Short-term investments, Fair Value | $ 0 | $ 1,000

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