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Short-Term Investments - Schedule of available for sale short-term investments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Short-term investments |  |
Amortized Cost | $ 177,096 | $ 177,614
Gross Unrealized Loss | (560) | (63)
Total Fair Value | 176,536 | 177,551
U.S. government securities |  |
Short-term investments |  |
Amortized Cost | 177,096 | 177,614
Gross Unrealized Loss | (560) | (63)
Total Fair Value | $ 176,536 | $ 177,551

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