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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets:    
Money market funds, included in cash and cash equivalents $ 16,498 $ 5,062
Fixed income mutual funds, included in short-term investments 96,397 11,689
Total 112,895 16,751
Liabilities:    
Redeemable convertible preferred stock warrant liability   369
Total 0 369
Fair Value, Inputs, Level 1    
Assets:    
Money market funds, included in cash and cash equivalents 16,498 5,062
Fixed income mutual funds, included in short-term investments 96,397 11,689
Total 112,895 16,751
Liabilities:    
Redeemable convertible preferred stock warrant liability   0
Total   0
Fair Value, Inputs, Level 2    
Assets:    
Money market funds, included in cash and cash equivalents 0 0
Fixed income mutual funds, included in short-term investments 0 0
Total 0 0
Liabilities:    
Redeemable convertible preferred stock warrant liability   0
Total   0
Fair Value, Inputs, Level 3    
Assets:    
Money market funds, included in cash and cash equivalents 0 0
Fixed income mutual funds, included in short-term investments 0 0
Total $ 0 0
Liabilities:    
Redeemable convertible preferred stock warrant liability   369
Total   $ 369