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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets:    
Total available for sale investments $ 128,878  
Liabilities:    
Derivative financial instruments—warrants 0 $ 285
Recurring basis    
Assets:    
Total included in cash and cash equivalents 10,990  
Total available for sale investments 128,878  
Total assets measured at fair value on a recurring basis 139,868 129,988
Liabilities:    
Derivative financial instruments—warrants   285
Total liabilities measured at fair value on a recurring basis   285
Recurring basis | Certificate of deposit    
Assets:    
Total available for sale investments 1,260  
Recurring basis | Corporate debt securities    
Assets:    
Total available for sale investments 88,390  
Recurring basis | Commercial paper    
Assets:    
Total available for sale investments 14,454  
Recurring basis | Non U.S. government    
Assets:    
Total available for sale investments 728  
Recurring basis | U.S. treasury securities    
Assets:    
Total available for sale investments 24,046  
Recurring basis | Money market fund    
Assets:    
Total included in cash and cash equivalents 10,990 129,988
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)    
Assets:    
Total included in cash and cash equivalents 10,990  
Total available for sale investments 24,046  
Total assets measured at fair value on a recurring basis 35,036 129,988
Liabilities:    
Derivative financial instruments—warrants   0
Total liabilities measured at fair value on a recurring basis   0
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Certificate of deposit    
Assets:    
Total available for sale investments 0  
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Corporate debt securities    
Assets:    
Total available for sale investments 0  
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Commercial paper    
Assets:    
Total available for sale investments 0  
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Non U.S. government    
Assets:    
Total available for sale investments 0  
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | U.S. treasury securities    
Assets:    
Total available for sale investments 24,046  
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Money market fund    
Assets:    
Total included in cash and cash equivalents 10,990 129,988
Recurring basis | Significant Other Observable Inputs (Level 2)    
Assets:    
Total included in cash and cash equivalents 0  
Total available for sale investments 104,832  
Total assets measured at fair value on a recurring basis 104,832 0
Liabilities:    
Derivative financial instruments—warrants   0
Total liabilities measured at fair value on a recurring basis   0
Recurring basis | Significant Other Observable Inputs (Level 2) | Certificate of deposit    
Assets:    
Total available for sale investments 1,260  
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities    
Assets:    
Total available for sale investments 88,390  
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper    
Assets:    
Total available for sale investments 14,454  
Recurring basis | Significant Other Observable Inputs (Level 2) | Non U.S. government    
Assets:    
Total available for sale investments 728  
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. treasury securities    
Assets:    
Total available for sale investments 0  
Recurring basis | Significant Other Observable Inputs (Level 2) | Money market fund    
Assets:    
Total included in cash and cash equivalents 0 0
Recurring basis | Significant Unobservable Inputs (Level 3)    
Assets:    
Total included in cash and cash equivalents 0  
Total available for sale investments 0  
Total assets measured at fair value on a recurring basis 0 0
Liabilities:    
Derivative financial instruments—warrants   285
Total liabilities measured at fair value on a recurring basis   285
Recurring basis | Significant Unobservable Inputs (Level 3) | Certificate of deposit    
Assets:    
Total available for sale investments 0  
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate debt securities    
Assets:    
Total available for sale investments 0  
Recurring basis | Significant Unobservable Inputs (Level 3) | Commercial paper    
Assets:    
Total available for sale investments 0  
Recurring basis | Significant Unobservable Inputs (Level 3) | Non U.S. government    
Assets:    
Total available for sale investments 0  
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. treasury securities    
Assets:    
Total available for sale investments 0  
Recurring basis | Significant Unobservable Inputs (Level 3) | Money market fund    
Assets:    
Total included in cash and cash equivalents $ 0 $ 0