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Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets:    
Total available for sale investments $ 129,470  
Liabilities:    
Derivative financial instruments - warrants 17 $ 285
Certificate of deposit    
Assets:    
Total available for sale investments 1,740  
Corporate debt securities    
Assets:    
Total available for sale investments 87,678  
Commercial paper    
Assets:    
Total available for sale investments 12,782  
Non U.S. government    
Assets:    
Total available for sale investments 737  
U.S. treasury securities    
Assets:    
Total available for sale investments 26,533  
Recurring basis    
Assets:    
Total included in cash and cash equivalents 9,596  
Total available for sale investments 129,470  
Total assets measured at fair value on a recurring basis 139,066 129,988
Liabilities:    
Derivative financial instruments - warrants 17 285
Total liabilities measured at fair value on a recurring basis 17 285
Recurring basis | Certificate of deposit    
Assets:    
Total available for sale investments 1,740  
Recurring basis | Corporate debt securities    
Assets:    
Total available for sale investments 87,678  
Recurring basis | Commercial paper    
Assets:    
Total available for sale investments 12,782  
Recurring basis | Non U.S. government    
Assets:    
Total available for sale investments 737  
Recurring basis | U.S. treasury securities    
Assets:    
Total available for sale investments 26,533  
Recurring basis | Money Market Funds    
Assets:    
Total included in cash and cash equivalents 9,596 129,988
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)    
Assets:    
Total included in cash and cash equivalents 9,596  
Total available for sale investments 0  
Total assets measured at fair value on a recurring basis 9,596 129,988
Liabilities:    
Derivative financial instruments - warrants 0 0
Total liabilities measured at fair value on a recurring basis 0 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 0  
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Money Market Funds    
Assets:    
Total included in cash and cash equivalents 9,596 129,988
Recurring basis | Significant Other Observable Inputs (Level 2)    
Assets:    
Total included in cash and cash equivalents 0  
Total available for sale investments 129,470  
Total assets measured at fair value on a recurring basis 129,470 0
Liabilities:    
Derivative financial instruments - warrants 0 0
Total liabilities measured at fair value on a recurring basis 0 0
Recurring basis | Significant Other Observable Inputs (Level 2) | Certificate of deposit    
Assets:    
Total available for sale investments 1,740  
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities    
Assets:    
Total available for sale investments 87,678  
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper    
Assets:    
Total available for sale investments 12,782  
Recurring basis | Significant Other Observable Inputs (Level 2) | Non U.S. government    
Assets:    
Total available for sale investments 737  
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. treasury securities    
Assets:    
Total available for sale investments 26,533  
Recurring basis | Significant Other Observable Inputs (Level 2) | Money Market Funds    
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 17 285
Total liabilities measured at fair value on a recurring basis 17 285
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 Funds    
Assets:    
Total included in cash and cash equivalents $ 0 $ 0