Quarterly report pursuant to Section 13 or 15(d)

Fair Value Considerations - Schedule of Assets and Liabilities at Fair Value on a Recurring Basis (Details)

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Fair Value Considerations - Schedule of Assets and Liabilities at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Debt derivative liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt derivative liability     $ 2,387
Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets $ 78,305 $ 78,243  
Total liabilities 39,205 39,352  
Recurring | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 27,243 23,044  
Recurring | U.S. government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 12,093 12,123  
Recurring | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets   6,408  
Recurring | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 38,969 36,668  
Recurring | Oberland facility      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Oberland facility 36,686 36,855  
Recurring | Debt derivative liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt derivative liability 2,519 2,497  
Recurring | (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 39,336 35,167  
Total liabilities 0 0  
Recurring | (Level 1) | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 27,243 23,044  
Recurring | (Level 1) | U.S. government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 12,093 12,123  
Recurring | (Level 1) | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets   0  
Recurring | (Level 1) | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 0 0  
Recurring | (Level 1) | Oberland facility      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Oberland facility 0 0  
Recurring | (Level 1) | Debt derivative liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt derivative liability 0 0  
Recurring | (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 38,969 43,076  
Total liabilities 0 0  
Recurring | (Level 2) | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 0 0  
Recurring | (Level 2) | U.S. government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 0 0  
Recurring | (Level 2) | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets   6,408  
Recurring | (Level 2) | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 38,969 36,668  
Recurring | (Level 2) | Oberland facility      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Oberland facility 0 0  
Recurring | (Level 2) | Debt derivative liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt derivative liability 0 0  
Recurring | (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 0 0  
Total liabilities 39,205 39,352  
Recurring | (Level 3) | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 0 0  
Recurring | (Level 3) | U.S. government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 0 0  
Recurring | (Level 3) | Corporate bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets   0  
Recurring | (Level 3) | Commercial paper      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets 0 0  
Recurring | (Level 3) | Oberland facility      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Oberland facility 36,686 36,855  
Recurring | (Level 3) | Debt derivative liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt derivative liability $ 2,519 $ 2,497