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Fair Value Measurements - Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | $ 37,826 | $ 37,813
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 37,826 | 37,813
Warrant liabilities | 0 | (17,740)
Total warrant liabilities at fair value | 0 | (17,740)
Fair Value, Inputs, Level 1, 2 and 3 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 34,412 | 37,756
Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 15,969 | 5,380
Warrant liabilities | 0 | 0
Total warrant liabilities at fair value | 0 | 0
Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 18,443 | 32,376
Warrant liabilities | 0 | 0
Total warrant liabilities at fair value | 0 | 0
Level 3 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 0 | 0
Warrant liabilities | 0 | (17,740)
Total warrant liabilities at fair value | 0 | (17,740)
Commercial paper | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 16,691 | 11,932
Commercial paper | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 0 | 0
Commercial paper | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 16,691 | 11,932
Commercial paper | Level 3 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 0 | 0
U.S. Treasuries | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 15,969 | 5,380
U.S. Treasuries | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 15,969 | 5,380
U.S. Treasuries | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 0 | 0
U.S. Treasuries | Level 3 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 0 | 0
Corporate bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 1,752 | 20,444
Corporate bonds | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 0 | 0
Corporate bonds | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 1,752 | 20,444
Corporate bonds | Level 3 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | 0 | 0
Money Market Funds | Fair Value Measured at Net Asset Value Per Share | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments at fair value | $ 3,414 | $ 57

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