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Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Total available for sale investments | $ 110,922 |
Liabilities: |  |
Derivative financial instruments - warrants | 78 | $ 285
Certificate of deposit |  |
Assets: |  |
Total available for sale investments | 2,599 |
Corporate debt securities |  |
Assets: |  |
Total available for sale investments | 81,450 |
Commercial paper |  |
Assets: |  |
Total available for sale investments | 5,745 |
Non U.S. government |  |
Assets: |  |
Total available for sale investments | 741 |
U.S. treasury securities |  |
Assets: |  |
Total available for sale investments | 20,387 |
Recurring basis |  |
Assets: |  |
Total included in cash and cash equivalents | 11,616 |
Total available for sale investments | 110,922 |
Total assets measured at fair value on a recurring basis | 122,538 | 129,988
Liabilities: |  |
Derivative financial instruments - warrants | 78 | 285
Total liabilities measured at fair value on a recurring basis | 78 | 285
Recurring basis | Certificate of deposit |  |
Assets: |  |
Total available for sale investments | 2,599 |
Recurring basis | Corporate debt securities |  |
Assets: |  |
Total available for sale investments | 81,450 |
Recurring basis | Commercial paper |  |
Assets: |  |
Total available for sale investments | 5,745 |
Recurring basis | Non U.S. government |  |
Assets: |  |
Total available for sale investments | 741 |
Recurring basis | U.S. treasury securities |  |
Assets: |  |
Total available for sale investments | 20,387 |
Recurring basis | Money Market Funds |  |
Assets: |  |
Total included in cash and cash equivalents | 6,271 | 129,988
Recurring basis | Corporate debt securities |  |
Assets: |  |
Total included in cash and cash equivalents | 5,345 |
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) |  |
Assets: |  |
Total included in cash and cash equivalents | 6,271 |
Total available for sale investments | 0 |
Total assets measured at fair value on a recurring basis | 6,271 | 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 | 6,271 | 129,988
Recurring basis | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Corporate debt securities |  |
Assets: |  |
Total included in cash and cash equivalents | 0 |
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total included in cash and cash equivalents | 5,345 |
Total available for sale investments | 110,922 |
Total assets measured at fair value on a recurring basis | 116,267 | 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 | 2,599 |
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Assets: |  |
Total available for sale investments | 81,450 |
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Assets: |  |
Total available for sale investments | 5,745 |
Recurring basis | Significant Other Observable Inputs (Level 2) | Non U.S. government |  |
Assets: |  |
Total available for sale investments | 741 |
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. treasury securities |  |
Assets: |  |
Total available for sale investments | 20,387 |
Recurring basis | Significant Other Observable Inputs (Level 2) | Money Market Funds |  |
Assets: |  |
Total included in cash and cash equivalents | 0 | 0
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Assets: |  |
Total included in cash and cash equivalents | 5,345 |
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 | 78 | 285
Total liabilities measured at fair value on a recurring basis | 78 | 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
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate debt securities |  |
Assets: |  |
Total included in cash and cash equivalents | $ 0 |

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