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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 |

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