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Oxford Term Loans - Narrative (Details) | Mar. 15, 2019 USD ($) advance | Dec. 31, 2019
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Term Loan Facility |  |
Debt Instrument [Line Items] |  |
Interest rate on debt |  | 11.60%
Percentage of final payment of full principal amount | 5.50% |
Prepayment fee percentage, next twelve months | 3.00% |
Prepayment fee percentage, year two | 2.00% |
Prepayment fee percentage, thereafter | 1.00% |
Debt discount | $ 1,094,000 |
Debt issuance costs | $ 2,205,000 |
Term Loan Facility | Applicable Rate |  |
Debt Instrument [Line Items] |  |
Default interest rate | 5.00% |
Secured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 100,000 |
Number of advances | advance | 2 |
Interest rate on debt | 9.50% |
Period of interest only payments | 36 months |
Amortization period | 23 months |
Additional period of agreement of interest payment | 12 months |
Aggregate period | 48 months |
Additional amortization period | 11 months |
Secured Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 7.00% |
Secured Debt | First tranche |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 75,000 |
Secured Debt | Second tranche |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 25,000 |
Period to achieve net sales milestone before second drawn | 6 months |
Final payment amortized into interest expense over the life of the term loan | $ 4,125,000 |

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