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Oxford Term Loans - Narrative (Details) - USD ($) | Mar. 15, 2019 | Mar. 31, 2019
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Term Loan Facility |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity |  | $ 75,000,000
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 |  | $ 1,100,000
Debt issuance costs |  | $ 2,200,000
Term Loan Facility | Applicable Rate |  |
Debt Instrument [Line Items] |  |
Default interest rate | 5.00% |
Secured Debt |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 100,000,000.0 |
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 | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 7.00% |
Secured Debt | Term Loan Facility, Tranche One |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 75,000,000.0 |
Secured Debt | Term Loan Facility, Tranche Two |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 25,000,000.0 |

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