Oxford Term Loans - Narrative (Details) - USD ($)	Mar. 15, 2019	Mar. 31, 2019
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

Debt Instrument, Additional Amortization Period

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Debt Instrument, Additional Period Of Agreement Of Interest Payment

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Debt Instrument, Amortization Period

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Debt Instrument, Default Interest Rate

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- Definition

Debt Instrument, Percentage Of Principal Amount, Balloon Payment

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- Definition

Debt Instrument, Period Of Interest Only Payments

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Debt Instrument, Prepayment Fee Percentage, Next Twelve Months

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Debt Instrument, Prepayment Fee Percentage, Thereafter

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Debt Instrument, Prepayment Fee Percentage, Year Two

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Debt Instrument, Term, Aggregate Period

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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