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