The maximum amount of option available to lender or its nominees to purchase company's equity securities, or instruments exercisable for or convertible into equity securities, sold to investors in any private financing upon the same terms and conditions.

No definition available.

Debt - Summary (Details) - USD ($)			1 Months Ended	3 Months Ended	12 Months Ended
Debt - Summary (Details) - USD ($)	Jun. 02, 2021	Mar. 11, 2020	Feb. 29, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018
Debt
Loss on extinguishment of debt						$ (2,757,000)
Term loan
Debt
End of term fee					$ 5,000,000	$ 5,000,000
Loan Agreement \| Term loan
Debt
Maximum borrowing capacity							$ 75,000,000.0
Principal amount of advances outstanding		$ 35,000,000.0
Interest rate (as a percent)					9.80%
Fee due at maturity, as a percentage of aggregate advances					6.95%
The amount in excess of which prepayments may be made					$ 5,000,000.0
Repayment of debt		$ 30,000,000.0			30,000,000.0
Minimum cash and cash equivalents in accounts to be maintained	$ 3,000,000.0
Net product revenue	$ 15,000,000.0
Trailing period	3 months		6 months
Percent of net product revenue sales target		70.00%	80.00%
Minimum liquidity requirement			$ 40,000,000.0
Minimum amount to be maintained in cash and cash equivalents		$ 3,000,000.0
Maximum value of lender option to purchase equity securities					2,000,000.0
End of term loan charge payment		2,100,000
End of term loan charge		$ 300,000	$ 600,000
Loan origination costs					1,300,000
Initial fee paid to lender					700,000
Loss on extinguishment of debt				$ 2,700,000
End of term fee					$ 5,000,000.0
Loan Agreement \| Term loan \| Prime rate
Debt
Variable rate basis					interest minus 5.50%
Variable interest rate margin (as a percent)					9.80%
Variable rate adjustment (as a percent)					5.50%
Loan Agreement \| Term loan \| Initial Advance
Debt
Principal amount of advances outstanding							25,000,000.0
Loan Agreement \| Term loan \| Tranche 7 Advance
Debt
Maximum borrowing capacity							$ 5,000,000.0
Additional tranches					$ 5,000,000.0
Loan Agreement \| Term loan \| Prepayment during the first 12 months following initial closing
Debt
Prepayment penalty as a percentage of the amount being repaid					3.00%
Loan Agreement \| Term loan \| Prepayment after the first 12 months following initial closing but before 24 months
Debt
Prepayment penalty as a percentage of the amount being repaid					2.00%
Loan Agreement \| Term loan \| Prepayment after the first 24 months following initial closing but before maturity
Debt
Prepayment penalty as a percentage of the amount being repaid					1.00%