Risks and Uncertainties (Details) - USD ($) $ in Thousands		9 Months Ended	10 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	Jul. 15, 2019
Concentration Risk [Line Items]
Cash and cash equivalents	$ 31,164	$ 31,164	$ 31,164	$ 31,807
Accumulated deficit	227,851	$ 227,851	$ 227,851	$ 186,257
At-the-Market Offering
Concentration Risk [Line Items]
Number of shares issued in transaction (in shares)		5,486,871	6,417,804
Consideration received on sale of stock		$ 24,592	$ 30,647
Payments for stock issuance costs		$ 1,068	$ 1,541
Remaining amount available for offering	$ 42,812
Senior Secured Notes Due 2025
Concentration Risk [Line Items]
Interest rate	12.50%	12.50%	12.50%
Senior Secured Notes Due 2025 | Senior Notes
Concentration Risk [Line Items]
Interest rate	12.50%	12.50%	12.50%		12.50%