Risks and Uncertainties (Details) - USD ($) $ in Thousands	6 Months Ended	7 Months Ended	8 Months Ended
Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Cash and cash equivalents	$ 34,234	$ 34,234	$ 34,234	$ 31,807
Accumulated deficit	$ 213,296	$ 213,296	213,296	$ 186,257
At-the-Market Offering
Concentration Risk [Line Items]
Number of shares issued in transaction (in shares)	3,977,053	4,907,986
Consideration received on sale of stock	$ 18,505	$ 24,560
Payments for stock issuance costs	$ 933		$ 1,406
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%

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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