General and Basis of Presentation - Potentially Dilutive Securities (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class of warrant or right, exercise price of warrants or rights (in dollars per share)	$ 1.665	$ 1.665	$ 1.665	$ 1.665
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	1,886	961	1,096	961
Unvested restricted stock and restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	1,030	60	239	60
Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	856	901	857	901