Stockholders' Equity - Warrants to Purchase Common Stock (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stockholders' Equity
Outstanding and exercisable at the beginning	39		39
Exercised	0	0	0	0
Issued	0	0	0	0
Outstanding and exercisable at the end	39		39
Weighted-Average Outstanding, beginning	$ 6.80		$ 6.80
Weighted-Average Outstanding, end	$ 6.80		$ 6.80