Stockholders' Equity - June 2021 Equity Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2021	Jan. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount paid for clearing fees		$ 231
Offering costs paid on the issuance of common stock and warrants			$ 969	$ 510
Investor Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of common stock (in shares)	990,100
Sale of common stock (USD per share)	$ 5.05
Amount paid for placement agent commissions	$ 400
Amount paid related to expenses for registered direct offering and concurrent private placement	51
Amount paid for clearing fees	19
Offering costs paid on the issuance of common stock and warrants			$ 470
Net proceeds from sale of common stock and warrants	$ 4,500