Stockholders' Equity - December 2021 Private Placement (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		12 Months Ended
	Dec. 16, 2021	Dec. 31, 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
December 2021 Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of common stock (in shares)		1,193,185
Sale of common stock (USD per share)		$ 3.52		$ 3.52
Securities called by warrants (in shares)		1,363,641		1,363,641
Exercise price of warrants (in dollars per share)		$ 3.30		$ 3.30
Amount paid for placement agent commissions		$ 360
Amount paid related to expenses for registered direct offering and concurrent private placement		42
Amount paid for clearing fees		97
Offering costs paid on the issuance of common stock and warrants		499
Net proceeds from sale of common stock and warrants		$ 4,000
Number of warrants issued (in shares)				1,363,641
Estimated proceeds from issuance of warrants				$ 4,500
December 2021 Private Placement | Pre-Funded Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Securities called by warrants (in shares)		85,228		85,228
Exercise price of warrants (in dollars per share)		$ 0.0001		$ 0.0001
Number of warrants issued (in shares)	85,228			85,228
December 2021 Private Placement | Common Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Securities called by warrants (in shares)		1,278,413		1,278,413
Exercise price of warrants (in dollars per share)		$ 3.5200		$ 3.5200
Number of warrants issued (in shares)				1,278,413