Stockholders' Equity - Outstanding Warrants from the January 2020 Equity Offering (Details) - $ / shares	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021	Jan. 31, 2020
January 2020 Equity Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants issued (in shares)	229,414	229,414	467,306
Exercise price of warrants (in dollars per share)	$ 3.67	$ 3.67	$ 3.51
Investor Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants issued (in shares)		187,734	425,626
Sale of common stock (USD per share)				$ 5.05
January 2020 Equity Offering, Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants issued (in shares)		41,680	41,680
Exercise price of warrants (in dollars per share)					$ 4.9940