Stockholders' Equity - Equity Issuances (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2022	Jun. 04, 2021
Lincoln Park Agreement
Class of Stock [Line Items]
Aggregate offering amount authorized per agreement	$ 26.0
Commitment shares issued as consideration per agreement (in shares)	181,510
Number of shares sold (in shares)	250,000
Price of shares sold (in dollars per share)	$ 4.00
Gross price for stock transaction	$ 1.0
Term of agreement (in months)	36 months
Number of shares allowable to direct for Regular Purchase (in shares)	100,000
Maximum obligation per directed purchase transaction for Regular Purchase	$ 2.5
Maximum shares allowed in Accelerated Purchase as percent of shares In Regular Purchase (percent)	300.00%
Maximum shares allowed in Accelerated Purchase as percent of shares traded during specified period (percent)	30.00%
Maximum beneficial ownership allowable per agreement (percent)	9.99%
ATM Agreement
Class of Stock [Line Items]
Aggregate offering amount authorized per agreement			$ 50.0
Stock issued (shares)		0