Stockholders' Equity - Common Stock and Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Sep. 04, 2019	Mar. 31, 2021	Mar. 31, 2020
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Registered Direct Offering, common stock, aggregate shares offered, shares (in shares)	580,000
Registered Direct Offering, common stock, aggregate shares offered, share price (in dollars per share)	$ 5.00
Proceeds from issuance of common stock and warrants, Registered Direct Offering	$ 5,100
Proceeds from issuance of common stock and warrants, net of offering costs	$ 4,600	$ 15,905	$ 9,959