Term Note Payable - Thee-Year Term Note - Loss on Extinguishment of Debt (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2020
Loss on extinguishment of debt
Gain (loss) on extinguishment of debt	$ (4,282)	$ (4,282)
Term Note Payable, Amended and Restated Note Purchase Agreement \| Senior Notes
Loss on extinguishment of debt
Gain (loss) on extinguishment of debt	(4,300)	(4,300)
Write-off of unamortized debt issuance costs	1,500	1,500
Write-off of facility fee	1,000	1,000
Write-off of accrued anticipated exit fees	1,000	1,000
Write-off of fair value of common stock warrants issued to the warrant holder in connection with Amendment No. 3 to the Purchase Warrant	$ 800	$ 800