Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Mar. 31, 2018	21,139,000
Balance at Mar. 31, 2018	$ 211	$ 1,041,113	$ (1,645)	$ 883	$ (988,333)	$ 52,229
Issuance of common stock - ESPP (in shares)	20,000
Issuance of common stock - ESPP		157				157
Issuance of common stock - restricted shares (in shares)	451,000
Issuance of common stock - restricted shares	$ 4	(4)
Stock-based compensation expense		3,030				3,030
Issuance of stock for 401(k) match (in shares)	42,000
Issuance of stock for 401(k) match	$ 1	326				327
Repurchase of treasury stock			(456)			(456)
Cumulative translation adjustment				(888)		(888)
Cumulative impact of adoption of ASU No. 2014-09					33	33
Net (loss) income					26,761	$ 26,761
Balance (in shares) at Mar. 31, 2019	21,652,000					21,413,113
Balance at Mar. 31, 2019	$ 216	1,044,622	(2,101)	(5)	(961,539)	$ 81,193
Issuance of common stock - ESPP (in shares)	37,000
Issuance of common stock - ESPP		201				201
Issuance of common stock - restricted shares (in shares)	360,000
Issuance of common stock - restricted shares	$ 4	(4)
Stock-based compensation expense		1,922				1,922
Issuance of stock for 401(k) match (in shares)	44,000
Issuance of stock for 401(k) match	$ 1	341				342
Repurchase of treasury stock			(565)			(565)
Cumulative translation adjustment				(211)		(211)
Net (loss) income					(17,096)	(17,096)
Issuance of common stock-warrant exercise (in shares)	809,000
Issuance of common stock-warrant exercise	$ 8	6,425				$ 6,433
Balance (in shares) at Mar. 31, 2020	22,902,000					22,604,410
Balance at Mar. 31, 2020	$ 229	$ 1,053,507	$ (2,666)	$ (216)	$ (978,635)	$ 72,219