Income Taxes - Reconciliation and Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of income tax (benefit) provision to taxes computed at U.S. federal statutory rates
Provision (benefit) for income taxes at statutory rates	$ (1,422)	$ 90	$ (1,095)
State income taxes net of federal benefit	(559)	(177)	(198)
Tax credits	(141)	(663)	(658)
Compensation charges	34	313	151
Change in valuation allowance	2,169	523	1,913
Other	93	29	47
Provision for income taxes	174	115	$ 160
Deferred tax assets:
Net operating losses	3,980	2,186
Capitalized R&D	1,808	2,282
Credit carry forwards	4,530	4,088
Deferred compensation and payroll	2,902	2,475
Bad debt allowance and other reserves	1,299	930
Acquired intangibles	129	0
Property and equipment	297	354
Other, net	171	765
Total deferred tax assets	15,116	13,080
Valuation allowance	(14,552)	(12,349)
Total deferred tax assets, net of valuation allowance	564	731
Deferred tax liabilities:
Acquired intangibles	0	(297)
Goodwill	(901)	(672)
Total deferred tax liabilities	(901)	(969)
Net deferred tax liabilities	$ (337)	$ (238)