Income Taxes Tax Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal income tax rate	34.00%	34.00%	34.00%
Tax benefit computed at statutory rates	$ (1,966)	$ (3,174)	$ (9,046)
State taxes, net of federal benefit	(334)	(256)	(2,030)
Federal and state tax credits	(1,017)	(2,854)	(454)
Non-deductible expenses	312	1,192	133
Tax exempt income	0	(31)	(56)
Unrecognized tax benefits	64	(193)	83
Stock-based compensation	77	(44)	(2)
Meals and entertainment	94	79	71
Foreign tax rate differences	(53)	(66)	(77)
Change in valuation allowance	2,412	3,062	10,104
Adjustment to deferred income tax rate	11	63	58
Other	(24)	39	236
Income tax expense (benefit)	$ (424)us-gaap_IncomeTaxExpenseBenefit	$ (2,183)us-gaap_IncomeTaxExpenseBenefit	$ (980)us-gaap_IncomeTaxExpenseBenefit

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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