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Income taxes (Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015
--- | --- | ---
Current deferred tax assets |  |
Net operating loss carryforwards | $ 2,739 | $ 2,179
Inventory valuation | 14 | 14
Reserves and allowances | 2,740 | 2,394
Net current deferred tax assets | 5,493 | 4,587
Net operating loss carryforwards | 38,449 | 44,228
Research and development and other credit carryforwards | 7,106 | 5,414
Stock-based compensation | 5,577 | 3,164
Fixed assets and intangibles | (6,160) | (4,869)
Net non-current deferred tax assets | 44,972 | 47,937
Valuation allowance | (3,760) | (4,901)
Total | $ 46,705 | $ 47,623

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