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Income taxes (Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Current deferred tax assets |  |
Net operating loss carryforwards | $ 40,465 | $ 36,427
Research and development and other credit carryforwards | 11,761 | 8,614
Stock-based compensation | 6,389 | 6,942
Reserves and allowances | 3,181 | 3,266
Fixed assets and intangibles | 378 | (3,688)
Net non-current deferred tax assets | 62,174 | 51,561
Valuation allowance | (62,174) | (2,934)
Total | $ 0 | $ 48,627

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