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Income Taxes - Summary of Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Deferred tax assets:    
Net operating loss carry forwards $ 0 $ 0
Research and development credits 0 0
Depreciation and amortization (71) (105)
Accrued expenses and reserves 1,373 862
Stock compensation 6,720 5,584
Other, net 7 12
Total deferred tax assets 8,029 6,353
Valuation allowance (8,029) (6,353)
Deferred tax assets net $ 0 $ 0