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Description of Business and Summary of Significant Accounting Policies - Activity for Liabilities Measured at Estimated Fair Value Using Unobservable Inputs (Detail) - Significant Other Unobservable Inputs (Level 3) [Member] - Warrants [Member] - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Warrant Derivative Liability, Beginning balance $ 4 $ 126
Issuances 0 0
Adjustments to estimated fair value (4) 17
Warrant liability removal due to settlements 0 (139)
Warrant Derivative Liability, Ending balance $ 0 $ 4