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Fair Value Measurements - Schedule of Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 3,227  
Ending balance 2,660 $ 3,227
Warrants    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 3,227 2,999
Mark to market adjustment (567) 228
Ending balance $ 2,660 $ 3,227