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Stock-Based Compensation - Additional Information (Detail) - $ / shares
6 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Common Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee stock purchase plan (ESPP), shares purchased/granted   2,002
2015 Omnibus Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for future grants   1,700,000
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock, granted   87,500
Weighted average grant date fair value   $ 1.11
Employee Stock Purchase Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee stock purchase plan, grant date fair value   $ 0.79
Employee Stock Purchase Plan [Member] | Scenario, Forecast [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee stock purchase plan, grant date fair value $ 0.77  
Minimum [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock vesting period   0 months
Maximum [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock vesting period   48 months