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Total Unrecognized Compensation Costs Related to Non-Vested Stock-Based Compensation Arrangements (Detail) - USD ($)
Jun. 30, 2017
Mar. 31, 2017
Employee Service Share -Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized [Line Items]    
Unrecognized compensation cost $ 791,000  
Common stock options    
Employee Service Share -Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized [Line Items]    
Unrecognized compensation cost   $ 435,739