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Stockholders' Equity - Fair Value of Employee Stock Options (Detail) - $ / shares
3 Months Ended
Jun. 30, 2019
[1]
Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Dividend yield 0.00% 0.00%
Volatility 0.00% 72.25%
Risk-free interest rate 0.00% 2.82%
Expected life of options 0 days 6 years
Weighted average grant date fair value $ 0 $ 1.21
[1] No options were granted during the three months ended June 30, 2019, as such the weighted average assumptions are not applicable.