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Stockholders' Equity - Schedule of Restricted Stock Unit Activity (Detail) - Restricted Stock Unit [Member]
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]  
Number of Outstanding Restricted Stock Units, Beginning Balance | shares 216,700
Number of Outstanding Restricted Stock Units, Granted | shares 75,000
Number of Outstanding Restricted Stock Units, Forfeited | shares (1,500)
Number of Outstanding Restricted Stock Units, Ending Balance | shares 290,200
Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares $ 0.85
Weighted Average Grant Date Fair Value, Granted | $ / shares 0.52
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 0.85
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 0.76