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Stockholders' Equity - Summary of RSU Activity (Detail) - RSU [Member] - 2013 Equity Incentive Plan
6 Months Ended
Jun. 30, 2018
USD ($)
installment
$ / shares
shares
Restricted Stock Units information  
Unrecognized compensation expense related to unvested service RSUs | $ $ 12,331
Number of vesting installments | installment 3
NUMBER OF SHARES  
Unvested at beginning of period | shares 9,667
Granted | shares 0
Forfeited | shares 0
Vested | shares 4,834
Unvested at end of period | shares 4,833
WEIGHTED-AVERAGE GRANT DATE FAIR VALUE  
Unvested at beginning of period | $ / shares $ 4.61
Granted | $ / shares 0.00
Forfeited | $ / shares 0.00
Vested | $ / shares 4.61
Unvested at end of period | $ / shares $ 4.61