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Stockholders' Equity - Summary of RSU Activity (Detail) - RSU [Member] - 2013 Equity Incentive Plan
6 Months Ended
Jun. 30, 2016
USD ($)
installment
$ / shares
shares
Restricted Stock Units information  
Unrecognized compensation expense related to unvested service RSUs | $ $ 79,896
Number of vesting installments | installment 3
RSU activity  
Number of Shares Unvested, Beginning balance | shares 4,833
Number of Shares, Granted | shares 14,500
Number of Shares, Forfeited | shares 0
Number of Shares, Vested | shares 0
Number of Shares Unvested, Ending balance | shares 19,333
Weighted Average Grant Date Fair Value Unvested , Beginning balance | $ / shares $ 7.62
Weighted Average Grant Date Fair Value , Granted | $ / shares 4.61
Weighted Average Grant Date Fair Value , Forfeited | $ / shares 0.00
Weighted Average Grant Date Fair Value , Vested | $ / shares 0.00
Weighted Average Grant Date Fair Value Unvested, Ending balance | $ / shares $ 5.36