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Stock Incentive Plans - Summary of Option, Unvested RSU Activity under 2014 Equity Incentive Plan and 2016 Inducement Plan and Related Information (Detail)
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares Available for Grant, Beginning Balance 156,429
Shares Available for Grant, Additional options authorized 357,075
Shares Available for Grant, RSUs forfeited 7,500
Shares Available for Grant, RSUs vested 0
Shares Available for Grant, Options granted (159,534)
Shares Available for Grant, Options exercised 0
Shares Available for Grant, Options forfeited 17,792
Shares Available for Grant, Options expired 1,817
Shares Available for Grant, Ending Balance 293,299
Number of Shares, Beginning Balance 1,941,473
Number of Shares, Additional options authorized 0
Number of Shares, Options granted 159,534
Number of Shares, Options exercised (141,387)
Number of Shares, Options forfeited (17,792)
Number of Shares, Options expired (1,817)
Number of Shares, Ending Balance 1,940,011
Weighted-Average Exercise Price, Beginning Balance | $ / shares $ 4.21
Weighted-Average Exercise Price, Additional options authorized | $ / shares 0
Weighted-Average Exercise Price, Options granted | $ / shares 3.61
Weighted-Average Exercise Price, Options exercised | $ / shares 0.57
Weighted-Average Exercise Price, Options forfeited | $ / shares 4.58
Weighted-Average Exercise Price, Options expired | $ / shares 3.55
Weighted-Average Exercise Price, Ending Balance | $ / shares $ 4.64
Number of RSU Shares, forfeited (7,500)
Restricted Stock Grants [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares Available for Grant 8,846
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares Available for Grant 78,934
Shares Available for Grant, RSUs forfeited 7,500
Shares Available for Grant, RSUs vested (69,556)
Number of RSU Shares, Beginning Balance 439,926
Number of RSU Shares, forfeited (7,500)
Number of RSU Shares, Ending Balance 441,804
Weighted Average Grant- Date Fair Value, Unvested beginning balance | $ / shares $ 4.39
Weighted- Average Grant Date Fair Value, RSUs granted | $ / shares 6.31
Weighted- Average Grant Date Fair Value, RSUs forfeited | $ / shares 5.20
Weighted- Average Grant Date Fair Value, RSUs vested | $ / shares 4.24
Weighted Average Grant- Date Fair Value, Unvested ending balance | $ / shares $ 4.79