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Stock Incentive Plans - Summary of Option, Unvested RSU Activity and Related Information (Detail) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Available for Grant, Beginning Balance 361,672 718,007 332,995
Shares Available for Grant, Additional options authorized 512,575 357,075 940,884
Shares Available for Grant, Options granted (597,470) (652,078) (585,345)
Shares Available for Grant, Assumed in business combination     0
Shares Available for Grant, RSUs forfeited 61,305 8,200  
Shares Available for Grant, Options forfeited 269,212 77,660 20,591
Shares Available for Grant, Options expired 107,601 5,329 13,781
Shares Available for Grant, Ending Balance 365,074 361,672 718,007
Number of Shares, Beginning Balance 1,577,317 1,031,804 466,965
Number of Shares, Additional options authorized   0 0
Number of Shares, Options granted 597,470 652,078 585,345
Number of Shares, Assumed in business combination     23,229
Number of Shares, Options exercised (5,688) (23,576) (9,363)
Number of Shares, Options forfeited (269,212) (77,660) (20,591)
Number of Shares, Options expired (107,601) (5,329) (13,781)
Number of Shares, Ending Balance 1,792,286 1,577,317 1,031,804
Number of Shares, Vested 990,371    
Number of Shares, Vested and expected to vest 1,757,309    
Weighted-Average Exercise Price, Beginning Balance $ 6.87 $ 7.36 $ 1.99
Weighted-Average Exercise Price, Additional options authorized   0 0
Weighted-Average Exercise Price, Options granted 4.91 6.09 11.76
Weighted-Average Exercise Price, Assumed in business combination     2.06
Weighted-Average Exercise Price, Options exercised 3.29 1.94 2.14
Weighted-Average Exercise Price, Options forfeited 6.64 8.13 10.36
Weighted-Average Exercise Price, Options expired 8.88 10.36 2.74
Weighted-Average Exercise Price, Ending Balance 6.15 $ 6.87 $ 7.36
Weighted-Average Exercise Price, Vested 6.05    
Weighted-Average Exercise Price, Vested and expected to vest $ 6.15    
Restricted Stock Grants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Available for Grant (61,921) (38,121) (4,899)
Shares Available for Grant 61,921 38,121 4,899
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of RSU Shares, Beginning Balance 106,200 0 0
Shares Available for Grant (287,900) (114,400)  
Shares Available for Grant, RSUs forfeited 61,305 8,200  
Number of RSU Shares, vested (26,550)    
Number of RSU Shares, Ending Balance 306,245 106,200 0
Shares Available for Grant 287,900 114,400  
Weighted Average Grant- Date Fair Value, Unvested beginning balance $ 6.49 $ 0 $ 0
Weighted- Average Grant Date Fair Value, RSUs granted 5.50 6.49  
Weighted- Average Grant Date Fair Value, RSUs forfeited 5.81 6.49  
Weighted- Average Grant Date Fair Value, RSUs vested 6.49    
Weighted Average Grant- Date Fair Value, Unvested ending balance $ 5.69 $ 6.49 $ 0