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Stock-based Compensation - Summary of Company's Stock Option Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Number of Options, Outstanding at beginning of year 1,516,059  
Number of Options, Granted 680,400  
Number of Options, Exercised 0 0
Number of Options, Forfeited (394,409)  
Number of Options, Outstanding at end of year 1,802,050 1,516,059
Number of Options, Vested 822,736  
Number of Options, Unvested 979,314  
Number of Options, Vested or expected to vest, December 31, 2017 1,802,050  
Number of Options, Exercisable, December 31, 2017 822,736  
Weighted-Average Exercise Price, Outstanding at beginning of year $ 7.25  
Weighted-Average Exercise Price, Granted 5.17  
Weighted-Average Exercise Price, Forfeited 6.71  
Weighted-Average Exercise Price, Outstanding at end of year 6.59 $ 7.25
Weighted-Average Exercise Price, Vested 7.19  
Weighted-Average Exercise Price, Unvested 6.08  
Weighted-Average Exercise Price, Vested or expected to vest, December 31, 2017 6.59  
Weighted-Average Exercise Price, Exercisable, December 31, 2017 $ 7.19  
Weighted-Average Remaining Contractual Life, Outstanding 4 years 10 months 9 days 5 years 2 months 8 days
Weighted-Average Remaining Contractual Life, Vested 3 years 10 months 6 days  
Weighted-Average Remaining Contractual Life, Unvested 5 years 8 months 15 days  
Weighted-Average Remaining Contractual Life, Vested or expected to vest, December 31, 2017 4 years 10 months 9 days  
Weighted-Average Remaining Contractual Life, Exercisable, December 31, 2017 3 years 10 months 6 days  
Aggregate Intrinsic Value, Outstanding $ 48  
Aggregate Intrinsic Value, Outstanding 8 $ 48
Aggregate Intrinsic Value, Unvested 8  
Aggregate Intrinsic Value, Vested or expected to vest, December 31, 2017 $ 8