Annual report pursuant to Section 13 and 15(d)

Stock Plans and Stock-Based Compensation - Summary of Stock Option Activity (Detail)

v3.3.1.900
Stock Plans and Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Shares Subject to Outstanding Options    
Outstanding at the beginning of period 991,010  
Options granted 845,703  
Options exercised 0  
Options forfeited (15,631)  
Options expired (16,999)  
Outstanding as end of period 1,804,083 991,010
Vested and expected to vest 1,757,991  
Exercisable 783,856  
Weighted-Average Exercise Price of Options    
Outstanding at the beginning of period $ 6.09  
Options granted 9.00  
Options exercised 0  
Options forfeited 4.75  
Options expired 12.31  
Outstanding as end of period 7.41 $ 6.09
Vested and expected to vest 7.38  
Exercisable $ 6.28  
Weighted-Average Remaining Contractual Term (Years)    
Outstanding 8 years 2 months 27 days 0 years
Vested and expected to vest 8 years 2 months 19 days  
Exercisable 7 years 9 months 22 days  
Aggregate Intrinsic Value (In Thousands)    
Outstanding at the beginning of period   $ 0
Outstanding as end of period $ 0  
Vested and expected 0  
Exercisable $ 0