Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Additional Information (Detail)

v3.5.0.2
Stock Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jan. 01, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense   $ 802,000 $ 1,895,000 $ 1,645,000 $ 3,316,000
Unrecognized compensation cost related to unvested stock-based awards granted to employees under the stock option plans   $ 2,400,000   $ 2,400,000  
Unrecognized compensation cost related to unvested stock-based awards granted to employees under the stock option plans, period for recognition       2 years 8 months 12 days  
Stock options exercised       0  
Total intrinsic value of stock options exercised         200,000
Cash received from stock option exercises         100,000
Tax benefit realized upon exercise of option       $ 0 $ 0
2014 Equity Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Remaining shares available for issuance   857,479   857,479  
2004 Employee Stock Purchase Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Remaining shares available for issuance   177,471   177,471  
Additional shares authorized for issuance 100,000        
Plan participants purchased shares       49,366  
Average purchase price under 2004 Employee Stock Purchase Plan   $ 0.24   $ 0.24  
Cash proceeds       $ 12,000