Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Additional Information (Detail)

v3.7.0.1
Stock Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Jan. 01, 2017
Mar. 31, 2017
Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense   $ 505,000 $ 843,000
Unrecognized compensation cost related to unvested stock-based awards granted to employees under the stock option plans   $ 2,900,000  
Unrecognized compensation cost related to unvested stock-based awards granted to employees under the stock option plans, period for recognition   2 years 3 months 18 days  
Stock options exercised   0 0
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   1,659,008  
2004 Employee Stock Purchase Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Remaining shares available for issuance   203,165  
Additional shares authorized for issuance 100,000    
Plan participants purchased shares   31,624  
Average purchase price under 2004 Employee Stock Purchase Plan   $ 0.25  
Cash proceeds   $ 7,000