Registration of securities issued in business combination transactions

Common Stock - Additional Information 1 (Detail)

v3.7.0.1
Common Stock - Additional Information 1 (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense related to stock options granted $ 400   $ 600    
Weighted average fair value of stock options granted     $ 0.53 $ 1.10 $ 6.52
Estimated grant date fair value of stock options vested     $ 1,000 $ 1,300 $ 1,900
Aggregate intrinsic value of options exercised     0 2,787 51,100
Aggregate intrinsic value of the outstanding options     0    
Aggregate intrinsic value of the exercisable outstanding options     $ 0    
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average period, restricted stock awards 1 year 1 month 6 days   1 year 3 months 18 days    
Stock Options [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award expiration period 7 years   7 years    
Stock Options [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award expiration period 10 years   10 years    
Stock Options [Member] | Employees and Consultants [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 4 years        
Stock Options [Member] | Employees and Consultants [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Stock Options [Member] | Employees and Consultants [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     4 years    
Stock Options [Member] | Board of Directors [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 1 year   1 year    
Stock Options [Member] | Board of Directors [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 3 years   3 years    
Restricted Stock Unit [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average period, restricted stock awards 1 year 2 months 12 days   1 year 4 months 24 days    
Award vesting period 4 years   4 years    
Stock based compensation expense $ 100 $ 200 $ 700 $ 1,100 $ 2,200
Total unrecognized compensation expense related to the Company's restricted stock unit awards $ 700   $ 800