Annual report pursuant to Section 13 and 15(d)

Common Stock - Additional Information 1 (Detail)

v3.6.0.2
Common Stock - Additional Information 1 (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair value of stock options granted $ 0.53 $ 1.10 $ 6.52
Unrecognized compensation expense related to stock options granted $ 600    
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    
Effect on diluted per share on options, restricted stock units and warrants 5.3 5.8 7.0
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average period, restricted stock awards 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    
Stock Options [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period 10 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    
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    
Restricted Stock Unit [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Weighted-average period, restricted stock awards 1 year 4 months 24 days    
Stock based compensation expense $ 700 $ 1,100 $ 2,200
Total unrecognized compensation expense related to the Company's restricted stock unit awards $ 800