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Stock-Based Compensation - Stock Options - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Lower range of exercise prices   $ 5.50  
Upper range of exercise prices   11.00  
Intrinsic value based on share price   $ 4.71  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee stock options vesting provisions, description   The Company grants new stock options with a seven-year life that contain installment vesting over a period of four years, 25% after one year, and monthly thereafter.  
Options vested in remaining period   4 years  
Options vesting percentage after one year   25.00%  
Period of termination of employment   90 days  
Stock options granted period   7 years  
Proceeds from options exercised $ 100   $ 300
Options exercised 11,350,000 0 35,134,000
Options granted   0  
Intrinsic value $ 3   $ 34
Lower range of exercise prices   $ 5.50  
Upper range of exercise prices   $ 11.00  
Period of expected life, options granted   5 years  
Unrecognized compensation expense   $ 200  
Weighted average period   1 year 1 month 6 days