Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Deficit) - Schedule of Stock-based Compensation Expense (Detail)

v3.7.0.1
Stockholders' Equity (Deficit) - Schedule of Stock-based Compensation Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense $ 1,778 $ 1,481 $ 1,903 $ 1,522
Sales and Marketing [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense 116 24 155 48
Research and Development [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense 92 6 104 12
General and Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense 1,570 1,451 1,644 1,462
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense 375 28 451 48
Common Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense 125   125  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense $ 1,278 $ 1,453 $ 1,327 $ 1,474