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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Aug. 31, 2015
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate shares of Common Stock that may be delivered under options outstanding   503,062
Number of options to purchase common stock, Granted   365,555
Unrecognized stock-based compensation expenses   $ 5,636
Unrecognized stock-based compensation expense, period for recognition   2 years 3 months 18 days
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   48 months
Employee Stock Option [Member] | Time Based Options Vesting One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period   36 months
Award vesting term   25% on the first anniversary of the option grant date and the remainder in 36 equal monthly installments beginning in the month after the vesting start date.
Award vesting percentage   25.00%
Employee Stock Option [Member] | Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options to purchase common stock, Granted   343,555
Aggregate amount of fair value of options   $ 659
Employee Stock Option [Member] | Director [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options to purchase common stock, Granted   22,000
Aggregate amount of fair value of options   $ 42
Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of units, outstanding   5,187
Weighted average grant date fair value, Outstanding   $ 5.50
Total grant date fair value, outstanding   $ 29
Restricted Stock Units [Member] | Other Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 2 years  
Stock-based compensation   $ 7
Restricted stock units, granted 10,374  
2013 Employee, Director and Consultant Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted   0
Shares available for future grant   1,149,194
2013 Employee, Director and Consultant Equity Incentive Plan [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted   4,193,075
Employee, Director, and Consultant Stock Plan (the "2003 Plan") [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted   0