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Stock-Based Compensation - Summary of Stock Option Award Activity (Detail) - 2014 Equity Incentive Plan [Member] - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares, Outstanding, December 31, 2014     1,022,360  
Number of Shares, Granted 25,000 40,000 629,000 654,000
Number of Shares, Exercised     (101,588)  
Number of Shares, Expired     (8,000)  
Number of Shares, Outstanding, September 30, 2015 1,541,772   1,541,772  
Number of Shares, Options exercisable, September 30, 2015 433,806   433,806  
Weighted Average Exercise Price, Outstanding, December 31, 2014     $ 8.16  
Weighted Average Exercise Price, Granted     10.91  
Weighted Average Exercise Price, Exercised     3.18  
Weighted Average Exercise Price, Expired     0.25  
Weighted Average Exercise Price, Outstanding, September 30, 2015 $ 9.65   9.65  
Weighted Average Exercise Price, Options exercisable, September 30, 2015 $ 7.00   $ 7.00