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Share-Based Compensation - Summary of Company's Stock Option Activity (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Granted 1,577,385 40,000
Stock Option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Outstanding, Beginning Balance 589,859  
Shares, Granted 1,577,385  
Shares, Exercised (230,300)  
Shares, Forfeitures (229,901)  
Shares Outstanding, Ending Balance 1,707,043  
Shares, Eligible for exercise 644,799  
Weighted Average Exercise Price, Outstanding, Beginning Balance $ 3.17  
Weighted Average Exercise Price, Granted $ 4.55  
Weighted Average Exercise Price, Exercised $ 2.43  
Weighted Average Exercise Price, Forfeitures $ 4.47  
Weighted Average Exercise Price, Outstanding, Ending Balance $ 4.47  
Weighted Average Exercise Price, Eligible for exercise $ 4.33