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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]      
U.S. federal tax statutory rate 35.00% 35.00% 35.00%
Net operating loss $ 14,700,000    
Current income tax 475,000 7,000 0
Deferred tax asset related to net operating loss carryforwards 17,215,000 13,926,000  
Unrealized excess tax benefits from stock-based compensation 1,800,000    
Unrecognized tax benefits 0    
Net current deferred tax asset (liability) 6,335,000 (4,600,000)  
Domestic Tax Authority [Member]
      
Income Tax Contingency [Line Items]      
Net operating loss 50,900,000    
Stock-based compensation related to unrealized excess tax benefits 4,800,000    
State and Local Jurisdiction [Member]
      
Income Tax Contingency [Line Items]      
Net operating loss 34,000,000    
Stock-based compensation related to unrealized excess tax benefits $ 3,500,000