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Summary of Significant Accounting Policies - Schedule of Dilutive Securities Used In Calculation of Diluted Earnings Per Share (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Series A-1 Convertible Preferred Stock [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred Stock    2,156,114 2,156,114
Series A-2 Convertible Preferred Stock [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred Stock    392,274 392,274
Series B Convertible Preferred Stock [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred Stock    4,336,037 4,336,037
Series C Convertible Preferred Stock [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred Stock    5,909,906 5,909,906
Series D Convertible Preferred Stock [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred Stock    769,468 769,468
Series D-2 Convertible Preferred Stock [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred Stock    3,391,991 3,391,991
Effect of Convertible Preferred Stock [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred Stock 13,189,920      
Warrant [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred Stock    180,784 180,784
Stock Options [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Preferred Stock 2,313,970 3,249,702 2,885,417