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Shared-Based Payments - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 60 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Mar. 16, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Feb. 28, 2003
Mar. 16, 2011
Stock Option One [Member]
Original Options [Member]
Mar. 16, 2011
Stock Option Two [Member]
Original Options [Member]
Dec. 31, 2013
Stock Option Plan 2000 [Member]
Dec. 31, 2013
Two Thousand and Three Stock Option Plan [Member]
Dec. 31, 2013
Two Thousand and Thirteen Stock Incentive Plan [Member]
Oct. 31, 2013
Two Thousand and Thirteen Stock Incentive Plan [Member]
Dec. 31, 2013
Equity Incentive Plan 2003 [Member]
Dec. 31, 2013
Maximum [Member]
Equity Incentive Plan 2003 [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                            
Aggregate of shares           2,051,644     130,725     1,960,168    
Increase in aggregate of shares     4,336,730   3,790,760       150,297          
Common stock share outstanding   3,200,958 3,249,541           23,657 2,559,011 618,290      
weighted average exercise price $ 0.94 $ 4.90 $ 0.94       $ 1.88 $ 4.69 $ 0.83 $ 1.52 $ 19.06      
Common Stock     545,970   1,739,116                  
Percentage of Common stock share outstanding                     4.00%      
Description of exchange ratio of original options with replacement options one-for-one basis                          
Total original Options exchanged for replacement Options   1,921,894                        
Options granted, maximum term                           10 years
Expected life of option term   7 years 7 years 7 years                 7 years  
Common stock, shares issued   1,268,049 863,176 49,883                    
Cash proceeds from exercise of stock options   $ 1,100,000 $ 46,826 $ 53,225                    
Weighted-average grant-date fair value of options granted   $ 6.91 $ 0.94 $ 0.94                    
Aggregate intrinsic value of options exercised   5,400,000 271,929 102,418                    
Fair value of shares vested   487,603 879,024 1,108,107                    
Unrecognized compensation cost related to non-vested stock-based compensation arrangements   $ 7,600,000                        
Unrecognized compensation expense recognition period   4 years