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Subsequent Events - Additional Information (Detail) (USD $)
 0 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Oct. 22, 2013
May 27, 2013
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2013
West Crest Limited [Member]
Sep. 30, 2014
Restricted Shares [Member]
Dec. 31, 2013
Restricted Shares [Member]
May 08, 2014
2013 Plan [Member]
Restricted Shares [Member]
Employees [Member]
Sep. 30, 2014
2013 Plan [Member]
Restricted Shares [Member]
Employees [Member]
Oct. 09, 2014
2013 Plan [Member]
Restricted Shares [Member]
Employees [Member]
Subsequent Event [Member]
Dec. 31, 2013
2011 Plan [Member]
Employee Stock Option [Member]
January 16, 2014 [Member]
Employees [Member]
Vesting Period From January 1, 2015 To January 1, 2018 [Member]
Dec. 31, 2013
2011 Plan [Member]
Employee Stock Option [Member]
January 16, 2014 [Member]
Employees [Member]
Vesting Period From January 16, 2014 To January 16, 2017 [Member]
Jan. 16, 2014
2011 Plan [Member]
Employee Stock Option [Member]
January 16, 2014 [Member]
Employees [Member]
Subsequent Event [Member]
Jan. 16, 2014
2011 Plan [Member]
Employee Stock Option [Member]
January 16, 2014 [Member]
Employees [Member]
Subsequent Event [Member]
Vesting Period From January 1, 2015 To January 1, 2018 [Member]
Jan. 16, 2014
2011 Plan [Member]
Employee Stock Option [Member]
January 16, 2014 [Member]
Employees [Member]
Subsequent Event [Member]
Vesting Period From January 16, 2014 To January 16, 2017 [Member]
Subsequent Event [Line Items]                              
Number of options, Granted 228,000 560,000 177,600                   177,600 120,000 57,600
Weighted average exercise price, Granted $ 2.20 $ 2.20 $ 2.20                   $ 2.20    
Contractual term                         10 years    
Award vesting period                 All five tranches will vest over a period of four years, with 25% of the awards vesting on various dates ranging from March 14, 2015 to May 13, 2015, with the remainder of the awards vesting on an annual basis thereafter.   January 1, 2015 to January 1, 2018, with 25% of the awards vesting on January 1, 2015 and the remainder of the awards vesting on an annual basis each January 1, thereafter January 16, 2014 to January 16, 2017, with 25% of the awards vesting on January 16, 2014 and the remainder of the awards vesting on an annual basis each January 16, thereafter      
Percentage of awards vesting                 25.00%       25.00%    
Payment date of outstanding payable         Jan. 29, 2014                    
Company name change date       Mar. 31, 2014                      
Number of shares, Granted           100,000 400,000 100,000   406,000