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Stockholders' Equity (Additional Information) (Detail) (USD $)
0 Months Ended 1 Months Ended 9 Months Ended
Sep. 23, 2013
Sep. 18, 2013
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
May 08, 2013
Class of Stock [Line Items]              
Preferred stock, shares authorized       5,000,000   5,000,000  
Preferred stock, par value (usd per share)       $ 0.0001   $ 0.0001  
Common stock, shares authorized       200,000,000   200,000,000  
Common stock, par value (usd per share)       $ 0.0001   $ 0.0001  
Issuance of common stock, shares   17,500,000          
Share Price   $ 2.00          
Proceeds from Issuance or Sale of Equity $ 5,200,000 $ 35,000,000   $ 263,000 $ 69,000    
Number of Shares Per Unit   1          
Number of shares availabe from warrants   0.35          
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 2.50         $ 2.47
Proceeds From Issuance or Sale of Equity, Net Underwriting Discounts, Commissions and Offering Expenses     $ 37,500,000        
Common Stock [Member]
             
Class of Stock [Line Items]              
Stock Issued During Period, Shares, Overallotment Option   2,625,000          
Warrants to purchase common stock [Member]
             
Class of Stock [Line Items]              
Stock Issued During Period, Shares, Overallotment Option   918,750