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Description of the Business - Planned Commercial Operations Have Not Commenced - Additional Information (Detail) (USD $)
 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jan. 15, 2014
Initial Public Offering [Member]
Schedule To Nature Of Business [Line Items]      
Company incorporated state Delaware    
Company incorporated date Apr. 04, 2003    
Operations commenced date May 21, 2003    
Sale of common stock through Initial public offering     8,050,000
Price of common stock under IPO     $ 8.00
Proceeds from issuance of common stock, net of issuance costs $ 57,248,219 $ 0 $ 57,248,219