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Stockholders' Equity - Summary of Warrants Issued and Outstanding (Detail)
12 Months Ended 9 Months Ended
Dec. 31, 2012
Sep. 30, 2013
Mar. 29, 2013
Sep. 30, 2013
Exercisable Warrants [Member]
Sep. 30, 2013
Exercisable Warrants [Member]
Warrant 1-1 [Member]
Sep. 30, 2013
Exercisable Warrants [Member]
Warrant 1-5 [Member]
Sep. 30, 2013
Exercisable Warrants [Member]
Warrant 1-6 [Member]
Sep. 30, 2013
Contingent Warrants [Member]
Sep. 30, 2013
Contingent Warrants [Member]
Warrant 1-2 [Member]
Sep. 30, 2013
Contingent Warrants [Member]
Warrant 1-3 [Member]
Sep. 30, 2013
Contingent Warrants [Member]
Warrant 1-4 [Member]
Class of Warrant or Right [Line Items]                      
Date of Issuance         Mar. 22, 2012 Oct. 10, 2012 Mar. 29, 2013   Mar. 22, 2012 Mar. 22, 2012 Mar. 22, 2012
Date of Expiration         2017-03-21 2017-10-09 2017-03-21   2017-03-21 2017-03-21 2017-03-21
Exercise price of warrants 0.37 0.37 0.37   0.37 0.37 0.37   0.37 0.37 0.37
Shares of Common Stock 1,381,113     (7,405,576) 1,381,115 5,524,461 500,000 (1,381,113) 345,278 345,278 690,557