Stockholders' Equity - Schedule of Outstanding Common Stock Warrants (Detail)	Mar. 31, 2014
Class of Warrant or Right [Line Items]
Total Warrants	21,047,641
Ex. Price $ 11.35 [Member]
Class of Warrant or Right [Line Items]
Issue Date	May 07, 2009
Expiration Date	May 07, 2014
Total Warrants	200,000
Ex. Price	11.35
Ex. Price $ 1.12 [Member]
Class of Warrant or Right [Line Items]
Issue Date	Apr. 26, 2013
Expiration Date	Apr. 26, 2018
Total Warrants	693,202
Ex. Price	1.12
Ex. Price $ 0.85 [Member]
Class of Warrant or Right [Line Items]
Issue Date	Oct. 31, 2013
Expiration Date	Oct. 31, 2018
Total Warrants	6,857,142
Ex. Price	0.85
Ex. Price $ 0.74 [Member]
Class of Warrant or Right [Line Items]
Issue Date	Feb. 05, 2014
Expiration Date	Feb. 05, 2019
Total Warrants	13,297,297
Ex. Price	0.74