Stockholders' Equity-Common and Preferred Shares - Summary of Company's Outstanding Common Stock Warrants (Detail)	Dec. 31, 2013	Sep. 23, 2013	Dec. 31, 2012
Class of Warrant or Right [Line Items]
Exercise Price	2.24	2.24
Total Number of Warrants Outstanding	5,178,000		13,000
Committed Equity Financing Facility [Member]
Class of Warrant or Right [Line Items]
Date of Issuance	Feb. 19, 2008
Exercise Price	657.60
Total Number of Warrants Outstanding			1,000
Direct Registration Series I Warrants [Member]
Class of Warrant or Right [Line Items]
Date of Issuance	Jul. 20, 2009
Exercise Price	504.00
Total Number of Warrants Outstanding	12,000		12,000
Private Placement Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Date of Issuance	Apr. 16, 2013
Exercise Price	3.40
Total Number of Warrants Outstanding	1,460,000
Private Placement Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Date of Issuance	Apr. 16, 2013
Exercise Price	3.40
Total Number of Warrants Outstanding	1,107,000
Private Placement Warrants [Member]
Class of Warrant or Right [Line Items]
Date of Issuance	Sep. 23, 2013
Exercise Price	2.24
Total Number of Warrants Outstanding	2,452,000
Private Placement Warrants One [Member]
Class of Warrant or Right [Line Items]
Date of Issuance	Sep. 23, 2013
Exercise Price	2.80
Total Number of Warrants Outstanding	147,000