Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Schedule of Common Stock (Detail)

v2.4.0.8
Common Stock - Schedule of Common Stock (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 6 Months Ended 9 Months Ended
Jul. 02, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Common stock [Member]
Sep. 30, 2014
Series B Pre-Funded Common Stock Warrants [Member]
Sep. 30, 2014
Series A Common Stock Warrants [Member]
Sep. 30, 2014
Series B Common Stock Warrants [Member]
Class of Warrant or Right [Line Items]              
Units Issued   21,290,093 14,707,886 5,559,866      
Warrants Issued         1,340,538 2,779,933 670,269
Gross Proceeds $ 24,000     $ 14,084 $ 3,387 $ 5,261 $ 1,268
Underwriting discount and offering expense $ 1,600 $ 100   $ 885 $ 213 $ 428 $ 103