Quarterly report pursuant to Section 13 or 15(d)

Warrants - Additional Information (Details)

v2.4.0.8
Warrants - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Class Of Warrant Or Right [Line Items]          
Fair value of preferred warrant liability $ 0   $ 0   $ 260
Change in fair value of preferred warrants $ 0 $ (263) $ 36 $ (243)