Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event (Details)

Subsequent Event (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Dec. 31, 2013
Carrying Value
Jan. 31, 2014
Subsequent Event
Subsequent event    
Warrants to purchase common stock $ 1.0  
Cash received from warrant exercised   5.5
Remaining amount of cash receivable from warrants exercised   0.7
Period in which remaining payments from exercise of warrants are due   12 months
Gain on warrant exercised   $ 5.2