v2.4.0.8
Fair Value Measurements (Details) (Recurring basis, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Total
   
Assets:    
Cash equivalents $ 76,412 $ 3,357
Liabilities:    
Series D redeemable convertible preferred stock warrants   126
Level 1
   
Assets:    
Cash equivalents 76,412 3,357
Level 3
   
Liabilities:    
Series D redeemable convertible preferred stock warrants   $ 126