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Fair value measurement (Details 2) (Fair value of contingent consideration, USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Feb. 22, 2013
Endeka
Mar. 31, 2014
Endeka
Mar. 31, 2014
Endeka and AWG
Oct. 31, 2013
AWG
Mar. 31, 2014
AWG
Fair value measurement          
Discount rate (as a percent) 50.50% 20.00%   3.10% 3.10%
Reconciliation between the beginning and ending balances of preferred stock warrants          
Balance at the beginning of the period     $ 1,942    
Change in fair value     (378)    
Balance at the end of the period     $ 1,564