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Stock-based compensation (Details 2) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Stock options          
Outstanding at beginning of period (in shares)     1,226,140    
Granted (in shares)     360,530    
Exercised (in shares)     (25,045)    
Cancelled or forfeited (in shares)     (27,424)    
Outstanding at end of period (in shares) 1,534,201   1,534,201   1,226,140
Exercisable at end of period (in shares) 690,832   690,832    
Vested or expected to vest at end of period (in shares) 1,410,518   1,410,518    
Weighted-Average Exercise Price          
Outstanding at beginning of period (in dollars per share)     $ 4.14    
Granted (in dollars per share)     10.64    
Exercised (in dollars per share)     2.05    
Cancelled or forfeited (in dollars per share)     4.09    
Outstanding at end of period (in dollars per share) $ 5.70   5.70   $ 4.14
Exercisable at end of period (in dollars per share) 3.06   3.06    
Vested or expected to vest at end of period (in dollars per share) $ 5.46   $ 5.46    
Average Remaining Contractual          
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2     8 years 1 month 28 days   8 years 1 month 24 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2     8 years 1 month 28 days   8 years 1 month 24 days
Exercisable at end of period     7 years 7 days    
Vested or expected to vest at end of period     8 years 22 days    
Intrinsic Value          
Outstanding at the end of the period $ 9,980,000   $ 9,980,000   $ 6,579,000
Exercisable at the end of the period 6,318,000   6,318,000    
Fair value of options vested     9,524,000    
Options to purchase Common Stock          
Intrinsic Value          
Intrinsic value of options exercised 0 $ 7,000 200,000 $ 28,000  
Fair value of options vested 200,000 $ 100,000 800,000 $ 300,000  
Unrecognized stock-based compensation expense          
Unrecognized compensation expense related to unvested stock option awards $ 4,200,000   $ 4,200,000    
Weighted-average amortization period over which cost is expected to be recognized     3 years