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Significant accounting policies (Details 2)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Series A Preferred Stock
    
Net loss per share    
Amount excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect (in shares)   3,065
Series B Preferred Stock
    
Net loss per share    
Amount excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect (in shares)   6,771
Outstanding stock options and restricted stock units
    
Net loss per share    
Amount excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect (in shares) 2,170 687
Founders' stock
    
Net loss per share    
Amount excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect (in shares) 1,316 1,974