Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation (Details)

v2.4.0.8
Stock-based compensation (Details) (Employee Stock Option [Member], USD $)
 6 Months Ended
Jun. 30, 2014
Employee Stock Option [Member]
  
Number of shares, Converted outstanding options at January 1, 2014 4,402,890
Number of shares, Granted   
Number of shares, Exercised (477,795)
Number of shares, Cancelled (76,702)
Number of shares, Outstanding ending balance 3,848,393
Number of shares, Options exercisable ending 3,918,139
Weighted average exercise price, Outstanding beginning balance $ 0.11
Weighted average exercise price, Granted   
Weighted average exercise price, Exercised $ 0.11
Weighted average exercise price, Cancelled $ 0.11
Weighted average exercise price, Outstanding ending balance $ 0.11
Weighted average exercise price, Options exercisable $ 0.10
Aggregate intrinsic value, Outstanding beginning balance $ 937,816
Aggregate intrinsic value, Granted   
Aggregate intrinsic value, Exercised (101,293)
Aggregate intrinsic value, Cancelled (16,107)
Aggregate intrinsic value, Outstanding ending balance 808,163
Aggregate intrinsic value, Options exercisable $ 861,991