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Equity Incentive Plans - Schedule of Stock Option Plan (Details)
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Number of options  
Number of options, Outstanding at beginning of year | shares 11,377,354
Number of options, Granted | shares 2,640,500
Number of options, Exercised | shares (427,191)
Number of options, Forfeited and cancelled | shares (47,699)
Number of options, Outstanding at ending of year | shares 13,542,964
Number of options, Exercisable options | shares 6,644,144
Number of options, Vested and expected to vest | shares 13,542,964
Weighted average exercise price  
Weighted average exercise price, Outstanding at beginning of year | $ / shares $ 9.76
Weighted average exercise price, Granted | $ / shares 7.15
Weighted average exercise price, Exercised | $ / shares 0.17
Weighted average exercise price, Forfeited and cancelled | $ / shares 18.01
Weighted average exercise price, Outstanding at end of year | $ / shares 9.53
Weighted average exercise price, Exercisable options | $ / shares 7.25
Weighted average exercise price, Vested and expected to vest | $ / shares $ 9.53