Common stock (Tables)

12 Months Ended

Dec. 31, 2016

Common stock

Schedule of common stock issued

During the year ended December 31, 2016, the Company issued 3,474,944 shares of common stock as follows:

Restricted stock grants	59,260
Restricted stock cancellations	(164,455)
Preferred stock converted to common	2,162,907
Employee option exercises	1,417,232
Total common stock issued	3,474,944

During the year ended December 31, 2015, the Company issued 510,390 shares of common stock as follows:

Restricted stock grants	752,835
Restricted stock cancellations	(1,025,559)
Employee option exercises	783,114
Total common stock issued	510,390