Common stock (Tables)

12 Months Ended

Dec. 31, 2015

Common stock.

Schedule of common stock issued

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

During the year ended December 31, 2014, the Company issued 643,511shares of common stock as follows:

Restricted stock grants	789,394
Restricted stock cancellations	(789,637)
Employee option exercises	564,077
Warrant exercises	79,677
Total common stock issued	643,511