Common Stock (Tables)

9 Months Ended

Sep. 30, 2018

Common Stock

Summary of common stock activity

The table below summarizes our common stock activity (shares):

Balance, December 31, 2017	10,596,566
Option and warrant exercises	314,698
Vesting of restricted stock units, net of shares withheld for taxes	22,725
Balance, September 30, 2018	10,933,989