Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Stock option activity for the six months ended June 30, 2018 was as follows:



Common Stock Options	Number of Options		Exercise Price Per Share	Weighted Average Exercise Price		Weighted Average Remaining Life	Aggregate Intrinsic Value
Outstanding, December 31, 2017	1,061,552		$0.79-$18.15	$	3.60	4.95 years	$	291,449
Granted	284,000		$2.30-$4.04	$	3.52
Exercised	(52,754	)	$1.20	$	1.20
Canceled and forfeited	(70,009	)	$2.60-$18.15	$	6.79
Outstanding, June 30, 2018	1,222,789		$0.79-$10.33	$	3.50	6.16 years	$	641,623
Exercisable, June 30, 2018	784,914			$	3.33		$	592,968
Vested and expected to vest, June 30, 2018	1,157,108			$	3.48		$	634,324