Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

Stock option activity for the six months ended June 30, 2019 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, 2018	1,292,589		$0.79-$10.33	$	3.52	5.93 years	$	671,331
Granted	88,500		$3.40-$3.80	$	3.70
Exercised	(16,060	)	$1.20-$2.60	$	1.29
Canceled and forfeited	(700	)	$4.50	$	4.50
Outstanding, June 30, 2019	1,364,329		$0.79-$10.33	$	3.56	5.78 years	$	722,514
Exercisable, June 30, 2019	910,329			$	3.50		$	655,677
Vested and expected to vest, June 30, 2019	1,296,229			$	3.55		$	712,488