Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Stock option activity for the three months ended March 31, 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	28,000		$3.62-$3.80	$	3.64
Exercised	(10,000	)	$1.20	$	1.20
Canceled and forfeited	(700	)	$4.50	$	4.50
Outstanding, March 31, 2019	1,309,889		$0.79-$10.33	$	3.54	5.81 years	$	948,892
Exercisable, March 31, 2019	854,639			$	3.47		$	786,297
Vested and expected to vest, March 31, 2019	1,241,602			$	3.53		$	924,502