Stock Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Stock Compensation [Abstract]

Schedule of Option Activity

		Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (In Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2017			4,768,838	$	3.02
Options granted			587,350		1.78
Options exercised			(99,937)		0.98
Options forfeited			(66,667)		1.78
Options cancelled or expired			(511,164)		4.15
Outstanding at December 31, 2018			4,678,420	$	2.81		4.10	$	12,375
Vested or expected to vest at December 31, 2018	(1)		4,671,164	$	2.81		4.17	$	12,375
Exercisable at December 31, 2018			4,315,667	$	2.87		4.04	$	12,375

(1) The expected to vest options are the result of applying the pre-vesting forfeiture rate assumptions to total unvested options. 

Schedule of Allocation of Non-Cash Stock-Based Compensation

	Twelve Months Ended
	December 31,
	2018		2017
Cost of revenues	$	36	$	24
Research and development		95		97
Selling, general and administrative		479		507
Total stock compensation expense	$	610	$	628

Schedule of Key Assumptions of Fair Value of Stock Options Granted

	Twelve Months Ended
	December 31,
	2018			2017
Dividend yield		0	%	0	%
Risk free interest rates		2.16-2.75	%	0.71-1.65	%
Expected  volatility		46.4 to 50.0	%	45.3 to 59.4	%
Expected term (in years)		3.5 to 4.75		3.5 to 5.0