Stock Compensation (Tables)

12 Months Ended

Dec. 31, 2019

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, 2018		4,678,420	$	2.81
Options granted		1,438,695		0.65
Options exercised		(12,500)		0.70
Options forfeited		(9,200)		2.66
Options cancelled or expired		(690,430)		1.54
Outstanding at December 31, 2019		5,404,985	$	2.40		3.52	$	—
Vested or expected to vest at December 31, 2019 (1)		5,401,528	$	2.40		3.52	$	—
Exercisable at December 31, 2019		5,232,179	$	2.40		3.52	$	—

(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,
	2019		2018
Cost of revenues	$	25	$	36
Research and development		85		95
Selling, general and administrative		441		479
Total stock compensation expense	$	551	$	610

Schedule of Key Assumptions of Fair Value of Stock Options Granted

	Twelve Months Ended
	December 31,
	2019			2018
Dividend yield		0	%	0	%
Risk free interest rates		1.77-2.48	%	2.16-2.75	%
Expected  volatility		41.7 to 49.2	%	46.4 to 50.0	%
Expected term (in years)		3.5 to 4.0		3.5 to 4.8