Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Taxes [Abstract]

Schedule of Net Loss Before Income Taxes

	For the Years Ended
	December 31,
	2019		2018
Domestic, current	$	(4,298)	$	(9,542)
Total	$	(4,298)	$	(9,542)

Schedule of Deferred Taxes

	For the Years Ended
	December 31,
	2019		2018
Deferred tax assets:
Federal and state net operating loss carryforwards	$	30,428	$	30,350
Research and development tax credit carryforwards		2,479		2,438
Stock based compensation		1,632		1,470
Other provision and expenses not currently deductible		1,327		1,345
Total deferred tax assets		35,866		35,603
Deferred tax liabilities:
Depreciation and amortization		(693)		(726)
Prepaid expenses		(195)		(151)
Total deferred liabilities		(888)		(877)
Less: valuation allowance		(34,978)		(34,726)
Net deferred tax asset	$	—	$	—

Schedule of Federal Net Operating Losses and Tax Credit Carryforwards

		Net		Research and
		Operating		Development
		Losses		Tax Credits
2019-2020	$	24,931	$	653
2021-2024		41,283		-
2025-2037		61,755		1,826
No Expiration		14,705		-
	$	142,674	$	2,479

Schedule of Reconciliation of Effective Tax Rate

	For the Years Ended
	December 31,
	2019		2018
U.S. Federal income tax benefit at federal statutory rate	21	%	21	%
Change in valuation allowance	(6)		(21)
Permanent differences	7		(3)
NOL Expiration - 1998	(26)		-
Other, net	4		3
Effective tax rate	-	%	-	%