Stockholders' Deficit (Tables)

3 Months Ended

Mar. 31, 2021

Stockholders' Equity Note [Abstract]

Schedule of stock-based compensation expense

	2021		2020
Research and development	$	–	$	3
General and administrative		17		16
Director		7		3
Total stock-based compensation	$	24	$	22

Schedule of option activity under the Company's plans

	2021								2020
Options	Shares		Weighted Average Exercise Price per share		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value		Shares			Weighted Average Exercise Price per share		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at January 1		1,338	$	0.87		–	$	–		1,077		$	1.59		–		–
Granted		–	$	–		–		–		–		$	–		–		–
Canceled		–	$	–						(10	)	$	56.10
Outstanding at March 31		1,338	$	0.87		4.35	$	–		1,067		$	1.07		4.76		–
Vested and expected to vest at March 31		1,320	$	0.88		3.99	$	–		1,062		$	1.59		4.92	$	–
Exercisable at March 31		1,018	$	0.97		3.86	$	–		736		$	1.25		4.60	$	–

Schedule of significant ranges of outstanding and exercisable options

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Term  (in years)		Weighted Average Exercise Price		Number Outstanding		Weighted Average Exercise Price
$0.01 - $0.50		930		4.39	$	0.50		675	$	0.50
$0.51 - $1.00		393		4.36	$	0.78		328	$	0.78
$1.01 - $25.00		2		1.33	$	15.94		2	$	15.94
$25.01 – $625.00		13		0.77	$	28.12		13	$	28.12
Total		1,338		4.34	$	0.87		1,018	$	0.97

Schedule of the company's non-vested shares

Non-vested Shares	Shares			Weighted Average Grant-Date Fair Value
Non-vested at January 1, 2021		381		$	0.57
Vested		(60	)	$	0.57
Non-vested at March 31, 2020		321		$	0.56

Schedule of warrant activity

	2021				2020
	Shares		Weighted Average Exercise Price		Shares		Weighted Average Exercise Price
Outstanding at beginning of period		3,001	$	1.37		2536	$	1.52
Issued		–		$		30	$	0.50
Outstanding at end of period		3,001	$	1.37		2,566	$	1.51
Exercisable at end of period		3,001	$	1.37		2,566	$	1.51

Schedule of warrants outstanding and exercisable

Number of Shares		Weighted Average Remaining Life		Weighted Average Exercise Price per share
	1,551		0.13	$	2.18
	1,450		1.36	$	0.50
	3,001		0.73	$	1.37