Stockholders' Equity (Deficit) (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Schedule of allocation of stock-based compensation expense

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Research and development	$	8	$	23	$	17	$	54
General and administrative	$	32	$	1	$	73	$	14
Director and consultant options	$	8	$	2	$	17	$	7
Total stock-based compensation expense	$	48	$	26	$	107	$	75

Schedule of option activity under the Company's plans

	2019								2018
Options	Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value		Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding at January 1,		1,037	$	1.65		−	$	−		736		$	3.65			$	−
Granted		40	$	0.50		−	$	−		−		$	−			$	−
Forfeited or expired		−	$	−		−	$	−		(10	)	$	79.80			$	−
Outstanding at June 30		1,077	$	1.61		5.50	$	−		726		$	2.56		5.94	$	−
Vested and expected to vest at June 30		1,070	$	1.61		5.50	$	−		696		$	2.69		5.93	$	−
Exercisable at June 30		489	$	2.77		5.16	$	−		213		$	7.50		5.32	$	−

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 per share		Number Outstanding		Weighted Average Exercise Price per Share
$0.01 – $0.50		655		5.27	$	0.50		361	$	0.50
$0.51 – $625.00		422		5.85	$	3.33		128	$	9.20
Total		1,077		5.50	$	1.61		489	$	2.77

Schedule of the company's non-vested shares

Non-vested Shares	Shares			Weighted Average Grant-Date Fair Value per share
Non-vested at January 1, 2019		718		$	0.54
Granted		40		$	0.50
Vested		(170	)	$	0.63
Non-vested at June 30, 2019		588		$	0.64

Schedule of warrant activity

	2019				2018
	Shares		Weighted Average Exercise Price Per Share		Shares			Weighted Average Exercise Price Per Share
Outstanding at beginning of period		1,828	$	2.08		1,878		$	2.46
Issued		985	$	0.50		−		$	−
Expired		−	$	−		(39	)	$	15.63
Outstanding at end of period		2,813	$	1.53		1,839		$	1.58
Exercisable at end of period		2,813	$	1.53		1,839		$	1.58

Schedule of warrants outstanding and exercisable

Number of Warrants	Weighted Average Remaining Life (years)		Weighted Average Exercise Price per share
1,550		1.91	$	2.18
278		0.26	$	1.63
985		2.64	$	0.50
2,813		2.00	$	1.53