CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at beginning of period at Dec. 31, 2018		$ 23	$ 53,796	$ (47,696)	$ 6,123
Balance at beginning of period (in shares) at Dec. 31, 2018	47	2,298,738
Increase (Decrease) in Stockholders' Equity
Net loss				(1,652)	(1,652)
Conversion of convertible notes into common stock		$ 12	3,114		3,126
Conversion of convertible notes into common stock (in shares)		1,248,115
Issuance of common stock in connection with purchase agreements		$ 8	1,718		1,726
Issuance of common stock in connection with purchase agreements (in shares)		758,076
Write-off debt discounts (net of debt premiums) in conjunction with convertible note conversions			315		315
Write-off debt derivative liability in conjunction with convertible note conversions			39		39
Sock-based compensation			156		156
Balance at end of period at Mar. 31, 2019		$ 43	59,138	(49,348)	9,833
Balance at end of period (in shares) at Mar. 31, 2019	47	4,304,929
Balance at beginning of period at Dec. 31, 2018		$ 23	53,796	(47,696)	6,123
Balance at beginning of period (in shares) at Dec. 31, 2018	47	2,298,738
Balance at end of period at Dec. 31, 2019		$ 79	74,065	(60,939)	13,205
Balance at end of period (in shares) at Dec. 31, 2019	47	7,898,117
Increase (Decrease) in Stockholders' Equity
Net loss				(3,205)	(3,205)
Conversion of convertible notes into common stock		$ 4	349		353
Conversion of convertible notes into common stock (in shares)		427,997
Issuance of common stock in connection with purchase agreements		$ 12	1,338		1,350
Issuance of common stock in connection with purchase agreements (in shares)		1,180,012
Write-off beneficial conversion feature in conjunction with convertible note extinguishment			(523)		(523)
Write-off debt discounts (net of debt premiums) in conjunction with convertible note conversions			(63)		(63)
Sock-based compensation			168		168
Balance at end of period at Mar. 31, 2020		$ 95	$ 75,334	$ (64,144)	$ 11,285
Balance at end of period (in shares) at Mar. 31, 2020	47	9,506,126