Condensed Consolidated Statement of Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2017	22,987,434
Balance at Dec. 31, 2017	$ 230	$ 364,806	$ (443,735)	$ (78,699)
Issuance of shares pursuant to bond conversion (in shares)	215,852
Issuance of shares pursuant to bond conversion	$ 2	1,669		1,671
Stock-based compensation expense		105		105
Issuance of shares (in shares)	13,249
Issuance of shares
Net loss and comprehensive loss			(5,971)	(5,971)
Balance (in shares) at Mar. 31, 2018	23,216,535
Balance at Mar. 31, 2018	$ 232	366,580	(449,706)	(82,894)
Balance (in shares) at Dec. 31, 2018	24,654,911
Balance at Dec. 31, 2018	$ 247	383,521	(470,008)	$ (86,240)
Issuance of shares pursuant to bond conversion (in shares)	485,020			485,020
Issuance of shares pursuant to bond conversion	$ 5	3,199		$ 3,204
Stock-based compensation expense		122		122
Issuance of shares (in shares)	782,814
Issuance of shares	$ 7	7,884		7,891
Net loss and comprehensive loss			(7,260)	(7,260)
Balance (in shares) at Mar. 31, 2019	25,940,052
Balance at Mar. 31, 2019	$ 259	397,622	(479,299)	(81,418)
Stock-based compensation expense (in shares)	17,307
Reclassification of warrant liability to additional paid-in capital(1)		$ 2,896	$ (2,031)	$ 865