Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2018	$ 6,896	$ 171	$ 218,914	$ (210,774)	$ (1,415)
Beginning Balance, shares at Dec. 31, 2018		17,066,510
Issuance of common stock relative to vesting of restricted stock	(13)	$ 1	(14)
Issuance of common stock relative to vesting of restricted stock, shares		71,122
Issuance of common stock relative to vesting of restricted stock shares forfeited for tax obligations	(13)	$ 1	(14)
Issuance of common stock relative to vesting of restricted stock shares forfeited for tax obligations, shares		71,122
Issuance of common stock pursuant to stock option plans	1,395	$ 4	1,391
Issuance of common stock pursuant to stock option plans, shares		428,313
Stock Issuance Net	$ 9,352	$ 18	9,334
Stock Issuance Net, Shares	1,881,818
Stock-based compensation	$ 516		516
Net loss	(7,247)			(7,247)
Ending Balance at Jun. 30, 2019	10,899	$ 194	230,141	(218,021)	(1,415)
Ending Balance, shares at Jun. 30, 2019		19,447,763
Beginning Balance at Mar. 31, 2019	4,565	$ 175	220,296	(214,491)	(1,415)
Beginning Balance, shares at Mar. 31, 2019		17,500,265
Issuance of common stock relative to vesting of restricted stock	(13)		(13)
Issuance of common stock relative to vesting of restricted stock, shares		4,788
Issuance of common stock relative to vesting of restricted stock shares forfeited for tax obligations	(13)		(13)
Issuance of common stock relative to vesting of restricted stock shares forfeited for tax obligations, shares		4,788
Issuance of common stock pursuant to stock option plans	221	$ 1	220
Issuance of common stock pursuant to stock option plans, shares		60,892
Stock Issuance Net	$ 9,352	$ 18	9,334
Stock Issuance Net, Shares	1,881,818
Stock-based compensation	$ 304		304
Net loss	(3,530)			(3,530)
Ending Balance at Jun. 30, 2019	10,899	$ 194	230,141	(218,021)	(1,415)
Ending Balance, shares at Jun. 30, 2019		19,447,763
Beginning Balance at Dec. 31, 2019	5,071	$ 196	230,615	(224,325)	(1,415)
Beginning Balance, shares at Dec. 31, 2019		19,546,151
Issuance of common stock relative to vesting of restricted stock	(131)		(131)
Issuance of common stock relative to vesting of restricted stock, shares		68,724
Issuance of common stock relative to vesting of restricted stock shares forfeited for tax obligations	(131)		(131)
Issuance of common stock relative to vesting of restricted stock shares forfeited for tax obligations, shares		68,724
Issuance of common stock pursuant to stock option plans	232	$ 1	231
Issuance of common stock pursuant to stock option plans, shares		44,966
Stock Issuance Net	12,289	$ 16	12,273
Stock Issuance Net, Shares		1,580,965
Issuance of stock for Convertible Debentures	21,164	$ 18	21,146
Issuance of stock for Convertible Debentures,Shares		1,819,466
Stock-based compensation	2,077		2,077
Net loss	(14,210)			(14,210)
Ending Balance at Jun. 30, 2020	26,492	$ 231	266,211	(238,535)	(1,415)
Ending Balance, shares at Jun. 30, 2020		23,060,272
Beginning Balance at Mar. 31, 2020	15,083	$ 215	252,420	(236,137)	(1,415)
Beginning Balance, shares at Mar. 31, 2020		21,425,916
Issuance of common stock relative to vesting of restricted stock	(131)		(131)
Issuance of common stock relative to vesting of restricted stock, shares		45,224
Issuance of common stock relative to vesting of restricted stock shares forfeited for tax obligations	(131)		(131)
Issuance of common stock relative to vesting of restricted stock shares forfeited for tax obligations, shares		45,224
Issuance of common stock pursuant to stock option plans	36		36
Issuance of common stock pursuant to stock option plans, shares		8,167
Stock Issuance Net	12,289	$ 16	12,273
Stock Issuance Net, Shares		1,580,965
Stock-based compensation	1,613		1,613
Net loss	(2,398)			(2,398)
Ending Balance at Jun. 30, 2020	$ 26,492	$ 231	$ 266,211	$ (238,535)	$ (1,415)
Ending Balance, shares at Jun. 30, 2020		23,060,272