CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 8,150	$ 8,129
Restricted cash	7,481	7,500
Accounts receivable, net of allowance for doubtful accounts of $186 and $184, respectively	3,208	4,386
Inventories	3,471	3,027
Prepaid expenses and other current assets	487	513
Total current assets	22,797	23,555
Property and equipment, net	5,379	5,369
Operating lease right-of-use assets, net	1,235	1,314
Intangible assets, net	7,503	7,955
Goodwill	8,803	8,803
Other assets	330	347
Total assets	46,047	47,343
Current liabilities:
Note payable	7,275	7,275
Accounts payable	2,102	1,880
Other accrued liabilities	5,150	5,134
Current portion of operating lease liabilities	343	313
Deferred revenues	1,934	2,832
Total current liabilities	16,804	17,434
Long-term liabilities:
Deferred tax liability	88	0
Long-term operating lease liabilities, net	988	1,078
Other liabilities	119	178
Total liabilities	17,999	18,690
Commitments and contingencies (see Note 15)
Stockholders' equity:
Common Stock, $.001 par value, 150,000,000 shares authorized; 33,714,362 and 32,932,273 shares issued and outstanding at March 31, 2020 and, December 31, 2019, respectively	34	33
Additional paid-in capital	243,610	243,180
Accumulated deficit	(215,596)	(214,561)
Total stockholders' equity	28,048	28,653
Total liabilities and stockholders' equity	46,047	47,343
Series C Convertible Preferred Stock [Member]
Stockholders' equity:
Series C Convertible Preferred Stock, $.10 par value, 10,000,000 shares authorized; - and 2,103 shares issued and outstanding at March 31, 2020 and, December 31, 2019, respectively	$ 0	$ 1