CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 10,043	$ 10,604
Restricted cash	7,482	7,508
Accounts receivable, net of allowance for doubtful accounts of $220 and $274, respectively	2,853	2,944
Inventories	3,312	3,444
Prepaid expenses and other current assets	413	331
Total current assets	24,103	24,831
Property and equipment, net	5,788	5,529
Operating lease right-of-use assets, net	902	988
Intangible assets, net	5,993	6,345
Goodwill	8,803	8,803
Other assets	265	282
Total assets	45,854	46,778
Current liabilities:
Note payable	7,275	7,275
Current portion of long-term debt	1,811	1,478
Accounts payable	3,151	2,764
Other accrued liabilities	5,286	4,690
Current portion of operating lease liabilities	375	369
Deferred revenues	2,208	2,262
Total current liabilities	20,106	18,838
Long-term liabilities:
Long-term debt, net	717	1,050
Deferred tax liability	258	254
Long-term operating lease liabilities, net	613	710
Other liabilities	24	34
Total liabilities	21,718	20,886
Commitments and contingencies (see Note 15)
Stockholders' equity:
Series C Convertible Preferred Stock, $.10 par value, 10,000,000 shares authorized; 0 shares issued and outstanding at March 31, 2021 and, December 31, 2020	0	0
Common Stock, $.001 par value, 150,000,000 shares authorized; 33,817,305 and 33,801,045 shares issued and outstanding at March 31, 2021 and, December 31, 2020, respectively	34	34
Additional paid-in capital	245,493	244,831
Accumulated deficit	(221,391)	(218,973)
Total stockholders' equity	24,136	25,892
Total liabilities and stockholders' equity	$ 45,854	$ 46,778