CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 10,604	$ 8,129
Restricted cash	7,508	7,500
Accounts receivable, net	2,944	4,386
Inventories	3,444	3,027
Prepaid expenses and other current assets	331	513
Total current assets	24,831	23,555
Property and equipment, net	5,529	5,369
Operating lease right-of-use assets	988	1,314
Intangible assets, net	6,345	7,955
Goodwill	8,803	8,803
Other assets	282	347
Total assets	46,778	47,343
Current liabilities:
Note payable	7,275	7,275
Current portion of long-term debt	1,478	0
Accounts payable	2,764	1,880
Other accrued liabilities	4,690	5,134
Deferred revenues	2,262	2,832
Current portion of operating lease liabilities	369	313
Total current liabilities	18,838	17,434
Long-term liabilities:
Long-term debt, net	1,050	0
Long-term operating lease liabilities, net	710	1,078
Deferred tax liability	254	0
Other liabilities	34	178
Total liabilities	20,886	18,690
Commitments and contingencies (see Note 11)
Stockholders' equity:
Series C Convertible Preferred Stock, $.10 par value, 10,000,000 shares authorized; 0 and 2,103 shares issued and outstanding as of December 31, 2020 and 2019, respectively	0	1
Common Stock, $.001 par value, 150,000,000 shares authorized; 33,801,045 and 32,932,273 shares issued and outstanding as of December 31, 2020 and 2019, respectively	34	33
Additional paid-in capital	244,831	243,180
Accumulated deficit	(218,973)	(214,561)
Total stockholders' equity	25,892	28,653
Total liabilities and stockholders' equity	$ 46,778	$ 47,343