CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 8,129	$ 16,487
Restricted cash	7,500	0
Accounts receivable, net	4,386	3,393
Inventories	3,027	2,794
Prepaid expenses and other current assets	513	536
Total current assets	23,555	23,210
Property and equipment, net	5,369	5,301
Operating lease right-of-use assets	1,314	0
Intangible assets, net	7,955	9,765
Goodwill	8,803	8,803
Other assets	347	428
Total assets	47,343	47,507
Current liabilities:
Note payable	7,275	0
Current portion of long-term debt	0	252
Accounts payable	1,880	1,764
Other accrued liabilities	5,134	4,500
Deferred revenues	2,832	2,099
Current portion of operating lease liabilities	313	0
Total current liabilities	17,434	8,615
Long-term liabilities:
Long-term debt, net	0	7,145
Long-term operating lease liabilities, net	1,078	0
Deferred tax liability	0	111
Other liabilities	178	388
Total liabilities	18,690	16,259
Commitments and contingencies (see Note 11)
Stockholders' equity:
Common Stock, $.001 par value, 150,000,000 shares authorized; 32,932,273 and 29,943,086 shares issued and outstanding as of December 31, 2019 and 2018, respectively	33	30
Additional paid-in capital	243,180	241,988
Accumulated deficit	(214,561)	(210,771)
Total stockholders' equity	28,653	31,248
Total liabilities and stockholders' equity	47,343	47,507
Series C Convertible Preferred Stock [Member]
Stockholders' equity:
Series C Convertible Preferred Stock, $.10 par value, 10,000,000 shares authorized; 2,103 and 9,968 shares issued and outstanding as of December 31, 2019 and 2018, respectively	$ 1	$ 1