CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 15,941	$ 16,487
Accounts receivable, net of allowance for doubtful accounts of $143 and $141, respectively	3,476	3,393
Inventories	3,607	2,794
Prepaid expenses and other current assets	630	536
Total current assets	23,654	23,210
Property and equipment, net	4,789	5,301
Operating lease right-of-use assets, net	1,485	0
Intangible assets, net	8,860	9,765
Goodwill	8,803	8,803
Other assets	376	428
Total assets	47,967	47,507
Current liabilities:
Current portion of long-term debt	1,767	252
Accounts payable	2,091	1,764
Other accrued liabilities	4,748	4,500
Current portion of operating lease liabilities	239	0
Deferred revenues	2,292	2,099
Total current liabilities	11,137	8,615
Long-term liabilities:
Long-term debt, net	5,699	7,145
Deferred tax liability	22	111
Long-term operating lease liabilities, net	1,267	0
Other liabilities	383	388
Total liabilities	18,508	16,259
Commitments and contingencies (see Note 15)
Stockholders' equity:
Common Stock, $.001 par value, 150,000,000 shares authorized; 32,903,287 and 29,943,086 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	33	30
Additional paid-in capital	242,611	241,988
Accumulated deficit	(213,186)	(210,771)
Total stockholders' equity	29,459	31,248
Total liabilities and stockholders' equity	47,967	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 at June 30, 2019 and December 31, 2018, respectively	$ 1	$ 1