CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 16,487	$ 4,069
Accounts receivable, net	3,393	3,141
Inventories	2,794	3,009
Prepaid expenses and other current assets	536	533
Total current assets	23,210	10,752
Property and equipment, net	5,301	7,703
Intangible assets, net	9,765	11,825
Goodwill	8,803	8,803
Other assets	428	48
Total assets	47,507	39,131
Current liabilities:
Note payable	0	357
Current portion of long-term debt	252	2,387
Accounts payable	1,764	2,277
Other accrued liabilities	4,500	3,581
Deferred revenues	2,099	1,871
Total current liabilities	8,615	10,473
Long-term liabilities:
Long-term debt, net	7,145	7,853
Warranty liability	0	67
Deferred tax liability	111	414
Other liabilities	388	444
Total liabilities	16,259	19,251
Commitments and contingencies (see Note 12)
Stockholders' equity:
Common Stock, $.001 par value, 150,000,000 shares authorized; 29,943,086 and 4,304,425 shares issued and outstanding as of December 31, 2018 and 2017, respectively	30	4
Additional paid-in capital	241,988	223,829
Accumulated deficit	(210,771)	(203,957)
Total stockholders' equity	31,248	19,880
Total liabilities and stockholders' equity	47,507	39,131
Series C Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred stock - Convertible Preferred Stock	$ 1	$ 4