CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 13,047	$ 10,604
Restricted cash	0	7,508
Accounts receivable, net of allowance for doubtful accounts of $248 and $274, respectively	3,151	2,944
Inventories	3,225	3,444
Prepaid expenses and other current assets	623	331
Total current assets	20,046	24,831
Property and equipment, net	6,403	5,529
Operating lease right-of-use assets, net	727	988
Intangible assets, net	10,546	6,345
Goodwill	8,803	8,803
Other assets	233	282
Total assets	46,758	46,778
Current liabilities:
Note payable	0	7,275
Current portion of long-term debt	0	1,478
Accounts payable	2,480	2,764
Other accrued liabilities	5,548	4,690
Current portion of operating lease liabilities	359	369
Deferred revenues	3,767	2,262
Total current liabilities	12,154	18,838
Long-term liabilities:
Long-term debt, net	7,282	1,050
Deferred tax liability	266	254
Long-term operating lease liabilities, net	445	710
Other liabilities	428	34
Total liabilities	20,575	20,886
Commitments and contingencies (see Note 15)
Stockholders' equity:
Series C Convertible Preferred Stock, $0.10 par value, 10,000,000 shares authorized; 0 shares issued and outstanding at September 30, 2021 and, December 31, 2020	0	0
Common Stock, $0.001 par value, 150,000,000 shares authorized; 34,364,679, and 33,801,045 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	34	34
Additional paid-in capital	246,979	244,831
Accumulated deficit	(220,830)	(218,973)
Total stockholders' equity	26,183	25,892
Total liabilities and stockholders' equity	$ 46,758	$ 46,778