Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 10,923	$ 12,586
Accounts receivable, net of allowance for doubtful accounts of $288 and $275 at March 31, 2022 and December 31, 2021, respectively	2,972	3,433
Inventories	4,758	3,489
Prepaid expenses and other current assets	393	462
Total current assets	19,046	19,970
Property and equipment, net	6,921	6,883
Operating lease right-of-use assets	549	638
Intangible assets, net	19,568	10,083
Goodwill	8,803	8,803
Other assets	200	216
Total assets	55,087	46,593
Current liabilities:
Accounts payable	3,970	2,822
Accrued expenses and other current liabilities	6,539	6,377
Deferred revenues	3,121	3,285
Current portion of operating lease liabilities	289	318
Current portion of contingent consideration	500	0
Total current liabilities	14,419	12,802
Long-term debt	7,356	7,319
Deferred revenues and other liabilities	320	400
Deferred tax liability	266	266
Operating lease liability, net of current portion	324	392
Contingent consideration, net of current portion	8,622	0
Total liabilities	31,307	21,179
Commitments and contingencies (Note 14)
Stockholders' equity:
Series C convertible preferred stock, $0.10 par value; 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value, 150,000,000 shares authorized; 34,723,046, and 34,364,679, shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	35	34
Additional paid-in capital	247,926	247,059
Accumulated deficit	(224,181)	(221,679)
Total stockholders' equity	23,780	25,414
Total liabilities and stockholders' equity	$ 55,087	$ 46,593