CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 15,035	$ 4,538
Restricted cash	385	278
Investments	1,182	713
Accounts receivable, net of allowances of $1.2 million and $0.8 million, respectively	15,910	15,811
Inventories, net	10,287	8,525
Other current assets	1,977	1,998
Total current assets	44,776	31,863
Property and equipment, net	8,853	8,918
Operating lease right-of-use assets, net	5,346	4,494
Intangible assets, net	14,642	15,072
Goodwill	6,046	6,046
Other assets	1,528	1,659
Total assets	81,191	68,052
Current liabilities:
Accounts payable	5,196	4,277
Accrued liabilities	3,608	2,445
Accrued compensation	3,192	3,051
Accrued warranty	420	569
Billings in excess of costs and estimated profit	15	312
Deferred revenue	2,975	2,457
Short-term debt	13,334	12,869
Operating lease liabilities	1,422	1,253
Finance lease liabilities	559	588
Total current liabilities	30,721	27,821
Deferred tax liabilities	998	72
Operating lease liabilities, net of current portion	3,996	3,299
Finance lease liabilities, net of current portion	639	706
Other liabilities	386	412
Total liabilities	36,740	32,310
Commitments and contingencies
Stockholders’ Equity:
Common stock, $0.0001 par value: 30,000,000 shares authorized; 15,029,410 and 5,805,916 shares issued and outstanding (net of treasury shares) at March 31, 2022 and December 31, 2021, respectively	1	0
Treasury stock, at cost; 258,849 shares at March 31, 2022 and December 31, 2021, respectively	(5,728)	(5,728)
Additional paid-in capital	162,860	150,451
Accumulated deficit	(131,670)	(127,969)
Total stockholders’ equity	25,463	16,754
Total liabilities, mezzanine equity and stockholders’ equity	81,191	68,052
Series A Preferred Stock
Stockholders’ Equity:
Preferred stock	18,988	18,988
Series C Preferred Stock
Stockholders’ Equity:
Preferred stock	$ 0	$ 0