Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash	$ 9,924	$ 7,567
Restricted cash	1,775
Notes receivable	5,778
Accounts receivable, net	2,429	2,587
Insurance receivable		95
Inventories, net	4,160	2,403
Income taxes receivable		407
Prepaid expenses and other current assets	1,069	897
Total current assets	25,135	13,956
Property, plant and equipment, net	516	433
Right-of-use assets	2,237	1,504
Notes receivable		5,350
Other assets	39	44
Total assets	27,927	21,287
Current liabilities
Accounts payable and accrued liabilities	4,159	4,027
Deferred revenue	2,423	714
Current maturities of long-term debt		780
Income taxes payable		17
Total current liabilities	6,582	5,538
Long-term debt		633
Other long-term liabilities	1,793	1,257
Total liabilities	8,375	7,428
Commitments and contingencies (note 11)
Stockholders’ equity
Preferred stock, $0.001 par value, 5,000,000 shares authorized; none issued
Common stock, $0.001 par value, 30,000,000 shares authorized; 9,640,545 and 8,726,045 shares issued and outstanding on December 31, 2021 and 2020, respectively	10	9
Additional paid-in capital	31,840	23,981
Accumulated other comprehensive income	14	14
Accumulated deficit	(12,312)	(10,145)
Total stockholders’ equity	19,552	13,859
Total liabilities and stockholders’ equity	$ 27,927	$ 21,287

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.