Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets
Cash, including restricted cash of $0.2 million as of both dates	$ 20,993	$ 28,219
Trade receivables, net of allowances of $54 and $65, respectively; Including receivables from Related Party of: $2.3 million and $2.1 million, respectively.	6,310	5,226
Inventories	15,307	13,601
Prepaid expenses and other assets	1,913	1,859
Total current assets	44,523	48,905
Leasehold improvements and equipment, net	2,940	3,003
Intangible assets, net	808	857
Right-of-use assets	4,053	4,352
Other long-term assets	606	723
Total assets	52,930	57,840
Current liabilities
Accounts payable	9,780	10,423
Accrued expenses	8,126	6,481
Current maturities of operating lease obligations	630	528
Current maturities of finance lease obligations	17	20
Customer deposits	141	161
Total current liabilities	18,694	17,613
Deferred revenue	4,346	4,346
Operating lease obligations, less current maturities	4,013	4,154
Total liabilities	27,053	26,113
Commitments and Contingencies (Note 10)
Stockholders' Equity
Common stock, $0.001 par value; authorized 150,000 shares; 68,149 shares and 68,126 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively.	68	68
Additional paid-in capital	202,502	200,614
Accumulated deficit	(176,693)	(168,953)
Cumulative translation adjustments	0	(2)
Total stockholders' equity	25,877	31,727
Total liabilities and stockholders' equity	$ 52,930	$ 57,840