Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows From Operating Activities
Net loss	$ (7,740)	$ (7,381)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of leasehold improvements and equipment	201	221
Amortization of intangibles	49	60
Amortization of right of use assets	299	126
Share-based compensation expense	1,888	1,284
Provision for doubtful trade receivables	10	14
Non-cash financing costs	18	28
Changes in operating assets and liabilities:
Trade receivables	(1,094)	(1,967)
Inventories	(1,706)	(1,079)
Implementation costs for cloud computing arrangement	(114)	(28)
Prepaid expenses and other assets	46	74
Accounts payable	(643)	2,248
Accrued expenses	1,645	1,196
Customer deposits and other	(18)	(47)
Operating lease liabilities	(39)	(154)
Net cash used in operating activities	(7,198)	(5,405)
Cash Flows From Investing Activities
Purchases of leasehold improvements and equipment	(25)	(46)
Net cash used in investing activities	(25)	(46)
Cash Flows From Financing Activities
Proceeds from issuance of common stock, net	0	24,871
Proceeds from exercise of stock options	0	8,633
Payment of debt issuance costs	0	(44)
Principal payments on finance leases	(3)	(15)
Net cash (used in) provided by financing activities	(3)	33,445
Net (decrease) increase in cash	(7,226)	27,994
Cash, including restricted cash of $0.2 million for both periods - beginning of period	28,219	16,697
Cash, including restricted cash of $0.2 million for both periods - end of period	20,993	44,691
Supplemental Disclosures of Cash Flow Information
Cash payments for interest on finance leases	0	1
Cash payments for principal on operating lease liabilities	$ 58	$ 154