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	$ (5,968)	$ (4,905)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	225	227
Provision for inventory obsolescence	85	0
Loss on disposal of property and equipment	26	0
Stock based compensation	1,650	1,194
Provision for allowance for doubtful accounts	140	6
Changes in operating assets and liabilities:
Trade receivables	475	680
Prepaid expenses and other assets	649	312
Inventories	(371)	(372)
Accounts payable	(51)	782
Accrued and other liabilities	(1,378)	24
Net cash used in operating activities	(4,518)	(2,052)
Cash flows from investing activities
Purchases of property and equipment	(279)	(192)
Net cash used in investing activities	(279)	(192)
Cash flows from financing activities
Proceeds from stock option exercises	152	21
Repayment of finance lease liabilities	(54)	(82)
Net cash provided by (used in) financing activities	98	(61)
Effect of exchange rates on cash	63	(71)
Net change in cash and cash equivalents	(4,636)	(2,376)
Cash and cash equivalents, beginning of period	30,870	41,915
Cash and cash equivalents, end of period	26,234	39,539
Cash paid for:
Interest	8	4
Income taxes	$ 0	$ 0