CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net loss	$ (13,433)	$ (9,544)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	1,110	670
Amortization of intangible assets	596	622
Non-cash operating lease cost	260	258
Provision for expected credit losses	125	5
Write-down of inventory		4
Loss on disposal of property and equipment		120
Stock-based compensation expense	3,244	3,750
Changes in operating assets and liabilities:
Accounts receivable	1,871	(691)
Prepaid and other current assets	470	423
Inventories	(818)	(840)
Accounts payable	1,497	326
Accrued liabilities	(232)	(1,236)
Other	(87)	52
Net cash used in operating activities	(5,397)	(6,081)
Cash flows from investing activities
Purchase of property and equipment	(56)	(134)
Net cash used in investing activities	(56)	(134)
Cash flows from financing activities
Payment of contingent consideration	(1,200)
Proceeds from issuance of common stock under employee stock purchase plan	212	170
Net cash (used in) provided by financing activities	(988)	170
Net decrease in cash and cash equivalents	(6,441)	(6,045)
Cash and cash equivalents at beginning of the period	31,637	40,599
Cash and cash equivalents at end of the period	25,196	34,554
Supplemental cash flow information
Cash paid for taxes	10	19
Supplemental schedule of non-cash investing and financing activities
Transfer from Inventories to Equipment under lease, net	1,416	1,860
Transfer from Inventories to Property and equipment, net	$ 34
Accounts payable for purchases of Property and equipment		$ 51