Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net loss	$ (15,586)	$ (6,961)
Adjustments to reconcile net loss to net cash, cash equivalents, and restricted cash used in operating activities
Depreciation and amortization	908	746
Amortization of lease right-of-use assets	280
Loss on debt extinguishment		728
Stock‑based compensation expense	1,346	1,752
Change in contingent consideration		983
Provision for doubtful accounts	(39)	193
Accrued interest, amortization of debt issuance costs and other	1,006	65
Inventory excess and obsolescence	379
Impairment loss on intangible assets	81
Changes in operating assets and liabilities:
Accounts receivable	(78)	(3,256)
Other current assets	(166)	1,068
Other long-term assets	466	224
Accounts payable and other accrued liabilities	(1,304)	(5,744)
Deferred revenue	(124)	(1,124)
Current and long-term operating lease liabilities	(268)
Net cash and cash equivalents and restricted cash used in operating activities	(13,099)	(11,326)
Cash flows from investing activities
Purchases of property and equipment	(262)	(466)
Patent costs and intangible asset acquisition, net	(90)	(50)
Net cash and cash equivalents and restricted cash used in investing activities	(352)	(516)
Cash flows from financing activities
Proceeds from the issuance of common stock	1,599
Proceeds from issuance of common stock under employee stock purchase plan	202
Proceeds from exercise of stock options	75	475
Payment of contingent consideration	(4,625)
Proceeds from term loan and notes payable	103	30,000
Repayment of term loan and notes payable	(11)	(25,416)
Equity financing costs	(141)
Deferred offering costs	(30)
Payment of debt issuance costs		(108)
Other	(6)
Net cash and cash equivalents and restricted cash (used in) provided by financing activities	(2,834)	4,951
Net decrease in cash and cash equivalents and restricted cash	(16,285)	(6,891)
Cash, cash equivalents, and restricted cash ‑ beginning of period	32,798	62,306
Cash, cash equivalents, and restricted cash ‑ end of period	16,513	55,415
Supplemental cash flow information:
Common stock issued for deferred offering costs	600
Deferred offering costs amortized against Additional paid-in capital	18
Deferred offering costs included in Accrued liabilities	85
Equity financing costs included in Accrued liabilities	24
Operating lease right-of-use assets obtained in exchange for lease liabilities	2,497
Finance lease right-of-use assets obtained in exchange for lease liabilities	123
Cash paid for interest	$ 223	$ 577