Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows From Operating Activities:
Net loss	$ (10,925)	$ (14,948)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of debt discount and debt issuance costs	61	1,056
Non-cash interest expense from long-term debt and convertible notes		1,913
Depreciation and amortization	2,668	2,643
Non-cash lease expense	153
Stock-based compensation expense	1,523	131
Change in fair value of redeemable convertible preferred stock warrant liability		582
Change in fair value of contingent consideration liability	(151)	(204)
Change in fair value of derivative liabilities		6,121
Property and equipment impairments	10
Net changes in operating assets and liabilities, net of acquired businesses:
Accounts receivable, net	142	910
Inventory	(1,127)	(2,755)
Prepaid expenses and other current assets	997	(187)
Accounts payable	(550)	1,850
Accrued liabilities	402	556
Accrued compensation	(631)	(589)
Operating lease liability	(197)
Net cash used in operating activities	(7,625)	(2,921)
Cash Flows From Investing Activities:
Purchase of property and equipment	(82)	(401)
Net cash used in investing activities	(82)	(401)
Cash Flows From Financing Activities:
Proceeds from issuance of common stock	3	886
Payment of contingent consideration	(5,000)
Net cash (used in) provided by financing activities	(4,997)	886
Net decrease in cash, cash equivalents and restricted cash	(12,704)	(2,436)
Cash, cash equivalents and restricted cash at the beginning of the period	48,415	25,166
Cash, cash equivalents and restricted cash at the end of the period	35,711	22,730
Reconciliation of cash, cash equivalents and restricted cash to balance sheets
Cash and cash equivalents	27,904	14,923
Restricted cash	7,807	7,807
Cash, cash equivalents and restricted cash in balance sheets	35,711	22,730
Supplemental Disclosure of Cash Flow Information:
Cash paid for interest	568	458
Supplemental Disclosure of Non-cash Items:
Vesting of early exercised stock options	39
Purchases of property and equipment included in accounts payable	18	44
Net reclassification of inventory to property and equipment for customer usage agreements	805	$ 747
Right of use asset acquired under operating lease on the adoption of ASC 842	$ 894