Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net loss	$ (34,328)	$ (20,282)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,025	1,944
Amortization of right-of-use lease assets	56	15
Amortization of debt issuance costs and premium	265	229
Change in fair value of warrants	0	(1,214)
Gain on expiration of warrant	0	(5,018)
Amortization of discount on short-term investments	(231)	(15)
Stock-based compensation	5,553	2,645
Provision for excess and obsolete inventory	120	1,749
Change in operating assets and liabilities:
Accounts receivable	(2,022)	(1,071)
Inventories	(3,710)	(2,004)
Prepaid and other assets	1,099	(1,250)
Accounts payable	1,348	1,195
Accrued expenses and other liabilities	17	846
Net cash used in operating activities	(29,808)	(22,231)
Investing Activities:
Purchases of property and equipment	(1,451)	(1,321)
Maturities of short-term investments	135,000	40,000
Purchases of short-term investments	(104,564)	(4,999)
Net cash provided by investing activities	28,985	33,680
Financing Activities:
Proceeds from term loan		15,000
Payments of debt issuance costs	(142)	(122)
Payments for employee taxes related to stock compensation	(362)
Principal payments on finance lease liabilities	(60)	(16)
Payments of deferred offering costs		(242)
Change in notes receivables for redeemable common stock issued		439
Proceeds from issuance of common stock	1,044	1,332
Net cash (used in) provided by financing activities	480	16,391
Effect of foreign exchange rate on cash, cash equivalents and restricted cash	(14)	(3)
Net (decrease) increase in cash, cash equivalents and restricted cash	(357)	27,837
Cash, cash equivalents and restricted cash - beginning of period	25,172	14,455
Cash, cash equivalents and restricted cash - end of period	24,815	42,292
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	1,023	598
Cash paid for income taxes	3	14
Cash paid for interest on financing leases	3	3
Cash paid for interest on term loan	1,904	1,291
Right-of-use assets obtained in exchange for lease obligations:
Operating lease	1,090
Finance Lease	288
Lease obligations recorded for right-of-use assets:
Operating lease	1,090
Finance Lease	256
Acquisition of property and equipment included in accounts payable and accrued expenses and other current liabilities	$ 238	76
Deferred offering costs included in accrued expenses		(1,233)
Payment-in-kind interest income added to principal of notes receivable		26
Reclassification of 4,093,995 shares of redeemable common stock to 4,093,995 shares of common stock		87,702
Reclassification of redeemable common stock options to common stock options		$ 47,370