Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Activities:
Net (loss) income	$ (48,688,000)	$ 27,575,000
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	3,975,000	3,853,000
Amortization of right-of-use lease assets	13,000	159,000
Amortization of debt issuance costs and premium	493,000	85,000
Change in fair value of warrants	(2,717,000)	(63,011,000)
Gain on expiration of warrant	(5,018,000)	0
Amortization of discount on short-term investments	(30,000)	(446,000)
Stock-based compensation	7,575,000	4,185,000
Gain on sale of equipment	0	7,000
Provision for excess and obsolete inventory	2,367,000	238,000
Change in operating assets and liabilities:
Accounts receivable	(1,996,000)	(2,076,000)
Inventories	(2,111,000)	(1,307,000)
Prepaid and other assets	(2,809,000)	180,000
Accounts payable	555,000	(954,000)
Accrued expenses and other liabilities	3,683,000	(3,691,000)
Net cash used in operating activities	(44,708,000)	(35,203,000)
Investing Activities:
Purchases of property and equipment	(1,940,000)	(2,539,000)
Proceeds from sale of equipment	0	3,000
Maturity of short-term investments	80,000,000	116,000,000
Purchase of short-term investments	(159,967,000)	(97,873,000)
Net cash (used in) provided by investing activities	(81,907,000)	15,591,000
Financing Activities:
Proceeds from term loan	15,000,000	25,000,000
Payments of debt issuance costs	(132,000)	(687,000)
Proceeds from exercise of warrants	790,000	23,000
Proceeds from initial public offering	119,582,000	0
Principal payments on finance lease liabilities	(27,000)	(142,000)
Change in notes receivables for redeemable common stock issued	575,000	51,000
Proceeds from exercise of stock options	1,554,000	992,000
Net cash provided by financing activities	137,342,000	25,237,000
Effect of foreign exchange rate on cash, cash equivalents and restricted cash	(10,000)	0
Net increase in cash, cash equivalents and restricted cash	10,717,000	5,625,000
Cash, cash equivalents and restricted cash - beginning of period	14,455,000	8,830,000
Cash, cash equivalents and restricted cash - end of period	25,172,000	14,455,000
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	1,269,000	987,000
Cash paid for income taxes	20,000	61,000
Cash paid for interest on financing leases	5,000	14,000
Cash paid for interest on term loan	3,182,000	411,000
Right-of-use assets obtained in exchange for lease obligations:
Operating lease	126,000	1,953,000
Finance lease		48,000
Lease obligations recorded for right-of-use assets:
Operating lease	126,000	1,953,000
Finance lease		48,000
Acquisition of property and equipment included in accounts payable and accrued expenses and other current liabilities	30,000	40,000
Accretion to redemption value of redeemable stock and stock options		38,308,000
Payment-in-kind interest income added to principal of notes receivable	28,000	54,000
Reclassification from warrant liability to additional paid-in capital for warrants exercised	1,111,000	24,000
Reclassification of 4,093,995 shares of redeemable common stock to 4,093,995 shares of common stock	87,702,000
Reclassification of redeemable common stock options to common stock options	47,370,000
Conversion of preferred stock to common stock upon initial public offering	357,202,000
Reclassification of deferred financing costs	$ 3,156,000