Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (22,169)	$ (12,819)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	925	831
Stock-based compensation expense	2,504	525
Change in fair value of preferred stock warrant liability		6,142
Change in fair value of commercial services agreement liability-related party		(750)
Noncash interest expense and loss on extinguishment of debt	178	63
Provision for inventory obsolescence	191
Provision for doubtful accounts	1,725	100
Changes in operating assets and liabilities:
Accounts receivable, net	(11,275)	(1,820)
Inventory	(4,481)	223
Prepaid expenses and other current assets	(4,120)	78
Other long-term assets	(476)	(212)
Accounts payable and accrued expenses	2,753	1,980
Deferred revenue	5,426	9,631
Right-of-use operating lease assets	1,121	1,050
Operating lease liabilities	(1,190)	(1,085)
Other long-term liabilities	(194)	194
Net cash provided by (used in) operating activities	(29,082)	4,131
Cash flows from investing activities:
Purchases of property and equipment	(737)	(9)
Net cash used in investing activities	(737)	(9)
Cash flows from financing activities:
Proceeds from public offerings, net of underwriting discounts and commissions	94,752	139,035
Payments of public offering costs	(840)	(1,896)
Proceeds from issuance of common stock upon option exercise	852	53
Proceeds from borrowings on revolving line of credit	30,000
Repayment of borrowings on revolving line of credit	(15,000)
Repayment of notes payable	(15,000)
Payments of debt issuance costs	(39)
Proceeds from Paycheck Protection Program loan		2,202
Repayment of Paycheck Protection Program loan		(2,202)
Net cash provided by financing activities	94,725	137,192
Net increase in cash, cash equivalents and restricted cash	64,906	141,314
Cash, cash equivalents and restricted cash at beginning of period	159,227	17,913
Cash, cash equivalents and restricted cash at end of period	224,133	159,227
Supplemental disclosure of noncash investing and financing information:
Public offering costs included in accounts payable and accrued expenses	112	576
Transfers of inventory to property and equipment	940	346
Accretion of redeemable convertible preferred stock to redemption value		90
Conversion of convertible preferred stock to common stock upon initial public offering		71,107
Reclassification of warrant liability to equity upon initial public offering		6,870
Supplemental disclosure of cash flow information:
Cash paid for interest	$ 366	$ 913