Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (53,992)	$ (29,456)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation	3,957	3,902
Stock-based compensation	16,085	5,066
Change in operating lease right-of-use assets	1,602	1,288
Non-cash interest and other (income) expense related to debt and note receivable agreements	51	51
Provision for excess and obsolete inventory	431	41
Loss on disposal and impairment of property and equipment	61	135
Changes in operating assets and liabilities:
Trade accounts receivable	(11,773)	(3,368)
Inventory	(5,121)	(5,847)
Prepaid expenses, other current assets and other assets	(3,345)	(707)
Trade accounts payable	8,096	664
Deferred revenue	5,910	(5,273)
Accrued expenses and other current liabilities	806	1,843
Operating lease liabilities	(1,478)	(1,332)
Net cash used in operating activities	(38,710)	(32,993)
Cash flows from investing activities:
Purchase of property and equipment	(10,715)	(1,821)
Net cash used in investing activities	(10,715)	(1,821)
Cash flows from financing activities:
Proceeds from issuance of common stock upon initial public offering, net	0	190,585
Payment of issuance costs	0	(2,650)
Payment of debt issuance costs	(300)	0
Proceeds from issuance of common stock upon exercise of stock options	9,674	3,079
Proceeds from issuance of common stock under employee stock purchase plan	3,644	0
Net cash provided by financing activities	13,018	191,014
Net decrease in cash and cash equivalents and restricted cash	(36,407)	156,200
Cash and cash equivalents and restricted cash at beginning of period	233,678	81,303
Cash and cash equivalents and restricted cash at end of period	$ 197,271	$ 237,503