Statement of Cash Flows (Statement) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net loss	$ (98,368)	$ (51,619)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	15,322	13,294
Stock-based compensation	76,002	43,749
Non-cash charitable contribution	7,757	0
Change in operating assets and liabilities:
Accounts receivable, net	(221)	671
Inventory	(12,971)	(5,698)
Prepaid expenses and other assets	(775)	(2,117)
Other non-current assets	(548)	(13)
Accounts payable	7,629	1,899
Accrued expenses	11,724	11,174
Deferred revenue	(9,774)	(3,096)
Other current liabilities	578	764
Deferred rent	2,980	1,471
Other liabilities	530	2,907
Net cash (used in) provided by operating activities	(135)	13,386
Cash flows from investing activities
Purchases of property and equipment	(34,018)	(14,748)
Net cash used in investing activities	(34,018)	(14,748)
Cash flows from financing activities
Proceeds from stock option and warrant exercises	10,087	966
Employee tax withholding remitted in connection with exercise or release of equity awards	(29,059)	0
Proceeds from repayment of related party loans	31,513	945
Stock repurchases	(8,085)	0
Payment for Tender Offer	(18,031)	0
Borrowings from Credit Facility	0	30,900
Repayment of Credit Facility	0	(30,900)
Net cash (used in) provided by financing activities	(13,575)	245,597
Effect of exchange rates on cash	(120)	(263)
Net (decrease) increase in cash and cash equivalents	(47,848)	243,972
Beginning of year	314,085	55,424
End of year	266,237	299,396
Supplemental disclosures
Cash paid for income taxes	314	220
Cash paid for interest	94	438
Non-cash investing and financing activities:
Purchases of property and equipment included in accounts payable and accrued expenses	5,246	2,623
Related party loans issued in connection with stock option exercises	13,827	0
Series F Preferred
Cash flows from financing activities
Issuance of Series F redeemable convertible preferred stock, net of issuance costs	0	124,717
Series G Preferred
Cash flows from financing activities
Issuance of Series F redeemable convertible preferred stock, net of issuance costs	$ 0	$ 118,969