CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (108,161)	$ 10,361	$ (22,156)	$ (5,380)	$ (84,812)	$ (34,528)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization					2,397	1,984
Inventory impairment charges	13		163		78	485
Share-based compensation					14,185	0
Amortization of discount and cost of issuance of debt					198	149
Bad debts					125	74
Non-cash interest expense					0	327
(Gain) loss from change in fair value remeasurement of SAFEs	0		18,520		(21,600)	20,735
(Gain) loss from change in fair value of warrants	40,401		0		29,085	0
(Gain) loss from change in fair value of derivatives	45,516		0		27,677	0
(Gain) loss from extinguishment of debt	0		0		(304)	0
Deferred City Semi compensation					375	278
Changes in operating assets and liabilities:
Accounts receivable					(3,047)	(471)
Inventory					(2,730)	350
Accounts payable					625	(1,755)
Accrued expenses and other current liabilities					2,814	37
Deferred revenue					(1,113)	(2,139)
Prepaid and other current assets					(2,848)	0
Other long-term liabilities					782	(53)
Net cash used in operating activities					(36,913)	(14,527)
Cash flows from investing activities:
Purchases of property and equipment					(1,668)	(625)
Accrual for purchases of intangible assets					(784)	0
Payments for acquired software license					0	(113)
Business combination, net of cash					0	(38)
Net cash used in investing activities					(2,452)	(776)
Cash flows from financing activities:
Proceeds from issuance of SAFEs					5,000	15,250
Proceeds from sale of noncontrolling interest					0	1,452
Proceeds from issuance of debt obligations					155	4,973
Proceeds from reverse recapitalization					377,663	0
Issuance costs related to reverse recapitalization					(19,902)	0
Payments on debt obligations					(15,008)	(4,183)
Payments on financed software					(2,270)	(400)
Redemption of Class H units					(900)	0
Settlement of City Semi first tranche contingent consideration					(399)	0
Net cash provided by financing activities					344,339	17,092
Effect of exchange rate changes on cash and cash equivalents					193	21
Net increase in cash and cash equivalents					305,167	1,810
Cash and cash equivalents at beginning of period		$ 18,698		$ 7,155	18,698	7,155	$ 7,155
Cash and cash equivalents at end of period	$ 323,865		$ 8,965		323,865	8,965	$ 18,698
Supplemental disclosure of cash flow information:
Interest paid					1,188	1,121
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property and equipment, accrued but not paid					206	3
Conversion of historical members' equity					41,278	0
Class G warrants cashless exchange					407	0
Conversion of SAFEs					86,100	0
Conversion of Embry Notes					4,119	0
Recognition of earn-out considerations					119,759	0
Recognition of warrant liabilities					74,408	0
Accrual for purchases of intangible assets					12,198	64
Earnout shares
Adjustments to reconcile net loss to net cash used in operating activities:
(Gain) loss from change in fair value of derivatives					27,677	0
Currency forward contract
Adjustments to reconcile net loss to net cash used in operating activities:
(Gain) loss from change in fair value of derivatives					$ 1,200	$ 0