Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (174,766)	$ (38,407)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	6,208	6,342
Reduction in carrying amount of ROU assets	2,288	0
Write-off of deferred IPO costs	0	3,548
Stock-based compensation	81,370	241
Gain on sale of assets held-for-sale	0	(7,529)
Provision for doubtful accounts	2,070	525
Gain from forgiveness of PPP loan	(10,124)	0
Accretion on short-term investments	1,075	0
Other	(27)	74
Changes in operating assets and liabilities:
Accounts receivable, net	2,072	(8,067)
Inventories, net	6,273	3,329
Prepaid and other current assets	2,882	2,510
Contract assets	(2,209)	(8,439)
Other assets	67	358
Accounts payable	(3,352)	3,188
Accrued expenses and other liabilities	(2,323)	(9,812)
Contract liabilities	(1,740)	2,512
Net cash used in operating activities	(90,236)	(49,627)
Cash flows from investing activities:
Purchase of property, plant and equipment	(3,213)	(2,197)
Proceeds from sale of assets held-for-sale	0	12,275
Proceeds from sales of short-term investments	12,207	0
Proceeds from maturities of short-term investments	115,223	2,200
Purchase of short-term investments	(249,957)	0
Investment in notes receivable	(750)	0
Net cash provided by (used in) investing activities	(126,490)	12,278
Cash flows from financing activities:
Proceeds from issuance of preferred stock, net of issuance costs	0	19,919
Payment of transaction costs related to Business Combination	(20,005)	248,303
Repurchase of common stock	0	(1,801)
Proceeds from warrant exercises, net of issuance costs of $52	89,270	0
Tax withholding payment for vested equity awards	(37)	0
Cash paid for IPO costs	0	(1,144)
Proceeds from notes payable	0	10,000
Net cash provided by financing activities	69,228	275,277
Effect of exchange rate fluctuations on cash and cash equivalents	(6)	(79)
Net increase (decrease) in cash and cash equivalents	(147,504)	237,849
Beginning cash and cash equivalents	204,648	60,004
Ending cash and cash equivalents	57,144	297,853
Supplemental disclosures of cash flow information:
Cash paid for interest	83	69
Cash paid for (received from) income taxes, net	721	(7,806)
Cash paid for operating leases	3,382	0
Supplemental disclosure of noncash investing and financing activities:
Changes in accrued purchases of property, plant and equipment	2	237
ROU assets obtained in exchange for new operating lease liabilities	498	0
Receipt of equity shares from customer in satisfaction of accounts receivable	297	0
Accounts Payable
Supplemental disclosure of noncash investing and financing activities:
Transaction costs	0	339
Accrued Liabilities
Supplemental disclosure of noncash investing and financing activities:
Transaction costs	$ 5,000	$ 18,733