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	$ (164,093)	$ (72,227)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,240	1,929
Noncash lease expense related to operating lease right-of-use assets	2,682
Change in fair value of warrants	22,649	12,562
Share-based compensation—vendor payments	2,744	0
Impairment of inventories	1,601	4,393
Loss on extinguishment of debt	0	866
Share-based compensation	49,887	4,710
Warranty related to sensors	1,239	0
Deferred taxes	(1,264)	0
Other	883	389
Changes in operating assets and liabilities:
Cash received from acquisition of Optogration, Inc.	358	0
Accounts receivable	5,748	723
Inventories	(6,658)	(3,206)
Prepaid expenses and other current assets	(16,971)	(3,571)
Other non-current assets	(88)	544
Accounts payable	3,330	2,462
Accrued and other current liabilities	5,910	2,885
Other non-current liabilities	(4,095)	(190)
Net cash used in operating activities	(94,256)	(47,731)
Cash flows from investing activities:
Purchases of marketable securities	(530,179)	(123,403)
Proceeds from maturities of marketable securities	306,907	8,465
Proceeds from sales of marketable securities	83,493	4,448
Purchases of property and equipment	(4,155)	(1,963)
Net cash used in investing activities	(143,576)	(112,453)
Cash flows from financing activities:
Proceeds from issuance of Series X convertible preferred stock	0	170,000
Issuance cost paid for Series X convertible preferred stock	0	(5,662)
Proceeds from the issuance of debt	0	31,910
Repayment of debt	(159)	(11,206)
Proceeds from exercise of warrants	153,927	0
Proceeds from exercise of stock options	4,738	0
Other financing activities	(345)	(1,238)
Net cash provided by financing activities	158,161	183,804
Net increase (decrease) in cash, cash equivalents and restricted cash	(79,671)	23,620
Beginning cash, cash equivalents and restricted cash	209,719	27,305
Ending cash, cash equivalents and restricted cash	130,048	50,925
Supplemental disclosures of cash flow information:
Cash paid for interest	53	2,013
Supplemental disclosures of noncash investing and financing activities:
Issuance of Class A common stock upon exercise of warrants	338,293	0
Operating lease right-of-use assets obtained in exchange for lease obligations	$ 2,876	0
Accounting Standards Update [Extensible List]	Upon adoption of ASC 842
Assets acquired under finance leases (capital lease prior to adoption of ASC 842)	$ 0	43
Purchases of property and equipment recorded in accounts payable and accrued liabilities	543	313
Merger related expense recorded in accounts payable and accrued liabilities	0	3,669
Issuance of convertible preferred stock for cash	0	227
Upon adoption of ASC 842
Supplemental disclosures of noncash investing and financing activities:
Operating lease right-of-use assets obtained in exchange for lease obligations	$ 10,849	$ 0