CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net loss	$ (72,492)	$ (133,700)	$ (168,723)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, amortization, and impairments	10,342	10,574	5,935
Non-cash interest expense	1,256	0	0
Write-down of inventories	15	21,083	783
Stock-based compensation expense	21,032	27,480	42,531
Change in fair value of warrant liabilities	1,859	(4,544)	(20,859)
Gain on lease termination	0	(214)	0
Other	1,102	633	615
Changes in operating assets and liabilities:
Accounts receivable	(8,503)	(162)	(3,063)
Inventories	2,218	(34,135)	(24,510)
Prepaid expenses and other assets	1,304	2,979	3,819
Vendor advances	(2,498)	17,091	5,100
Accounts payable	(841)	(1,875)	1,216
Deferred revenue	435	2,206	2,266
Accrued purchase commitments	0	(2,015)	(17,383)
Change in operating lease assets and liabilities	(750)	(635)	2,257
Accrued expenses and other liabilities	3,814	(3,586)	901
Net cash used in operating activities	(41,707)	(98,820)	(169,115)
Cash flows from investing activities:
Purchases of marketable securities	0	(297)	(75,534)
Sales of marketable securities	0	76,484	0
Purchases of property, equipment, and intangible assets, including capitalized software	(2,694)	(5,783)	(18,302)
Sales of property and equipment	36	10	57
Net cash provided by (used in) investing activities	(2,658)	70,414	(93,779)
Cash flows from financing activities:
Proceeds from exercise of stock options and warrants	64	228	2,982
Proceeds from employee stock purchase plan	495	0	0
Payments to tax authorities for restricted stock units withheld	(739)	0	(101)
Payments on technology license commitment	(1,315)	0	0
Net cash provided by (used in) financing activities	(1,495)	228	2,881
Net decrease in cash, cash equivalents, and restricted cash	(45,860)	(28,178)	(260,013)
Cash, cash equivalents, and restricted cash, beginning of period	138,650	166,828	426,841
Cash, cash equivalents, and restricted cash, end of period	92,790	138,650	166,828
Supplementary disclosure of non-cash investing and financing activities
Acquisition of property, equipment, and intangible assets, including capitalized software	$ 470	$ 9,247	$ 4,501