CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (37,467)	$ (62,211)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, amortization, and impairments	5,217	4,305
Non-cash interest expense	607
Write-down of inventories	(81)
Stock-based compensation expense	11,383	14,109
Change in fair value of warrant liabilities	(413)	(413)
Other	462	(651)
Changes in operating assets and liabilities:
Accounts receivable	(3,165)	(3,293)
Inventories	(1,072)	(26,855)
Prepaid expenses and other assets	165	(615)
Vendor advances	(1,396)	9,534
Accounts payable	(587)	1,390
Deferred revenue	(908)	(1,062)
Accrued purchase commitments		(1,615)
Change in operating lease assets and liabilities	(348)	196
Accrued expenses and other liabilities	(3,064)	(2,557)
Net cash used in operating activities	(30,667)	(69,738)
Cash flows from investing activities:
Purchases of marketable securities		(297)
Sales of marketable securities		76,484
Purchases of property, equipment, and intangible assets, including capitalized software	(1,872)	(2,223)
Sales of property and equipment	35	10
Net cash (used in) provided by investing activities	(1,837)	73,974
Cash flows from financing activities:
Proceeds from exercise of stock options and warrants		136
Net cash provided by financing activities		136
Net (decrease) increase in cash, cash equivalents, and restricted cash	(32,504)	4,372
Cash, cash equivalents, and restricted cash, beginning of period	138,650	166,828
Cash, cash equivalents, and restricted cash, end of period	$ 106,146	$ 171,200