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	$ (152,261)	$ (149,333)	$ (147,305)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,480	4,622	3,265
Impairment of inventories	1,140	224	1,664
Fair value at issuance of Series A warrants	0	6,500	0
Change in fair value of warrant liabilities	1,486	182	(970)
Stock-based compensation	23,708	23,675	24,247
Amortization of right-of-use assets	3,463	3,108	2,882
Realized loss on available-for-sale securities	0	0	29
Amortization of premium and accretion of discount on available-for-sale securities, net	(3,537)	(2,973)	389
Other	563	0	0
Accounts receivable	(559)	2,259	(546)
Inventories	(1,111)	353	(2,552)
Other current assets	(2,566)	279	3,634
Other noncurrent assets	318	(270)	(3)
Accounts payable	1,835	(1,592)	1,287
Accrued liabilities	2,334	(6,415)	4,953
Accrued employee costs	(260)	1,322	2,525
Lease liability	(3,595)	(3,097)	(2,871)
Other current liabilities	16,649	2,330	(539)
Net cash used in operating activities	(106,913)	(118,826)	(109,911)
Cash flows from investing activities:
Purchase of property, plant, and equipment (including advance)	(5,107)	(6,104)	(7,439)
Purchase of non-marketable equity investments	0	(5,000)	0
Purchase of available-for-sale securities	(79,980)	(152,364)	(210,197)
Proceeds from maturities of available-for-sale securities	182,988	232,745	328,526
Net cash provided by investing activities	97,901	69,277	110,890
Cash flows from financing activities:
Proceeds from issuance of stock in private placement	0	21,455	0
Transaction costs related to issuance of stock in private placement	0	(818)	0
Payments of taxes withheld on net settled vesting of restricted stock units	(752)	(199)	(720)
Proceeds from exercise of stock options	81	238	350
Proceeds from exercise of warrants	0	0	1
Net cash (used in) provided by financing activities	(671)	20,676	(369)
Net increase (decrease) in cash and cash equivalents	(9,683)	(28,873)	610
Beginning cash and cash equivalents	38,547	67,420	66,810
Ending cash and cash equivalents	28,864	38,547	67,420
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0	0
Cash paid for income taxes	165	0	0
Supplemental disclosure of noncash investing and financing activities:
Unpaid property, plant and equipment purchases	835	90	79
Right-of-use asset obtained in exchange for lease liability	$ 0	$ 2,995	$ 0