Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Operating activities
Net loss	$ (153,730)	$ (246,792)
Adjustments to reconcile net loss to net cash used in operating activities:
Gain on sale of ATOM Facility	(50,237)	0
Stock-based compensation expense	42,475	39,837
Depreciation and amortization expense	4,398	6,857
Amortization of investment premiums	974	1,251
Non-cash operating lease expense	6,103	1,275
Asset retirement obligation accretion expense	70	64
Changes in operating assets and liabilities:
Accounts receivable	737	1,250
Prepaid expenses and other current assets	(3,903)	10,841
Other assets	(139)	27
Accounts payable	(4,760)	8,710
Accrued compensation	(7,545)	(1,318)
Accrued research and development expenses	4,417	(5,839)
Other current liabilities	5,595	1,859
Deferred revenue	(51,468)	(3,182)
Operating lease liabilities	(6,781)	(1,294)
Other long-term liabilities	244	201
Net cash used in operating activities	(213,550)	(186,253)
Investing activities
Purchases of short-term investments	(181,164)	(224,754)
Proceeds from maturities and sales of short-term investments	242,293	279,450
Purchases of property and equipment	(4,156)	(8,114)
Net proceeds from sale of ATOM Facility	94,765	0
Net cash provided by investing activities	151,738	46,582
Financing activities
Proceeds from issuance of common stock through ATM facilities, net	20,516	48,739
Proceeds from employee stock awards	1,452	5,190
Taxes paid related to net share settlement of restricted stock units	(623)	(1,244)
Principal payments on finance lease obligations	(396)	(192)
Other financing activities, net	(155)	(17)
Net cash provided by financing activities	20,794	52,476
Decrease in cash, cash equivalents and restricted cash	(41,018)	(87,195)
Cash, cash equivalents and restricted cash at beginning of period	107,478	201,798
Cash, cash equivalents and restricted cash at end of period	66,460	114,603
Non-cash investing and financing activities
Property and equipment purchases included in accounts payable and other accrued liabilities	35	1,858
Proceeds from issuance of common stock through ATM facilities not yet received	0	2,344
Supplemental cash flow disclosure
Cash paid for interest	256	25
Cash paid for income taxes	$ 19	$ 16

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