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Restatement of Consolidated Financial Statements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Error correction and prior-period adjustments
Revenue	$ 81,282	$ 56,915	$ 236,523	$ 184,409
Fair value, available-for-sale securities	352,015		352,015		$ 441,186
Cash and cash equivalents	151,871		151,871		128,967
Marketable securities	267,857		267,857		373,682
Net cash used in investing activities			1,089	(146,074)	(97,600)
Adjustments
Error correction and prior-period adjustments
Revenue				3,575
Fair value, available-for-sale securities					7,200
Adjustments | Sunnyvale Facility, Second Amended
Error correction and prior-period adjustments
Asset retirement obligation						$ 1,000
As originally reported
Error correction and prior-period adjustments
Revenue				180,834
Cash and cash equivalents					136,100
Marketable securities					366,500
Net cash used in investing activities					(90,400)
Royalties
Error correction and prior-period adjustments
Revenue	$ 33,044	$ 16,602	$ 103,813	56,828
Royalties | Adjustments
Error correction and prior-period adjustments
Revenue				3,575	$ 3,600	$ 3,600
Royalties | As originally reported
Error correction and prior-period adjustments
Revenue				$ 53,253

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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