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Restatement of Consolidated Financial Statements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Error correction and prior-period adjustments
Revenue	$ 84,859	$ 61,717	$ 155,241	$ 127,494
Fair value, available-for-sale securities	291,644		291,644		$ 441,186
Cash and cash equivalents	204,731		204,731		128,967
Marketable securities	272,382		272,382		373,682
Net cash used in investing activities			96,421	(91,380)	(97,600)
Adjustments
Error correction and prior-period adjustments
Revenue		1,787		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		59,930		123,919
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	$ 41,910	18,744	$ 70,769	40,226
Royalties | Adjustments
Error correction and prior-period adjustments
Revenue		1,787		3,575	$ 3,600	$ 3,600
Royalties | As originally reported
Error correction and prior-period adjustments
Revenue		$ 16,957		$ 36,651

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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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