Other Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Down payments to manufacturing vendors	$ 216,538	$ 0
Prepaid expenses	15,647	8,475
Tenant incentives receivables	10,242	4,093
Interest receivable on marketable securities	9,725	6,835
Prepaid expenses and other current assets	$ 252,152	$ 19,403

Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Name:	us-gaap_PrepaidExpenseCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant