Balance Sheet Components - Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 1,939,000		$ 1,939,000		$ 1,532,000
Operating lease liabilities	2,090,000		2,090,000		1,613,000
Current operating lease liabilities	237,000		237,000		190,000
Non-current operating lease liabilities	1,853,000		1,853,000		$ 1,423,000
Cash paid for operating lease liabilities	70,917	$ 51,767	187,880	$ 130,740
Right-of-use assets obtained in exchange for new operating lease obligations	$ 175,901	$ 77,549	$ 592,331	$ 1,150,443
ASU 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets						$ 743,000