Certain Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid Expense, Current		$ 11,453	$ 3,050
Contract assets (1)	[1]	9,800	13,969
Other current assets		16,879	23,743
Prepaid Expense and Other Assets, Total		$ 38,132	$ 40,762

[1] Contract assets reflect the satisfied performance obligations for which the Company does not yet have an unconditional right to consideration.