Balance Sheet Components - Performance Awards Liability (Details)	1 Months Ended		3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Mar. 31, 2020 USD ($) tranche day $ / shares	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Payment for performance bonus, tranche one						$ 2,000,000
Performance bonus, liability tranche one	$ 2,000,000			$ 2,000,000				$ 3,600,000
Reduction in payment for performance bonus, tranche one	$ 2,000,000
Benefit from adjustment				$ 1,600,000
Bonus compensation expense			$ 0		$ 2,500,000	$ 1,600,000	$ 2,600,000
Maximum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Performance bonus, percent of amount, tranche one								50.00%
Performance bonus, threshold tranche one								$ 8,100,000
Minimum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Performance bonus, percent of amount, tranche one								25.00%
Performance bonus, threshold tranche one								$ 2,000,000
Chief Executive Officer
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Performance bonuses approved		$ 8,100,000
Performance bonus, number of tranches | tranche		2
Percent of bonus subject to performance condition		50.00%
Stock price threshold to earn bonus, tranche one (USD per share) | $ / shares		$ 31.61
Performance bonus, stock price, threshold consecutive trading days | day		20
Performance bonus, percent of amount, tranche two		50.00%
Stock price threshold to earn bonus, tranche two (USD per share) | $ / shares		$ 32.99