Balance Sheet Components - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Capitalized costs	$ 1.3	$ 1.4	$ 3.5	$ 3.8
Net carrying value	8.3		8.3		$ 6.7
Capitalized internal-use software
Finite-Lived Intangible Assets [Line Items]
Depreciation expense and amortization	$ 2.3	$ 1.7	$ 6.6	$ 5.1