Balance Sheets Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Balance Sheet Related Disclosures [Line Items]
Depreciation expense	$ 1,000	$ 2,700	$ 900	$ 2,400
Amortization expense for intangible assets	300	$ 2,300	1,200	$ 3,700
Impairment of internal-use software			959
Intangibles Assets not amortized	700		700
Research and Development Expense
Balance Sheet Related Disclosures [Line Items]
Impairment of internal-use software	$ 800		$ 1,000