Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Accrued compensation and related benefits	$ 7,245	$ 5,344
Accrued freelancer costs	1,552	622
Accrued indirect taxes	2,044	2,401
Accrued vendor expenses	9,720	5,485
Accrued payment processing fees	837	832
Operating lease liability, current	3,053	3,214
Other	913	444
Total accrued expenses and other current liabilities	25,364	$ 18,342
Organization Structure Updates
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost	$ 1,600