Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Accrued compensation and related benefits	$ 6,089	$ 5,344
Accrued freelancer costs	1,665	622
Accrued indirect taxes	1,746	2,401
Accrued vendor expenses	9,499	5,485
Accrued payment processing fees	870	832
Operating lease liability, current	3,134	3,214
Other	391	444
Total accrued expenses and other current liabilities	23,394	$ 18,342
Organization Structure Updates [Member]
Restructuring Cost and Reserve [Line Items]
Accrued compensation and related benefits	400
Restructuring and related cost, incurred cost	$ 1,600