Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities and Other Liabilities [Abstract]
Accrued compensation and related benefits	$ 14,007	$ 5,344
Accrued freelancer costs	1,235	622
Accrued indirect taxes	3,818	2,401
Accrued vendor expenses	8,662	5,485
Accrued payment processing fees	1,219	832
Operating lease liability, current	3,725	3,214
Other	202	444
Total accrued expenses and other current liabilities	$ 32,868	$ 18,342