Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Sales and use tax payable	$ 39,250	$ 12,242
Vendor accruals	25,760	17,817
Accrued bonus	19,561	12,906
Payroll-related liabilities	3,172	2,406
Accrued vacation	602	3,787
Total accrued expenses	$ 88,345	$ 49,158