Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accrued Expenses and Other Current Liabilities (Details)

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Summary of Significant Accounting Policies - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Accrued compensation, payroll taxes, and benefits $ 29,405 $ 25,677
Sales tax obligations 3,673 4,930
Current portion of liabilities related to acquisitions 47,173 34,430
Lease-related liabilities 2,640 2,288
Other current liabilities 12,591 12,054
Total accrued expenses and other current liabilities $ 95,482 $ 79,379