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, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Accrued compensation, payroll taxes, and benefits $ 25,677 $ 21,161
Sales tax obligations 4,930 4,625
Current portion of liabilities related to acquisitions 34,430 13,084
Lease-related liabilities 2,288 1,605
Other current liabilities 12,054 9,989
Total accrued expenses and other current liabilities $ 79,379 $ 50,464