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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 66,807 $ 43,840 $ 20,945
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 19,395 13,632 9,421
(Gain)/loss on disposition of property and equipment 21 (64) 15
Amortization of debt discount and debt issuance costs 117 124 157
Stock-based compensation expense 38,542 22,471 3,219
Loss on early repayment of debt 923    
Cash paid for derivative settlement (24)    
Loss on derivative 673    
Deferred income taxes, net (2,087) (1,848) (1,021)
Changes in operating assets and liabilities:      
Accounts receivable (237) 1,015 440
Prepaid expenses (507) (944) (1,579)
Inventory 462 418 (224)
Deposits and other assets (241) 71 (810)
Accounts payable 79 (1,571) (431)
Income taxes, net (6,355) 6,051 (5,808)
Accrued commissions and bonuses 1,582 (684) 3,607
Accrued payroll and vacation 2,246 1,871 1,316
Deferred revenue 11,913 10,675 9,699
Accrued expenses and other current liabilities (2,709) 3,896 4,026
Net cash provided by operating activities 130,600 98,953 42,972
Cash flows from investing activities:      
Net change in funds held for clients (230,957) (161,541) (36,146)
Decrease in restricted cash     371
Purchases of property and equipment (59,389) (43,805) (16,549)
Proceeds from sale of property and equipment   295  
Net cash used in investing activities (290,346) (205,051) (52,324)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 40,940 5,000  
Repurchases of common stock (56,880) (35,561)  
Withholding taxes paid related to net share settlements (32,850) (14,396)  
Principal payments on long-term debt (35,335) (964) (1,118)
Net change in client funds obligation 230,957 161,541 36,146
Debt extinguishment costs (823)    
Payment of debt issuance costs (344) (78) (106)
Net cash provided by financing activities 145,665 115,542 34,922
Net change in cash and cash equivalents (14,081) 9,444 25,570
Cash and cash equivalents      
Beginning of year 60,158 50,714 25,144
End of year 46,077 60,158 50,714
Supplemental disclosures of cash flow information:      
Cash paid for interest, net of amounts capitalized 791 938 1,271
Cash paid for income taxes 18,332 9,323 19,205
Noncash investing and financing activities:      
Purchases of property and equipment, accrued but not paid 6,686 4,651 1,613
Stock-based compensation for capitalized software $ 3,285 $ 1,784 $ 220