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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 20,945 $ 5,663 $ 607
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 9,421 7,162 5,486
(Gain)/loss on disposition of property and equipment 15   (248)
Amortization of debt discount and debt issuance costs 157 133 258
Write off of debt issuance costs   4,051  
Stock-based compensation expense 3,010 712 934
Employee stock purchase plan compensation expense 209    
Net change in derivative liability   (1,107) (660)
Deferred income taxes, net (1,021) 2,259 517
Changes in operating assets and liabilities:      
Accounts receivable 440 (1,089) (1,083)
Prepaid expenses (1,579) (465) (800)
Inventory (224) 267 136
Deposits and other assets (810) (232) (44)
Accounts payable (431) (2,386) 2,667
Income taxes, net (5,808) (122) (150)
Accrued commissions and bonuses 3,607 1,482 1,645
Accrued payroll and vacation 1,316 (1,505) 1,162
Deferred revenue 9,699 6,765 4,163
Accrued expenses and other current liabilities 4,026 749 2,394
Net cash provided by operating activities 42,972 22,337 16,984
Cash flows from investing activities:      
Increase in funds held for clients (36,146) (204,778) (131,513)
Decrease (increase) in restricted cash 371 (2) (1)
Purchases of property and equipment (16,549) (14,270) (17,176)
Proceeds from sale of property and equipment     258
Net cash used in investing activities (52,324) (219,050) (148,432)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt   6,538 6,979
Principal payments on long-term debt (1,118) (65,650)  
Increase in client funds obligation 36,146 204,778 131,513
Proceeds from initial public offering, net of offering costs   62,840  
Incentive units redeemed     (1,061)
Payments of deferred offering costs     (647)
Distributions paid to stockholders     (5,409)
Payment of debt issuance costs (106) (11)  
Net cash provided by financing activities 34,922 208,495 131,375
Change in cash and cash equivalents 25,570 11,782 (73)
Cash and cash equivalents      
Beginning of year 25,144 13,362 13,435
End of year 50,714 25,144 13,362
Supplemental disclosures of cash flow information:      
Cash paid for interest, net of amounts capitalized 1,271 3,482 9,298
Cash paid for income taxes 19,205 2,013 378
Noncash investing and financing activities:      
Purchases of property and equipment, accrued but not paid 1,613 408 368
Stock based compensation for capitalized software $ 220 $ 4 $ 229