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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash from operating activities    
Net income (loss) $ 7,139 $ (6,992)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 9,347 7,112
Purchased investment premium, net of amortization (22) 185
Amortization of deferred financing costs 48 48
Loss on disposal of property and equipment 94 33
Stock-based compensation 4,304 2,844
Lease abandonment 0 161
Changes in operating assets and liabilities:    
Accounts receivable (908) (659)
Prepaid expenses and other current assets (856) (804)
Other assets (54) (163)
Accounts payable 369 (1,109)
Accrued employee expenses 846 (144)
Accrued expenses 1,713 1,354
Deferred revenue (130) 1,674
Other liabilities (334) 1,183
Net cash provided by operating activities 21,556 4,723
Cash from investing activities    
Purchases of property and equipment (1,680) (3,560)
Additions to capitalized software (8,085) (8,554)
Purchases of investment securities (17,597) (24,334)
Sales of investment securities 15 10,016
Maturities of investment securities 10,974 17,112
Purchases of intangible assets (1) (2)
Net cash used in investing activities (16,374) (9,322)
Cash from financing activities    
Proceeds from stock option exercises 508 260
Tax withholding for net share settlement (1,608) (85)
Principal payments under capital lease obligations 0 (24)
Proceeds from issuance of debt 88 87
Principal payments on debt (88) (99)
Net cash (used in) provided by financing activities (1,100) 139
Net increase (decrease) in cash and cash equivalents 4,082 (4,460)
Cash and cash equivalents    
Beginning of period 10,699 12,063
End of period 14,781 7,603
Noncash investing and financing activities    
Purchases of property and equipment included in accounts payable and accrued expenses 271 112
Additions of capitalized software included in accrued employee expenses 231 231
Stock-based compensation capitalized for software development $ 548 $ 308