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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities      
Net income [1],[2],[3] $ 25,426 $ 304 $ 3,964
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization [3] 2,837 3,539 4,148
Amortization of internally developed software [3] 1,464 936 627
Amortization of intangible assets [1],[3] 1,040 1,040 1,153
Stock-based compensation expense [3] 9,694 7,266 7,002
Deferred income taxes [3] (30,341) 4,652 8,651
Other non-cash items [3] (101) (143) 106
Changes in operating assets and liabilities:      
Accounts receivable [3] 473 1,563 (1,050)
Commissions receivable [3] (21,640) (8,032) (15,050)
Prepaid expenses and other assets [3] (1,933) (486) 997
Accounts payable [3] (1,866) 2,227 (2,949)
Accrued compensation and benefits [3] 4,578 (3,466) 6,180
Accrued marketing expenses [3] (3,365) (3,906) 1,865
Deferred revenue [3] (466) 587 (770)
Accrued restructuring charges [3] 0 (433) 433
Accrued expense and other liabilities [3] (1,341) (1,565) (1,611)
Net cash provided by (used in) operating activities [3] (15,541) 4,083 13,696
Investing activities      
Capitalized Computer Software, Additions [3] (3,210) (1,837) (1,117)
Purchases of property and equipment and other assets [3] (1,868) (1,889) (1,879)
Net cash used in investing activities [3] (5,078) (3,726) (2,996)
Financing activities      
Net proceeds from exercise of common stock options [3] 1,037 62 1,572
Cash used to net-share settle equity awards [3] (1,802) (1,248) (922)
Principal payments in connection with capital leases [3] (105) (83) (73)
Net cash provided by (used in) financing activities [3] (870) (1,269) 577
Effect of exchange rate changes on cash and cash equivalents [3] 1 (17) 18
Net increase (decrease) in cash and cash equivalents [3] (21,488) (929) 11,295
Cash and cash equivalents at beginning of period [3] 61,781 [4] 62,710 51,415
Cash and cash equivalents at end of period [3] 40,293 [4] 61,781 [4] 62,710
Capital lease obligations incurred [3] 76 51 156
Cash paid for interest [3] 20 14 34
Cash paid for income taxes, net of refunds [3] $ 219 $ 628 $ 6
[1] As adjusted for the adoption of ASC 606 using the full retrospective method
[2] As adjusted for the adoption of ASC 606 using the full retrospective method
[3] As adjusted for the adoption of ASC 606 using the full retrospective method
[4] As adjusted for the adoption of ASC 606 using the full retrospective method