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Adoption Impact of New Revenue Standard (Impact on Income Statement) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [3]
Sep. 30, 2017
 [3]
Jun. 30, 2017
 [3]
Mar. 31, 2017
 [3]
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue                      
Commission                 $ 227,211 $ 176,883 [1],[2] $ 177,234 [1],[2]
Other                 24,184 13,823 [1],[2] 16,090 [1],[2]
Total revenue $ 134,917 $ 40,751 $ 32,657 $ 43,070 $ 83,118 $ 31,466 $ 34,566 $ 41,556 251,395 190,706 [1],[2],[3] 193,324 [1],[2]
Operating costs and expenses:                      
Cost of revenue                 1,228 582 [2] 862 [2]
Marketing and advertising                 82,939 65,874 [2] 72,213 [2]
Customer care and enrollment                 70,547 59,183 [2] 48,718 [2]
Technology and content                 31,970 32,889 [2] 32,749 [2]
General and administrative                 45,828 39,969 [2] 35,216 [2]
Acquisition costs                 76 621 [2] 0 [2]
Restructuring charge (benefit)                 1,865 0 [2] (297) [2]
Amortization of intangible assets                 2,091 1,040 [2],[4] 1,040 [2],[4]
Total operating costs and expenses                 248,844 200,158 [2] 190,501 [2]
Income (loss) from operations 41,645 (15,454) (16,920) (6,720) 20,802 (15,673) (10,468) (4,113) 2,551 (9,452) [2],[3] 2,823 [2]
Other income, net                 755 1,182 [2] 1,149 [2]
Income (loss) before provision (benefit) for income taxes                 3,306 (8,270) [2] 3,972 [2]
Provision (benefit) for income taxes                 3,065 (33,696) [2] 3,668 [2]
Net income $ 26,072 $ (8,972) $ (12,014) $ (4,845) $ 28,028 $ (2,176) $ (1,506) $ 1,080 $ 241 [5] $ 25,426 [2],[3],[4],[5] $ 304 [2],[4],[5]
Net Income per share - basic (in usd per share) $ 1.32 [6] $ (0.47) [6] $ (0.63) [6] $ (0.26) [6] $ 1.50 [6] $ (0.12) [6] $ (0.08) [6] $ 0.06 [6] $ 0.01 [6] $ 1.37 [2],[3],[6] $ 0.02 [2]
Net Income per share - diluted (in usd per share) $ 1.25 [6] $ (0.47) [6] $ (0.63) [6] $ (0.26) [6] $ 1.47 [6] $ (0.12) [6] $ (0.08) [6] $ 0.06 [6] $ 0.01 [6] $ 1.33 [2],[3],[6] $ 0.02 [2]
Calculated under Revenue Guidance in Effect before Topic 606                      
Revenue                      
Commission                   $ 158,424 $ 170,850
Other                   13,931 16,110
Total revenue                   172,355 186,960
Operating costs and expenses:                      
Cost of revenue                   2,273 3,176
Marketing and advertising                   65,874 72,213
Customer care and enrollment                   59,183 48,718
Technology and content                   32,889 32,749
General and administrative                   39,969 35,216
Acquisition costs                   621  
Restructuring charge (benefit)                     (297)
Amortization of intangible assets                   1,040 1,040
Total operating costs and expenses                   201,849 192,815
Income (loss) from operations                   (29,494) (5,855)
Other income, net                   327 102
Income (loss) before provision (benefit) for income taxes                   (29,167) (5,753)
Provision (benefit) for income taxes                   (3,755) (871)
Net income                   $ (25,412) $ (4,882)
Net Income per share - basic (in usd per share)                   $ (1.37) $ (0.27)
Net Income per share - diluted (in usd per share)                   $ (1.37) $ (0.27)
ASC 606 Adoption Adjustment | Accounting Standards Update 2014-09                      
Revenue                      
Commission                   $ 18,459 $ 6,384
Other                   (108) (20)
Total revenue                   18,351 6,364
Operating costs and expenses:                      
Cost of revenue                   (1,691) (2,314)
Marketing and advertising                   0 0
Customer care and enrollment                   0 0
Technology and content                   0 0
General and administrative                   0 0
Acquisition costs                   0  
Restructuring charge (benefit)                     0
Amortization of intangible assets                   0 0
Total operating costs and expenses                   (1,691) (2,314)
Income (loss) from operations                   20,042 8,678
Other income, net                   855 1,047
Income (loss) before provision (benefit) for income taxes                   20,897 9,725
Provision (benefit) for income taxes                   (29,941) 4,539
Net income                   $ 50,838 $ 5,186
Net Income per share - basic (in usd per share)                   $ 2.74 $ 0.29
Net Income per share - diluted (in usd per share)                   $ 2.70 $ 0.29
[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.
[5] Balances and the years ended December 31, 2016 and 2017 have been adjusted for the adoption of ASC 606 using the full retrospective method.
[6] Computed using weighted-average share amounts outstanding for the respective periods presented