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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Product sales $ 84,997 $ 87,761 $ 261,490 $ 251,461
Marketing service fees 13,500 13,390 39,761 40,406
Net sales 98,497 101,151 301,251 291,867
Cost of sales 19,880 23,865 64,533 65,114
Gross profit 78,617 77,286 236,718 226,753
Operating expenses        
Sales and marketing 41,717 46,129 132,582 133,360
General and administrative 18,581 19,348 53,341 63,423
Research and development 6,858 6,523 21,294 18,819
Restatements and related costs 691 1,147 1,481 9,276
Charges related to U.S. Government resolutions (Note 11) 1,499   14,369  
Total operating expenses 69,346 73,147 223,067 224,878
Operating income 9,271 4,139 13,651 1,875
Other income and expense        
Interest income (expense), net 471 (125) 320 (323)
Other (expense) income, net (634) (1,736) 1,346 (192)
Total other income (expense) (163) (1,861) 1,666 (515)
Income before income taxes 9,108 2,278 15,317 1,360
Income tax benefit (expense) 1,276 (3,066) (6,703) (5,808)
Net income (loss) from continuing operations 10,384 (788) 8,614 (4,448)
Discontinued operations (Note 11)        
Loss from discontinued operations (1,018) (804) (3,580) (2,315)
Income tax benefit 530 221 1,258 585
Net loss from discontinued operations (488) (583) (2,322) (1,730)
Net income (loss) $ 9,896 $ (1,371) $ 6,292 $ (6,178)
Net income (loss) per common share—basic:        
Net income (loss) from continuing operations $ 0.57 $ (0.04) $ 0.47 $ (0.24)
Net loss from discontinued operations (0.02) (0.03) (0.13) (0.09)
Net income (loss) per common share—basic 0.55 (0.07) 0.34 (0.33)
Net income (loss) per common share—diluted:        
Net income (loss) from continuing operations 0.56 (0.04) 0.46 (0.24)
Net loss from discontinued operations (0.02) (0.03) (0.12) (0.09)
Net income (loss) per common share—diluted $ 0.54 $ (0.07) $ 0.34 $ (0.33)
Weighted average number of common shares:        
Basic 18,091,650 18,855,533 18,238,533 18,785,696
Diluted 18,382,118 18,855,533 18,569,861 18,785,696
Other comprehensive income (loss):        
Unrealized (loss) gain on derivative instruments, net of tax $ (2) $ (706) $ 74 $ 230
Unrealized gain on debt securities, net of tax 3,008   539  
Foreign currency translation adjustment 820 (365) 1,471 (3,666)
Comprehensive income (loss) $ 13,722 $ (2,442) $ 8,376 $ (9,614)