Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 409,788	$ 396,489	$ 402,277
Cost of sales	87,853	86,525	98,912
Gross profit	321,935	309,964	303,365
Sales and marketing	181,287	178,080	166,547
General and administrative	74,404	87,157	79,074
Research and development	28,803	26,389	24,994
Restatements and related costs	2,005	9,083	15,614
Charges related to U.S. Government resolutions (Note 12)	14,369
Operating income	21,067	9,255	17,136
Interest income (expense), net	763	(489)	(1,785)
Other expense, net	(2,806)	(259)	(2,895)
Income before income taxes	19,024	8,507	12,456
Income tax expense	(15,527)	(10,849)	(16,200)
Net income (loss) from continuing operations	3,497	(2,342)	(3,744)
Discontinued operations (Note 12)
Loss from discontinued operations	(638)	(1,827)	(7,157)
Income tax benefit	197	1,360	2,364
Net loss from discontinued operations	(441)	(467)	(4,793)
Net income (loss)	$ 3,056	$ (2,809)	$ (8,537)
Net income (loss) per common share—basic
Net income (loss) from continuing operations	$ 0.19	$ (0.12)	$ (0.20)
Net loss from discontinued operations	(0.02)	(0.03)	(0.26)
Net income (loss) per common share—basic	0.17	(0.15)	(0.46)
Net income (loss) per common share—diluted
Net income (loss) from continuing operations	0.19	(0.12)	(0.20)
Net loss from discontinued operations	(0.02)	(0.03)	(0.26)
Net income (loss) per common share—diluted	$ 0.17	$ (0.15)	$ (0.46)
Weighted average number of common shares:
Basic	18,144,019	18,795,194	18,459,054
Diluted	18,463,161	18,795,194	18,459,054
Other comprehensive loss, before tax
Unrealized gain (loss) on derivative instrument	$ (360)	$ 202	$ 307
Unrealized loss on debt securities	(1,744)	(3,348)
Reclassification adjustment for loss on debt securities in net income	2,727
Currency translation adjustment	(726)	(3,907)	(4,133)
Other comprehensive loss before tax	(103)	(7,053)	(3,826)
Income tax related to items of other comprehensive loss	(245)	1,203	(59)
Other comprehensive loss, net of tax	(348)	(5,850)	(3,885)
Comprehensive income (loss)	$ 2,708	$ (8,659)	$ (12,422)