CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Product sales	$ 33,476	$ 54,041	$ 79,141	$ 108,688
Services	5,501	4,024	9,911	6,593
Clinic services	13,143	0	13,143	0
Total revenues	52,120	58,065	102,195	115,281
Cost of revenues:
Product sales	6,874	9,933	15,482	20,168
Services	1,895	1,457	3,632	3,088
Clinic services	8,883	0	8,883	0
Total cost of revenues	17,652	11,390	27,997	23,256
Gross profit	34,468	46,675	74,198	92,025
Operating expenses:
Engineering and product development	723	814	1,518	1,587
Selling and marketing	30,420	30,468	62,046	59,794
General and administrative	11,452	6,268	19,039	11,927
Total operating expenses	42,595	37,550	82,603	73,308
Operating (loss) profit	(8,127)	9,125	(8,405)	18,717
Other loss:
Interest and other financing expense, net	(175)	(134)	(321)	(3)
(Loss) Income before income tax benefit (expense)	(8,302)	8,991	(8,726)	18,714
Income tax benefit (expense)	822	(1,897)	901	(4,408)
Net (loss) income	(7,480)	7,094	(7,825)	14,306
Net (loss) income per share:
Basic (in dollars per share)	$ (0.40)	$ 0.34	$ (0.42)	$ 0.69
Diluted (in dollars per share)	$ (0.40)	$ 0.34	$ (0.42)	$ 0.68
Shares used in computing net (loss) income per share:
Basic (in shares)	18,723,484	20,573,048	18,721,463	20,624,588
Diluted (in shares)	18,723,484	21,033,349	18,721,463	21,084,889
Other comprehensive income :
Foreign currency translation adjustments	693	21	1,030	(1,792)
Comprehensive (loss) income	$ (6,787)	$ 7,115	$ (6,795)	$ 12,514