Business Segment and Geographic Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Business Segment and Geographic Data [Abstract]
Number of operating units					3				3
Results of operations from business segments [Abstract]
Revenues	$ 56,681		$ 34,745		$ 165,860		$ 103,333
Cost of revenues	11,281		8,142		34,870		20,054
Gross profit	45,400		26,603		130,990		83,279
Gross profit % (in hundredths)	80.10%		76.60%		79.00%		80.60%
Allocated operating expenses [Abstract]
Engineering and product development	628		281		2,146		700
Selling and marketing expenses	28,285		15,468		85,188		45,505
Unallocated operating expenses	6,231		4,540		22,593		36,279
Total operating expenses	35,144		20,289		109,927		82,484
Income (loss) from operations	10,256		6,314		21,063		795
Interest and other financing income (expense), net	(231)		(91)		(862)		101
Net income (loss) before taxes	10,025		6,223		20,201		896
Net revenues by geographic area [Abstract]
Revenues	56,681		34,745		165,860		103,333
Long-lived assets by geographic area [Abstract]
Long-lived assets	5,993		791		5,993		791
North America [Member]
Results of operations from business segments [Abstract]
Revenues	38,888	[1]	23,958	[1]	121,524	[1]	71,807	[1]
Net revenues by geographic area [Abstract]
Revenues	38,888	[1]	23,958	[1]	121,524	[1]	71,807	[1]
Long-lived assets by geographic area [Abstract]
Long-lived assets	5,206		0		5,206		0
Asia Pacific [Member]
Results of operations from business segments [Abstract]
Revenues	9,533	[2]	8,538	[2]	23,306	[2]	25,349	[2]
Net revenues by geographic area [Abstract]
Revenues	9,533	[2]	8,538	[2]	23,306	[2]	25,349	[2]
Long-lived assets by geographic area [Abstract]
Long-lived assets	0		0		0		0
Europe (Including Israel) [Member]
Results of operations from business segments [Abstract]
Revenues	7,170		1,964		18,623		4,947
Net revenues by geographic area [Abstract]
Revenues	7,170		1,964		18,623		4,947
Long-lived assets by geographic area [Abstract]
Long-lived assets	787		791		787		791
South America [Member]
Results of operations from business segments [Abstract]
Revenues	1,090		285		2,407		1,230
Net revenues by geographic area [Abstract]
Revenues	1,090		285		2,407		1,230
Long-lived assets by geographic area [Abstract]
Long-lived assets	0		0		0		0
United States [Member]
Results of operations from business segments [Abstract]
Revenues	31,380		18,952		101,473		60,888
Net revenues by geographic area [Abstract]
Revenues	31,380		18,952		101,473		60,888
Japan [Member]
Results of operations from business segments [Abstract]
Revenues	8,144		8,373		18,318		23,929
Net revenues by geographic area [Abstract]
Revenues	8,144		8,373		18,318		23,929
CONSUMER [Member]
Results of operations from business segments [Abstract]
Revenues	49,638		33,632		142,303		99,718
Cost of revenues	7,366		7,719		22,307		18,721
Gross profit	42,272		25,913		119,996		80,997
Gross profit % (in hundredths)	85.20%		77.00%		84.30%		81.20%
Allocated operating expenses [Abstract]
Engineering and product development	165		245		642		584
Selling and marketing expenses	24,980		14,906		74,673		43,963
Unallocated operating expenses	0		0		0		0
Total operating expenses	25,145		15,151		75,315		44,547
Income (loss) from operations	17,127		10,762		44,681		36,450
Interest and other financing income (expense), net	0		0		0		0
Net income (loss) before taxes	17,127		10,762		44,681		36,450
Net revenues by geographic area [Abstract]
Revenues	49,638		33,632		142,303		99,718
PHYSICIAN RECURRING [Member]
Results of operations from business segments [Abstract]
Revenues	5,121		0		15,467		0
Cost of revenues	2,811		0		8,095		0
Gross profit	2,310		0		7,372		0
Gross profit % (in hundredths)	45.10%		0.00%		47.70%		0.00%
Allocated operating expenses [Abstract]
Engineering and product development	278		0		863		0
Selling and marketing expenses	2,575		0		7,526		0
Unallocated operating expenses	0		0		0		0
Total operating expenses	2,853		0		8,389		0
Income (loss) from operations	(543)		0		(1,017)		0
Interest and other financing income (expense), net	0		0		0		0
Net income (loss) before taxes	(543)		0		(1,017)		0
Net revenues by geographic area [Abstract]
Revenues	5,121		0		15,467		0
PROFESSIONAL [Member]
Results of operations from business segments [Abstract]
Revenues	1,922		1,113		8,090		3,615
Cost of revenues	1,104		423		4,468		1,333
Gross profit	818		690		3,622		2,282
Gross profit % (in hundredths)	42.60%		61.80%		44.80%		62.80%
Allocated operating expenses [Abstract]
Engineering and product development	185		36		641		116
Selling and marketing expenses	730		562		2,989		1,542
Unallocated operating expenses	0		0		0		0
Total operating expenses	915		598		3,630		1,658
Income (loss) from operations	(97)		92		(8)		624
Interest and other financing income (expense), net	0		0		0		0
Net income (loss) before taxes	(97)		92		(8)		624
Net revenues by geographic area [Abstract]
Revenues	$ 1,922		$ 1,113		$ 8,090		$ 3,615

[1] Net revenues (in thousands) from United States for three and nine months ended September 30, 2012 and 2011 are $31,380, $101,473, $18,952 and $60,888 respectively.

[2] Net revenues (in thousands) from Japan for three and nine months ended September 30, 2012 and 2011 are $8,144, $18,318, $8,373 and $23,929 respectively.