Business Segment and Geographic Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Segment and Geographic Data [Abstract]
Number of operating units													3
Results of operations from business segments [Abstract]
Revenues	$ 54,791	$ 56,681	$ 58,906	$ 50,273	$ 28,749	$ 34,745	$ 33,847	$ 34,741	$ 22,889	$ 27,861	$ 12,746	$ 6,575	$ 220,651	$ 132,082	$ 70,071
Cost of revenues													46,642	26,296	16,465
Gross profit	43,019	45,400	46,551	39,039	22,507	26,603	28,157	28,519	19,410	21,133	8,839	4,224	174,009	105,786	53,606
Gross profit % (in hundredths)													78.90%	80.10%	76.50%
Allocated operating expenses [Abstract]
Engineering and product development													2,914	1,057	839
Selling and marketing expenses													116,487	62,185	28,950
Unallocated operating expenses													27,330	45,192	5,646
Total operating expenses													146,731	108,434	35,435
Operating profit (loss)													27,278	(2,648)	18,171
Interest and other financing income (expense), net													(351)	(68)	(283)
Net income (loss) before taxes													26,927	(2,716)	17,888
Net revenues by geographic area [Abstract]
Revenues	54,791	56,681	58,906	50,273	28,749	34,745	33,847	34,741	22,889	27,861	12,746	6,575	220,651	132,082	70,071
Long-lived assets by geographic area [Abstract]
Long-lived assets	6,759				5,324				759				6,759	5,324	759
North America [Member]
Results of operations from business segments [Abstract]
Revenues													163,973	91,821	34,971
Net revenues by geographic area [Abstract]
Revenues													163,973	91,821	34,971
Long-lived assets by geographic area [Abstract]
Long-lived assets	5,772				4,496				4				5,772	4,496	4
Asia Pacific [Member]
Results of operations from business segments [Abstract]
Revenues													28,031	28,213	30,199
Net revenues by geographic area [Abstract]
Revenues													28,031	28,213	30,199
Long-lived assets by geographic area [Abstract]
Long-lived assets	0				0				0				0	0	0
Europe (Including Israel) [Member]
Results of operations from business segments [Abstract]
Revenues													25,521	9,994	3,604
Net revenues by geographic area [Abstract]
Revenues													25,521	9,994	3,604
Long-lived assets by geographic area [Abstract]
Long-lived assets	987				828				755				987	828	755
South America [Member]
Results of operations from business segments [Abstract]
Revenues													3,126	2,054	1,297
Net revenues by geographic area [Abstract]
Revenues													3,126	2,054	1,297
Long-lived assets by geographic area [Abstract]
Long-lived assets	0				0				0				0	0	0
United States [Member]
Results of operations from business segments [Abstract]
Revenues													135,950	75,341	33,138
Net revenues by geographic area [Abstract]
Revenues													135,950	75,341	33,138
Japan [Member]
Results of operations from business segments [Abstract]
Revenues													21,134	25,924	29,530
Net revenues by geographic area [Abstract]
Revenues													21,134	25,924	29,530
CONSUMER [Member]
Results of operations from business segments [Abstract]
Revenues													188,425	125,581	66,655
Cost of revenues													28,965	23,309	15,039
Gross profit													159,460	102,272	51,616
Gross profit % (in hundredths)													84.60%	81.40%	77.40%
Allocated operating expenses [Abstract]
Engineering and product development													876	837	585
Selling and marketing expenses													102,736	59,424	27,470
Unallocated operating expenses													0	0	0
Total operating expenses													103,612	60,261	28,055
Operating profit (loss)													55,848	42,011	23,561
Interest and other financing income (expense), net													0	0	0
Net income (loss) before taxes													55,848	42,011	23,561
Net revenues by geographic area [Abstract]
Revenues													188,425	125,581	66,655
PHYSICIAN RECURRING [Member]
Results of operations from business segments [Abstract]
Revenues													21,284	829	0
Cost of revenues													11,512	456	0
Gross profit													9,772	373	0
Gross profit % (in hundredths)													45.90%	45.00%	0.00%
Allocated operating expenses [Abstract]
Engineering and product development													1,201	27	0
Selling and marketing expenses													10,203	319	0
Unallocated operating expenses													0	0	0
Total operating expenses													11,404	346	0
Operating profit (loss)													(1,632)	27	0
Interest and other financing income (expense), net													0	0	0
Net income (loss) before taxes													(1,632)	27	0
Net revenues by geographic area [Abstract]
Revenues													21,284	829	0
PROFESSIONAL [Member]
Results of operations from business segments [Abstract]
Revenues													10,942	5,672	3,416
Cost of revenues													6,165	2,531	1,426
Gross profit													4,777	3,141	1,990
Gross profit % (in hundredths)													43.70%	55.40%	58.30%
Allocated operating expenses [Abstract]
Engineering and product development													837	193	254
Selling and marketing expenses													3,548	2,442	1,480
Unallocated operating expenses													0	0	0
Total operating expenses													4,385	2,635	1,734
Operating profit (loss)													392	506	256
Interest and other financing income (expense), net													0	0	0
Net income (loss) before taxes													392	506	256
Net revenues by geographic area [Abstract]
Revenues													$ 10,942	$ 5,672	$ 3,416