Business Segment and Geographic Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Segment	Mar. 31, 2012	Dec. 31, 2012
Business Segment and Geographic Data [Abstract]
Number of operating units	3
Results of operations from business segments [Abstract]
Revenues	$ 57,216	$ 50,273
Cost of revenues	11,866	11,234
Gross profit	45,350	39,039
Gross profit % (in hundredths)	79.30%	77.70%
Allocated operating expenses [Abstract]
Engineering and product development	773	758
Selling and marketing expenses	29,326	25,835
Unallocated operating expenses	5,659	7,119
Total operating expenses	35,758	33,712
Operating profit	9,592	5,327
Interest and other financing income (expense), net	131	(230)
Net income (loss) before taxes	9,723	5,097
Net revenues by geographic area [Abstract]
Revenues	57,216	50,273
Long-lived assets by geographic area [Abstract]
Long-lived assets	7,744		6,759
North America [Member]
Results of operations from business segments [Abstract]
Revenues	44,899	38,689
Net revenues by geographic area [Abstract]
Revenues	44,899	38,689
Long-lived assets by geographic area [Abstract]
Long-lived assets	6,641		5,772
Asia Pacific [Member]
Results of operations from business segments [Abstract]
Revenues	5,762	5,307
Net revenues by geographic area [Abstract]
Revenues	5,762	5,307
Long-lived assets by geographic area [Abstract]
Long-lived assets	0		0
Europe (Including Israel) [Member]
Results of operations from business segments [Abstract]
Revenues	5,633	5,208
Net revenues by geographic area [Abstract]
Revenues	5,633	5,208
Long-lived assets by geographic area [Abstract]
Long-lived assets	1,103		987
South America [Member]
Results of operations from business segments [Abstract]
Revenues	922	1,069
Net revenues by geographic area [Abstract]
Revenues	922	1,069
Long-lived assets by geographic area [Abstract]
Long-lived assets	0		0
United States [Member]
Results of operations from business segments [Abstract]
Revenues	38,007	36,622
Net revenues by geographic area [Abstract]
Revenues	38,007	36,622
Japan [Member]
Results of operations from business segments [Abstract]
Revenues	4,262	3,327
Net revenues by geographic area [Abstract]
Revenues	4,262	3,327
CONSUMER [Member]
Results of operations from business segments [Abstract]
Revenues	49,060	42,201
Cost of revenues	7,517	6,772
Gross profit	41,543	35,429
Gross profit % (in hundredths)	84.70%	84.00%
Allocated operating expenses [Abstract]
Engineering and product development	218	237
Selling and marketing expenses	25,631	22,148
Unallocated operating expenses	0	0
Total operating expenses	25,849	22,385
Operating profit	15,694	13,044
Interest and other financing income (expense), net	0	0
Net income (loss) before taxes	15,694	13,044
Net revenues by geographic area [Abstract]
Revenues	49,060	42,201
PHYSICIAN RECURRING [Member]
Results of operations from business segments [Abstract]
Revenues	5,955	5,073
Cost of revenues	2,931	2,679
Gross profit	3,024	2,394
Gross profit % (in hundredths)	50.80%	47.20%
Allocated operating expenses [Abstract]
Engineering and product development	324	310
Selling and marketing expenses	3,174	2,530
Unallocated operating expenses	0	0
Total operating expenses	3,498	2,840
Operating profit	(474)	(446)
Interest and other financing income (expense), net	0	0
Net income (loss) before taxes	(474)	(446)
Net revenues by geographic area [Abstract]
Revenues	5,955	5,073
PROFESSIONAL [Member]
Results of operations from business segments [Abstract]
Revenues	2,201	2,999
Cost of revenues	1,418	1,783
Gross profit	783	1,216
Gross profit % (in hundredths)	35.60%	40.50%
Allocated operating expenses [Abstract]
Engineering and product development	231	211
Selling and marketing expenses	521	1,157
Unallocated operating expenses	0	0
Total operating expenses	752	1,368
Operating profit	31	(152)
Interest and other financing income (expense), net	0	0
Net income (loss) before taxes	31	(152)
Net revenues by geographic area [Abstract]
Revenues	$ 2,201	$ 2,999