Business Segments and Geographic Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	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, 2013 Segment	Dec. 31, 2012	Dec. 31, 2011
Business Segment and Geographic Data [Abstract]
Number of operating segments													3
Results of operations from business segments [Abstract]
Revenues	$ 63,490	$ 45,893	$ 58,065	$ 57,216	$ 54,791	$ 56,681	$ 58,906	$ 50,273	$ 28,749	$ 34,745	$ 33,847	$ 34,741	$ 224,664	$ 220,651	$ 132,082
Cost of revenues													45,035	46,642	26,296
Gross profit	50,777	36,827	46,675	45,350	43,019	45,400	46,551	39,039	22,507	26,603	28,157	28,519	179,629	174,009	105,786
Gross profit % (in hundredths)													80.00%	78.90%	80.10%
Allocated operating expenses [Abstract]
Engineering and product development													3,306	2,914	1,057
Selling and marketing expenses													127,528	116,487	62,185
Unallocated operating expenses													26,750	27,330	45,192
Total operating expenses													157,584	146,731	108,434
Operating profit (loss)													22,045	27,278	(2,648)
Interest and other financing income (expense), net													702	(351)	(68)
Net income (loss) before taxes													22,747	26,927	(2,716)
CONSUMER [Member]
Results of operations from business segments [Abstract]
Revenues													188,259	188,425	125,581
Cost of revenues													26,794	28,965	23,309
Gross profit													161,465	159,460	102,272
Gross profit % (in hundredths)													85.80%	84.60%	81.40%
Allocated operating expenses [Abstract]
Engineering and product development													1,100	876	837
Selling and marketing expenses													112,898	102,736	59,424
Unallocated operating expenses													0	0	0
Total operating expenses													113,998	103,612	60,261
Operating profit (loss)													47,467	55,848	42,011
Interest and other financing income (expense), net													0	0	0
Net income (loss) before taxes													47,467	55,848	42,011
PHYSICIAN RECURRING [Member]
Results of operations from business segments [Abstract]
Revenues													28,548	21,284	829
Cost of revenues													13,022	11,512	456
Gross profit													15,526	9,772	373
Gross profit % (in hundredths)													54.40%	46.00%	45.00%
Allocated operating expenses [Abstract]
Engineering and product development													1,371	1,201	27
Selling and marketing expenses													12,681	10,203	319
Unallocated operating expenses													0	0	0
Total operating expenses													14,052	11,404	346
Operating profit (loss)													1,474	(1,632)	27
Interest and other financing income (expense), net													0	0	0
Net income (loss) before taxes													1,474	(1,632)	27
PROFESSIONAL [Member]
Results of operations from business segments [Abstract]
Revenues													7,857	10,942	5,672
Cost of revenues													5,219	6,165	2,531
Gross profit													2,638	4,777	3,141
Gross profit % (in hundredths)													33.60%	43.70%	55.40%
Allocated operating expenses [Abstract]
Engineering and product development													835	837	193
Selling and marketing expenses													1,949	3,548	2,442
Unallocated operating expenses													0	0	0
Total operating expenses													2,784	4,385	2,635
Operating profit (loss)													(146)	392	506
Interest and other financing income (expense), net													0	0	0
Net income (loss) before taxes													$ (146)	$ 392	$ 506