Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 13,310	$ 12,597
Accumulated Amortization	(7,123)	(6,108)
Net Carrying Value	6,187	6,489
Weighted Average Useful Life (in Years)	4 years 2 months 12 days	4 years 10 months 24 days
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,490	7,490
Accumulated Amortization	(4,145)	(3,480)
Net Carrying Value	3,345	4,010
Weighted Average Useful Life (in Years)	3 years 9 months 18 days	4 years 7 months 6 days
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,267	3,267
Accumulated Amortization	(2,045)	(1,853)
Net Carrying Value	1,222	1,414
Weighted Average Useful Life (in Years)	4 years 9 months 18 days	5 years 9 months 18 days
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,839	1,840
Accumulated Amortization	(933)	(775)
Net Carrying Value	906	1,065
Weighted Average Useful Life (in Years)	4 years 9 months 18 days	5 years 2 months 12 days
Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	714
Net Carrying Value	$ 714
Weighted Average Useful Life (in Years)	0 years