Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Summary of acquisition-related intangible assets
Gross Carrying Amount	$ 3,203	$ 1,651	$ 3,203
Accumulated Amortization	1,295	(582)	1,295
Impairment of intangible asset	518		518
Net Carrying Value	1,390	1,069	1,390
Acquired Technology [Member]
Summary of acquisition-related intangible assets
Gross Carrying Amount	1,552		1,552
Accumulated Amortization	1,034		1,034
Impairment of intangible asset			(518)
Net Carrying Value
Trade names and trademarks [Member]
Summary of acquisition-related intangible assets
Gross Carrying Amount	180	180	180
Accumulated Amortization	92	(180)	92
Impairment of intangible asset
Net Carrying Value	88	0	88
Customer relationships [Member]
Summary of acquisition-related intangible assets
Gross Carrying Amount	1,275	1,275	1,275
Accumulated Amortization	141	(276)	141
Impairment of intangible asset
Net Carrying Value	1,134	999	1,134
Non-compete agreements [Member]
Summary of acquisition-related intangible assets
Gross Carrying Amount	196	196	196
Accumulated Amortization	28	(126)	28
Impairment of intangible asset
Net Carrying Value	$ 168	$ 70	$ 168