Intangible assets (Tables)

12 Months Ended

Dec. 31, 2012

Intangible assets [Abstract]

Acquired Intangible Assets by Major Class

The following table summarizes the components of intangible assets (in thousands):

	Non-compete			Partner Relationships			Customer Base			Technology Rights			Tradenames			Indefinite Life Intangibles		Total
As of December 31, 2012
Gross carrying value	$	593		$	145		$	641		$	5,330		$	760		$	250	$	7,719
Accumulated amortization		(426	)		(145	)		(238	)		(1,700	)		(434	)		—		(2,944	)
Net carrying value	$	167		$	—		$	403		$	3,630		$	326		$	250	$	4,775
As of December 31, 2011
Gross carrying value	$	523		$	145		$	181		$	5,330		$	760		$	250	$	7,189
Accumulated amortization		(335	)		(108	)		(109	)		(702	)		(265	)		—		(1,519	)
Net carrying value	$	188		$	37		$	72		$	4,628		$	495		$	250	$	5,670

The following table summarizes the components of purchased technology (in thousands):

		As of December 31,
		2012			2011
Purchased technology	$	350		$	350
Accumulated amortization		(288	)		(207	)
Total purchased technology, net	$	62		$	143

Expected Amortization Expense

The estimated future amortization expense of intangible assets, with the exception of the indefinite-life intangible assets as of December 31, 2012 is as follows (in thousands):

Fiscal Year	Amount
2013	$	1,321
2014		1,091
2015		1,069
2016		1,028
2017		16
Total	$	4,525
Weighted average remaining useful life	3.6 years