Goodwill and intangible assets (Tables)

6 Months Ended

Jun. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Acquired intangible assets

The estimated useful lives and carrying value of acquired intangible assets are as follows:

		December 31, 2010						December 31, 2011						June 30, 2012 (unaudited)
(in thousands)	Weighted average useful life (years)	Gross carrying amount		Accumulated amortization		Net carrying amount		Gross carrying amount		Accumulated amortization		Net carrying amount		Gross carrying amount		Accumulated amortization		Net carrying amount
Intangible assets:
Trademarks	6.9	$	70	$	2	$	68	$	70	$	16	$	54	$	70	$	23	$	47
Non-compete Agreements	2	70		—		70		70		13		57		70		35		35
Customer relationships	8.6	2,350		137		2,213		2,350		690		1,660		2,350		904		1,446
Developed technology	6	1,670		84		1,586		1,670		510		1,160		1,880		703		1,177
In-process R&D	7	210		—		210		210		—		210		—		—		—
Total intangible assets, net		$	4,370	$	223	$	4,147	$	4,370	$	1,229	$	3,141	$	4,370	$	1,665	$	2,705

Estimated future amortization of acquired intangible assets

Amortization of acquired intangible assets is reflected in cost of revenue and operating expenses. The estimated future amortization of acquired intangible assets as of June 30, 2012 (unaudited) was as follows (in thousands):  

2012	$	436
2013	727
2014	567
2015	389
2016	258
Thereafter	328
Total	$	2,705