Note 7. Intangibles

The following table presents the gross carrying amount and accumulated amortization of intangible assets as of September 30, 2012 (in thousands):



	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
Developed technology	$	40,200	$	19,371	$	20,829	7 years
In-process research and development	1,900		207		1,693		8 years
Customer relationships	17,600		2,611		14,989		9 years
Trademarks	5,200		627		4,573		10 years
Lease agreements	2,600		574		2,026		5 years
Total acquired intangible assets from Vocollect acquisition:	67,500		23,390		44,110
Other intangibles	14,432		10,519		3,913		5 years
Total	$	81,932	$	33,909	$	48,023

The following table presents the gross carrying amount and accumulated amortization of intangible assets as of December 31, 2011 (in thousands):



	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Useful Life
Developed technology	$	40,200	$	9,416	$	30,784	7 years
In-process research and development	1,900		—		1,900		8 years
Customer relationships	17,600		623		16,977		9 years
Trademarks	5,200		303		4,897		10 years
Lease agreements	2,600		245		2,355		5 years
Total acquired intangible assets from Vocollect acquisition:	67,500		10,587		56,913
Other intangibles	14,459		9,376		5,083		5 years
Total	$	81,959	$	19,963	$	61,996

Total amortization expense on intangibles for the three and nine months ended September 30, 2012 was $4.7 million and $14.1 million, respectively, and $3.3 million and $7.6 million for the three and nine months ended October 2, 2011, respectively. Estimated future amortization expense for intangible assets for the next five years is as follows (in thousands):




Year	Amount
Remainder of 2012	$	5,634
2013	12,352
2014	11,036
2015	8,265
2016	4,924