Intangible Assets

12 Months Ended

Dec. 31, 2014

12. Intangible Assets

Intangible assets, consisting of acquired technology, customer relationships and trademarks, are amortized using the straight-line method over their useful lives of five to ten years.

The gross carrying amount and accumulated amortization of the Company's acquired identifiable intangible assets as of December 31, 2014 are as follows:

	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization			Total
Acquired technology	8 years	$	17,696,835	$	(16,539,683	)	$	1,157,152
Customer relationships	8 years		1,260,000		(977,833	)		282,167
Trademark	5 years		60,000		(9,000	)		51,000

		$	19,016,835	$	(17,526,516	)	$	1,490,319

The gross carrying amount and accumulated amortization of the Company's acquired identifiable intangible assets as of December 31, 2013 are as follows:

	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization			Total
Acquired technology	8 years	$	17,036,835	$	(14,301,907	)	$	2,734,928
Customer relationships	8 years		1,000,000		(833,333	)		166,667

		$	18,036,835	$	(15,135,240	)	$	2,901,595

The change in the gross carrying amount of the acquired technology, customer relationships, and trademarks from December 31, 2013 to December 31, 2014 is due to the acquisition of ReliOn.

Amortization expense for acquired identifiable intangible assets for the years ended December 31, 2014, 2013, and 2012 was $2.4 million, $2.3 million, and $2.3 million, respectively. Estimated amortization expense for subsequent years is as follows:

2015	$	807,819
2016		170,000
2017		170,000
2018		170,000
2019		62,000
Thereafter		110,500

Total	$	1,490,319