Goodwill and Purchased Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Intangible Assets [Abstract]

Schedule of Goodwill [Table Text Block]

Goodwill

The changes in the carrying amount of goodwill are as follows:

Balance at December 31, 2013	$	22,553
Goodwill acquired during the period	(58		)
Balance at December 31, 2014	22,495
Goodwill acquired during the period	—
Balance at December 31, 2015	$	22,495

Schedule of Finite-Lived Intangible Assets [Table Text Block]

Purchased intangible assets as of December 31, 2015 and 2014 are as follows:

	Gross Carrying Amount		Accumulated Amortization		Net
December 31, 2015
Finite-lived intangibles:
Developed technology	$	65,527	$	55,110	$	10,417
Customer and distributor relationships	9,560		8,170		1,390
Trade names	4,361		3,575		786
Total identifiable intangible assets	$	79,448	$	66,855	$	12,593
December 31, 2014
Finite-lived intangibles:
Developed technology	$	59,831	$	53,417	$	6,414
Customer and distributor relationships	9,560		7,818		1,742
Trade names	4,361		3,475		886
Total identifiable intangible assets	$	73,752	$	64,710	$	9,042