Goodwill and Long-lived Assets (Tables)

9 Months Ended

Sep. 30, 2016

Notes To Financial Statements [Abstract]

Summary of Goodwill by Reportable Segment

The change in the carrying value of goodwill for the nine months ended September 30, 2016, all attributable to our Clear Aligner reporting unit, is as follows (in thousands):

	Clear Aligner
Balance as of December 31, 2015	$	61,074
Adjustments 1	121
Balance as of September 30, 2016	$	61,195

Schedule Of Amortized Intangible Assets

Acquired intangible assets are being amortized as follows (in thousands):

	Weighted Average Amortization Period (in years)	Gross Carrying Amount as of September 30, 2016		Accumulated Amortization			Accumulated Impairment Loss			Net Carrying Value as of September 30, 2016
Trademarks	14	$	7,100	$	(1,597	)	$	(4,179	)	$	1,324
Existing technology	13	12,600		(4,000		)	(4,328		)	4,272
Customer relationships	11	33,500		(12,353		)	(10,751		)	10,396
Patents	8	6,316		(516		)	—			5,800
Total Intangible Assets		$	59,516	$	(18,466	)	$	(19,258	)	$	21,792

	Weighted Average Amortization Period (in years)	Gross Carrying Amount as of December 31, 2015		Accumulated Amortization			Accumulated Impairment Loss			Net Carrying Value as of December 31, 2015
Trademarks	15	$	7,100	$	(1,492	)	$	(4,179	)	$	1,429
Existing technology	13	12,600		(3,577		)	(4,328		)	4,695
Customer relationships	11	33,500		(10,957		)	(10,751		)	11,792
Patents	8	285		(113		)	—			172
Total Intangible Assets		$	53,485	$	(16,139	)	$	(19,258	)	$	18,088

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The total estimated annual future amortization expense for these acquired intangible assets as of September 30, 2016 is as follows (in thousands):

Remainder of 2016	$	840
2017	3,353
2018	3,353
2019	3,346
2020	3,336
Thereafter	7,564
Total	$	21,792