Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2019

Notes To Financial Statements [Abstract]

Summary of Goodwill by Reportable Segment

The change in the carrying value of goodwill for the six months ended June 30, 2019, all attributable to our Clear Aligner reporting unit, is as follows (in thousands):

	Total
Balance as of December 31, 2018	$	64,029
Adjustments 1	(6		)
Balance as of June 30, 2019	$	64,023

¹ The adjustments to goodwill during the period were a result of foreign currency translation.

Schedule of Amortized Intangible Assets

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

	Weighted Average Amortization Period (in years)	Gross Carrying Amount as of June 30, 2019		Accumulated Amortization			Accumulated Impairment Loss			Net Carrying Value as of June 30, 2019
Trademarks	15	$	7,100	$	(1,976	)	$	(4,179	)	$	945
Existing technology	13	12,600		(5,549		)	(4,328		)	2,723
Customer relationships	11	33,500		(17,473		)	(10,751		)	5,276
Reacquired rights	3	7,500		(5,705		)	—			1,795
Patents	8	6,796		(2,749		)	—			4,047
Other	2	618		(575		)	—			43
Total intangible assets		$	68,114	$	(34,027	)	$	(19,258	)	$	14,829

	Weighted Average Amortization Period (in years)	Gross Carrying Amount as of December 31, 2018		Accumulated Amortization			Accumulated Impairment Loss			Net Carrying Value as of December 31, 2018
Trademarks	15	$	7,100	$	(1,907	)	$	(4,179	)	$	1,014
Existing technology	13	12,600		(5,268		)	(4,328		)	3,004
Customer relationships	11	33,500		(16,542		)	(10,751		)	6,207
Reacquired rights	3	7,500		(4,341		)	—			3,159
Patents	8	6,796		(2,334		)	—			4,462
Other	2	618		(544		)	—			74
Total intangible assets		$	68,114	$	(30,936	)	$	(19,258	)	$	17,920

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The total estimated annual future amortization expense for these acquired intangible assets as of June 30, 2019 is as follows (in thousands):

Fiscal Year Ending December 31,	Amortization
Remainder of 2019	$	3,045
2020	3,844
2021	3,389
2022	2,116
2023	1,495
Thereafter	940
Total	$	14,829