Intangible assets and goodwill (Tables)

6 Months Ended

Jun. 30, 2019

Schedule of finite-lived intangible assets, net

The components of intangible assets were as follows (in thousands, except for useful life):

Balance at June 30, 2019

Balance at December 31, 2018

Weighted-

Gross

Net

Gross

Net

Average Useful

Carrying

Accumulated

Carrying

Carrying

Accumulated

Carrying

Lives (Years)

Amount

Amortization

Amount

Amount

Amortization

Amount

Finite-lived intangible assets:

Licensed IP

12.5

$

271,000

$

66,404

$

204,596

$

271,000

$

55,636

$

215,364

Schedule of estimated aggregate amortization expense

Estimated aggregate amortization expense based on the current carrying value of amortizable intangible assets is as follows (in thousands):

		Remainder of
		2019		2020		2021		2022		2023		Thereafter
Amortization expense	$	10,771	$	21,536	$	21,536	$	21,536	$	21,536	$	107,681