Intangible Assets, net (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of intangible assets

Intangible assets as of December 31, 2018 and 2017 comprised the following (in thousands):

	December 31, 2018							December 31, 2017
	Gross carrying amount		Accumulated amortization			Net carrying amount		Gross carrying amount		Accumulated amortization			Net carrying amount
Licensed intellectual property	$	4,750	$	(2,727	)	$	2,023	$	4,750	$	(2,126	)	$	2,624

Summary of estimated future amortization expense

Estimated future amortization expense for these licenses is as follows (in thousands):

Years Ending December 31,	Future Amortization Expense
2019	$	591
2020	591
2021	591
2022	250
Total	$	2,023