Patent Licenses (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Future Amortization Expense Related to Intangible Assets Subject to Amortization

At March 31, 2019, future amortization expense related to intangible assets subject to amortization is expected to be as follows (in thousands):

	Amount
2019 (Remaining nine months)		72
2020		91
2021		91
2022		91
2023		91
Thereafter		2,181
Total	$	2,617