Revenue Recognition - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Revenue Recognition And Deferred Revenue [Abstract]
Aggregate amount of transaction price allocated to material rights that remain unsatisfied	$ 1,383
Revenue expected to be recognized in next 9 months	58.00%
Revenue expected to be recognized in 2020	21.00%
Revenue expected to be recognized in 2021	12.00%
Revenue expected to be recognized in 2022	5.00%
Revenue expected to be recognized in 2023	4.00%