Financial Instruments - Schedule of Maintenance Fee Payment to CCKF (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
Related Party Transactions [Abstract]
Maintenance Fee Payments	$ 1,443	[1]	$ 348

[1] During the first quarter of 2020, the Company prepaid approximately $1.4 million of maintenance payments, of which approximately $0.4 million was recognized as expense during the current quarter.