Financial Instruments - Schedule of Changes in Fair Value of Liability Classified Stock Options (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Derivative Liability Roll Forward [Roll Forward]
Liability at beginning of the period	$ 45,569
Liability at end of the period	33,899
Liability classified stock options
Derivative Liability Roll Forward [Roll Forward]
Liability at beginning of the period	45,569
Reclassification to liabilities from equity	110
Increase (decrease) in fair value of liability classified stock options	(7,317)
Exercise of options	(566)
Unrealized foreign currency loss (gain)	(3,897)
Liability at end of the period	$ 33,899