Financial Instruments - Schedule of Financial Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Liabilities
Financial liabilities measured at fair value	$ 35,667	$ 46,547
Liability classified stock options
Liabilities
Financial liabilities measured at fair value	34,621	45,569
Liability for Contingent Consideration
Liabilities
Financial liabilities measured at fair value	1,046	978
Level 3
Liabilities
Financial liabilities measured at fair value	35,667	46,547
Level 3 | Liability classified stock options
Liabilities
Financial liabilities measured at fair value	34,621	45,569
Level 3 | Liability for Contingent Consideration
Liabilities
Financial liabilities measured at fair value	$ 1,046	$ 978