Summary of Revised Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Accounts payable and accrued expenses	$ 29,847	$ 49,512
Total current liabilities	67,237	129,964
Redeemable Non-Controlling Interest	24,321	33,069
Accumulated deficit	(435,562)	(427,126)
Non-Controlling Interest	26,604	27,913
Total Stockholders' Deficit	$ (248,589)	(252,976)	$ (145,735)
As Reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Accounts payable and accrued expenses		51,503
Total current liabilities		131,955
Redeemable Non-Controlling Interest		34,461
Accumulated deficit		(429,117)
Non-Controlling Interest		26,521
Total Stockholders' Deficit		(256,359)
Adjustments
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Accounts payable and accrued expenses		(1,991)
Total current liabilities		(1,991)
Redeemable Non-Controlling Interest		(1,392)
Accumulated deficit		1,991
Non-Controlling Interest		1,392
Total Stockholders' Deficit		$ 3,383