Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts Payable Accrued Liabilities And Other Current Liabilities [Line Items]
Other accrued expenses and current liabilities	$ 27,171	$ 24,181
Accrued litigation settlement	20,000
Accrued payroll and employment related withholding taxes	9,314	9,282
Accrued interest on convertible notes	1,158	3,473
Accrued legal and professional fees	905	1,091
Accrued interest on Senior Facility	413	419
Total accrued expenses and other current liabilities	60,461	39,946
ABG [Member]
Accounts Payable Accrued Liabilities And Other Current Liabilities [Line Items]
ABG finance liability - current	$ 1,500	$ 1,500