Accrued Payroll and Benefits - Schedule of Accrued Payroll and Benefits (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Accrued bonuses	$ 7,854	$ 3,449
Accrued paid time off	2,157	2,154
Accrued payroll	5,536	4,470
Accrued other	2,410	959
Total accrued payroll and benefits	$ 17,957	$ 11,032