Commitments and Contingencies - Summary of Non-Cancellable Operating Leases, Primarily for Office Space and Certain Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Lessee Lease Description [Line Items]
Right-of-Use Asset	$ 14,092	$ 15,744
Minneapolis, MN Lease [Member]
Lessee Lease Description [Line Items]
Remaining Term (in years)	5 years	5 years
Right-of-Use Asset	$ 9,870	$ 10,704
Kyiv, Ukraine Lease [Member]
Lessee Lease Description [Line Items]
Remaining Term (in years)	5 years	5 years
Right-of-Use Asset	$ 2,027	$ 2,316
Little Falls, NJ Lease [Member]
Lessee Lease Description [Line Items]
Remaining Term (in years)	3 years	4 years
Right-of-Use Asset	$ 1,265	$ 1,574
Other Leases [Member]
Lessee Lease Description [Line Items]
Right-of-Use Asset	$ 930	$ 1,150
Other Leases [Member] | Minimum [Member]
Lessee Lease Description [Line Items]
Remaining Term (in years)	1 year	1 year
Other Leases [Member] | Maximum [Member]
Lessee Lease Description [Line Items]
Remaining Term (in years)	5 years	5 years