Lease Commitments - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Option	Sep. 30, 2020 USD ($)
Lessee Lease Description [Line Items]
Operating leases, rent expense	$ 0.2	$ 0.2	$ 0.6	$ 0.4
Cash payments for operating lease costs			0.5	0.8
Prepaid Lease Payments
Lessee Lease Description [Line Items]
Cash payments for operating lease costs			$ 0.1	$ 0.6
Buffalo Grove, Illinois
Lessee Lease Description [Line Items]
Operating leases, remaining lease terms	3 years 7 months 6 days		3 years 7 months 6 days
Operating lease number of option to extend | Option			1
Operating lease, option to extend description			Both operating leases contain an option to extend the term for one additional five year period
Operating lease, renewal term	5 years		5 years
Florham Park, New Jersey
Lessee Lease Description [Line Items]
Operating leases, remaining lease terms	3 years 10 months 24 days		3 years 10 months 24 days
Operating lease number of option to extend | Option			1
Operating lease, option to extend description			Both operating leases contain an option to extend the term for one additional five year period
Operating lease, renewal term	5 years		5 years