Leases - Additional Information (Detail) $ in Thousands		1 Months Ended		9 Months Ended
	Nov. 09, 2020	Sep. 30, 2020 USD ($) ft²	Jun. 30, 2020 USD ($) ft²	Sep. 30, 2020 USD ($) ft² Option	Dec. 31, 2019 USD ($)
Lessee Lease Description [Line Items]
Square feet of office space leased | ft²		33,300		33,300
Tenant improvements				$ 8,000
Additional tenant improvements		$ 1,500		1,500
Cash deposit		900		900
Tenant improvement allowance receivable reimbursable by the landlord				4,200
Accounts Payable and Accrued Liabilities		3,900		3,900
Termination fees for lease termination				500
Operating lease right of use asset			$ 300
Leasehold improvements, gross			$ 200
Operating lease right-of-use assets		10,398		10,398	$ 770
Finance lease right-of-use assets		200		200	$ 300
Irrevocable Letters of Credit [Member]
Lessee Lease Description [Line Items]
Cash deposit		$ 500		$ 500
USA [Member]
Lessee Lease Description [Line Items]
Lease agreement, commencement date				Jan. 15, 2020
Lease agreement, expiration date				Dec. 01, 2028
Number of option to extend leases | Option				2
Lease agreement option to extend lease term				five-year
USA [Member] | Subsequent Event [Member]
Lessee Lease Description [Line Items]
Lease agreement, commencement date	Feb. 01, 2021
Lease agreement, expiration date	Feb. 01, 2029
Washington [Member]
Lessee Lease Description [Line Items]
Square feet of office space leased | ft²		6,272		6,272
Amortization of right-of-use assets		$ 1,000
Reduction in lease obligation		$ 1,000
Canada [Member]
Lessee Lease Description [Line Items]
Square feet of office space leased | ft²			10,946