Commitments and Contingencies - Additional Information (Detail) CAD in Thousands, $ in Thousands	Feb. 05, 2016 CAD ft²	Jan. 01, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)
Contingencies And Commitments [Line Items]
Operating lease obligation, annual basic rent for first year | $			$ 35
Subsequent Event [Member]
Contingencies And Commitments [Line Items]
Operating lease obligation, annual basic rent for first year	CAD 252	$ 154
Operating lease obligation, annual basic rent for second year	252	159
Operating lease obligation, annual basic rent for third year	263	$ 164
Operating lease obligation, annual basic rent for fourth year | CAD	274
Operating lease obligation, annual basic rent for fifth year | CAD	CAD 274
CANADA | Subsequent Event [Member]
Contingencies And Commitments [Line Items]
Lease agreement, commencement date	Nov. 01, 2016
Lease agreement, expiration date	Oct. 31, 2021
Square feet of office space leased | ft²	10,946
Lease agreement extended period	Oct. 31, 2026
CALIFORNIA | Subsequent Event [Member]
Contingencies And Commitments [Line Items]
Lease agreement, commencement date		Jan. 01, 2016
Lease agreement, expiration date		Dec. 31, 2018
Square feet of office space leased | ft²		3,520
Lease agreement extended period		Dec. 31, 2021