Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2016	Mar. 31, 2017	Dec. 31, 2016
Product Liability Contingency [Line Items]
Accounts payable and accrued liabilities		$ 100	$ 100
Drug Product Testing Agreement Consideration To Be Paid In Stages		100
Drug Supplier Commitments Development		100
Prepaid Expense, Current		377	$ 376
Other Commitment		700
Drug Supplier Project Plan [Member]
Product Liability Contingency [Line Items]
Other Commitment		1,100
Office Space
Product Liability Contingency [Line Items]
Operating Leases, Future Minimum Payments Due		200
Lab Space
Product Liability Contingency [Line Items]
Operating Leases, Future Minimum Payments Due		100
Operating Lease Monthly Rental Payments	$ 2,500
Second Drug
Product Liability Contingency [Line Items]
Prepaid Expense, Current		100
Final Drug
Product Liability Contingency [Line Items]
Drug Product Testing Agreement Consideration To Be Paid In Stages		$ 100