This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Name:	us-gaap_OperatingLeasesRentExpenseMinimumRentals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Commitments and Contingencies - Additional Information (Detail) $ in Thousands		12 Months Ended
	Jul. 22, 2015 USD ($) ft²	Dec. 31, 2016 USD ($) Agreement	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Payment of security deposit		$ 0	$ 74	$ 0
Rent expense		294	$ 247	$ 125
Milestone payments from the Company		$ 19,000
Number of additional license agreements \| Agreement		2
License agreements fee (up to)		$ 2,300
Jersey City, New Jersey
Unrecorded Unconditional Purchase Obligation [Line Items]
Sublet premises area (in square feet) \| ft²	10,141
Monthly base rent	$ 25
Percent increase in base rent annually	3.00%
Payment of security deposit	$ 74