For a classified balance sheet, the cumulative difference as of the balance sheet date between the payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, within one year of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39927-112707

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DeferredRentCreditCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended
	Mar. 31, 2013	Dec. 31, 2010	Mar. 31, 2016	Dec. 31, 2015
Commitment And Contingencies [Line Items]
Deferred rent under sublease agreement			$ 141,344	$ 132,338
BMR-Gateway Boulevard LLC [Member]
Commitment And Contingencies [Line Items]
Term of lease		11 years 6 months
Rent over term of lease		$ 17,869,000
Deferred rent under sublease agreement			1,349,000	1,372,000
Prologis, L.P [Member]
Commitment And Contingencies [Line Items]
Term of lease	10 years
Rent over term of lease	$ 3,497,000
Deferred rent under sublease agreement			$ 379,000	$ 382,000