Accrued Liabilities - Additional Information (Detail) - USD ($)	1 Months Ended
	Aug. 31, 2015	Jun. 30, 2016	Dec. 31, 2015
Schedule Of Accrued Liabilities [Line Items]
Accrued severance expenses		$ 52,000	$ 209,000
James Iademarco [Member]
Schedule Of Accrued Liabilities [Line Items]
One-twelfth of prior base salary	$ 290,000
Salary rate entitlement	8.3333%
Mr. Iademarco Separation Agreement [Member]
Schedule Of Accrued Liabilities [Line Items]
Accrued severance expenses		$ 52,000