Quarterly report pursuant to Section 13 or 15(d)

Excess Lease Liability - Summary of Excess Lease Facility Liability (Detail)

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Excess Lease Liability - Summary of Excess Lease Facility Liability (Detail) - Excess lease facility [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Operating Leased Assets [Line Items]    
Current portion of excess lease facility, Liability   $ 194
Liability, Total   $ 194
Current portion of excess lease facility, Amortization of excess lease facility $ (194)  
Amortization of excess lease facility $ (194)