Commitments and Contingencies - Summary of Capital Leases for Office and Manufacturing Equipment (Detail) - Office and Manufacturing Equipment [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Capital Leased Assets [Line Items]
Cost	$ 210	$ 189
Accumulated Depreciation	(37)	(16)
Net Book Value	$ 173	$ 173