Income Taxes - Significant Components of our Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Domestic	$ 0	$ 0	$ 0
Foreign	166	0	0
Total current provision	166	0	0
Deferred:
Domestic	0	0	0
Foreign	0	0	0
Total deferred provision	0	0	0
Income tax expense (benefit)	$ 166	$ 0	$ 0