Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance	$ 102
Other comprehensive income before reclassifications	9
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	9
Ending Balance	111
Unrealized Gains and Losses on Available-for Sale Securities
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance	1
Other comprehensive income before reclassifications	9
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	9
Ending Balance	10
Foreign Currency Items
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance	101
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	0
Ending Balance	$ 101