Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 102
Other comprehensive income before reclassifications	4
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	4
Ending Balance	106
Unrealized Gains and Losses on Available-for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1
Other comprehensive income before reclassifications	4
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	4
Ending Balance	5
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
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