Foreign Exchange Transaction Gains/Losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other income (expense), net
Foreign exchange gain (loss)	$ 169,000	$ 30,000	$ 244,000	$ 210,000