OTHER INCOME, NET: (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Nonoperating Income (Expense) [Abstract]
Interest income and gains (losses) on short-term investments, net	$ 878	$ 115
Foreign exchange loss, net	(162)	(9)
Other	(33)	(45)
Other income, net	$ 683	$ 61