STOCKHOLDERS' EQUITY: (Details 4) In Millions, except Share data, unless otherwise specified	3 Months Ended				12 Months Ended		3 Months Ended
	Mar. 31, 2015 Employee Stock Purchase 2007 Plan USD ($)	Mar. 31, 2014 Employee Stock Purchase 2007 Plan USD ($)	Mar. 31, 2015 Employee Stock Purchase 2010 Plan USD ($)	Mar. 31, 2014 Employee Stock Purchase 2010 Plan USD ($)	Dec. 31, 2010 Employee Stock Purchase 2010 Plan USD ($)	Dec. 31, 2010 Employee Stock Purchase 2010 Plan MXN	Mar. 31, 2015 Employee Stock Purchase 2015 Plan USD ($)	Mar. 31, 2015 Employee Stock Purchase 2015 Plan MXN
Information related to compensation cost
Stock based compensation expense		$ 0.5	$ 0.1	$ 0.1
Unrecognized compensation expense		$ 1.6	$ 2.0	$ 2.5
Period over which unrecognized compensation expense expected to be recognized				3 years 9 months
Stock award activity, Shares
Outstanding shares at the beginning of the period	4,298,612	4,449,599	2,287,891	3,012,464
Exercised (in shares)		(40,632)		(249,446)
Forfeited (in shares)	(3,660,945)
Outstanding shares at the end of the period	637,667	4,408,967	2,287,891	2,763,018
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share)	$ 1.16	$ 1.16	$ 2.05	$ 2.05
Exercised (in dollars per share)		$ 1.16		$ 2.05
Forfeited (in dollars per share)	$ 1.16
Outstanding shares at the end of the period (in dollars per share)	$ 1.16	$ 1.16	$ 2.05	$ 2.05
Purchase price for initial subscription (in dollars per share)					$ 2.05	26.51	$ 2.63	38.44