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STOCKHOLDERS' EQUITY: (Details 4) In Millions, except Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 Employee Stock Purchase Plan USD ($) | Sep. 30, 2013 Employee Stock Purchase Plan USD ($) | Sep. 30, 2014 New Employee Stock Purchase Plan USD ($) | Sep. 30, 2013 New Employee Stock Purchase Plan USD ($) | Dec. 31, 2010 New Employee Stock Purchase Plan USD ($) | Dec. 31, 2010 New Employee Stock Purchase Plan MXN
Information related to compensation cost |  |  |  |  |  |
Stock based compensation expense | $ 1.6 | $ 1.6 | $ 0.4 | $ 0.4 |  |
Unrecognized compensation expense | $ 0.5 | $ 2.6 | $ 2.2 | $ 2.8 |  |
Period over which unrecognized compensation expense expected to be recognized | 3 months |  | 4 years |  |  |
Stock award activity, Shares |  |  |  |  |  |
Outstanding shares at the beginning of the period | 4,449,599 | 6,955,572 | 3,012,464 | 2,944,742 |  |
Granted (in shares) |  |  |  | 226,613 |  |
Exercised (in shares) | (140,545) | (2,396,354) | (724,573) | (22,470) |  |
Forfeited (in shares) |  | (31,159) |  | (103,513) |  |
Outstanding shares at the end of the period | 4,309,054 | 4,528,059 | 2,287,891 | 3,045,372 |  |
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 |  |
Granted (in dollars per share) |  |  |  | $ 2.05 |  |
Exercised (in dollars per share) | $ 1.16 | $ 1.16 | $ 2.05 | $ 2.05 |  |
Forfeited (in dollars per share) |  | $ 1.16 |  | $ 2.05 |  |
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

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