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STOCKHOLDERS' EQUITY: (Details 4) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) MXN / shares | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2014 USD ($) $ / shares shares | Dec. 31, 2010 $ / shares | Dec. 31, 2010 MXN / shares
Stock award activity, Shares |  |  |  |  |
Granted (in shares) |  | 13,200 | 12,000 |  |
Employee Stock Purchase 2007 Plan |  |  |  |  |
Information related to compensation cost |  |  |  |  |
Stock based compensation expense | $ |  |  | $ 1.6 |  |
Unrecognized compensation expense | $ |  |  | $ 0.5 |  |
Stock award activity, Shares |  |  |  |  |
Outstanding shares at the beginning of the period |  | 4,298,612 | 4,449,599 |  |
Exercised (in shares) |  | (4,189,371) | (140,545) |  |
Outstanding shares at the end of the period |  | 109,241 | 4,309,054 |  |
Unit Weighted Average Grant Date Fair Value |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares |  | $ 1.16 | $ 1.16 |  |
Exercised (in dollars per share) | $ / shares |  | 1.16 | 1.16 |  |
Outstanding shares at the end of the period (in dollars per share) | $ / shares |  | $ 1.16 | $ 1.16 |  |
Employee Stock Purchase 2010 Plan |  |  |  |  |
Information related to compensation cost |  |  |  |  |
Stock based compensation expense | $ |  | $ 0.4 | $ 0.4 |  |
Unrecognized compensation expense | $ | $ 1.7 | $ 1.7 | $ 2.2 |  |
Period over which unrecognized compensation expense expected to be recognized |  | 3 years 3 months 18 days |  |  |
Stock award activity, Shares |  |  |  |  |
Outstanding shares at the beginning of the period |  | 2,287,891 | 3,012,464 |  |
Exercised (in shares) |  | (60,309) | (724,573) |  |
Outstanding shares at the end of the period |  | 2,227,582 | 2,287,891 |  |
Unit Weighted Average Grant Date Fair Value |  |  |  |  |
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares |  | $ 2.05 | $ 2.05 |  |
Exercised (in dollars per share) | $ / shares |  | 2.05 | 2.05 |  |
Outstanding shares at the end of the period (in dollars per share) | $ / shares |  | $ 2.05 | $ 2.05 |  |
Purchase price for initial subscription (in dollars per share) | (per share) |  |  |  | $ 2.05 | MXN 26.51
Employee Stock Purchase 2015 Plan |  |  |  |  |
Information related to compensation cost |  |  |  |  |
Stock based compensation expense | $ |  | $ 0.2 |  |  |
Unrecognized compensation expense | $ | $ 4.6 | $ 4.6 |  |  |
Stock award activity, Shares |  |  |  |  |
Granted (in shares) |  | 2,652,886 |  |  |
Outstanding shares at the end of the period |  | 2,652,886 |  |  |
Unit Weighted Average Grant Date Fair Value |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 2.63 |  |  |
Outstanding shares at the end of the period (in dollars per share) | $ / shares |  | 2.63 |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) | $ 38.44 | $ 2.63 |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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