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STOCKHOLDERS' EQUITY: - Compensation Plan (Details) $ / shares in Units, $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2015 $ / shares | Jan. 31, 2015 MXN / shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2010 $ / shares | Dec. 31, 2010 MXN / shares
Employee Stock Purchase 2007 Plan |  |  |  |  |  |
Stock award activity, Shares |  |  |  |  |  |
Outstanding shares at the beginning of the year | shares |  |  | 109,241 | 4,298,612 |  |
Exercised (in shares) | shares |  |  | (64,380) | (4,189,371) |  |
Outstanding shares at the end of the year | shares |  |  | 44,861 | 109,241 |  |
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |
Outstanding shares at the beginning of the year (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 year (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 | $ |  |  | $ 1.2 | $ 1.7 |  |
Period over which unrecognized compensation expense expected to be recognized |  |  | 2 years 3 months |  |  |
Purchase price for initial subscription (in dollars per share) | (per share) |  |  |  |  | $ 2.05 | MXN 26.51
Stock award activity, Shares |  |  |  |  |  |
Outstanding shares at the beginning of the year | shares |  |  | 2,227,582 | 2,287,891 |  |
Exercised (in shares) | shares |  |  | (740,601) | (60,309) |  |
Outstanding shares at the end of the year | shares |  |  | 1,486,981 | 2,227,582 |  |
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |
Outstanding shares at the beginning of the year (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 year (in dollars per share) | $ / shares |  |  | $ 2.05 | $ 2.05 |  |
Employee Stock Purchase 2015 Plan |  |  |  |  |  |
Information related to compensation cost |  |  |  |  |  |
Stock based compensation expense | $ |  |  | $ 0.4 | $ 0.2 |  |
Unrecognized compensation expense | $ |  |  | $ 4.0 | $ 4.6 |  |
Purchase price for initial subscription (in dollars per share) | (per share) | $ 2.63 | MXN 38.44 |  |  |  |
Stock award activity, Shares |  |  |  |  |  |
Outstanding shares at the beginning of the year | shares |  |  | 2,656,386 |  |  |
Granted (in shares) | shares |  |  |  | 2,656,386 |  |
Exercised (in shares) | shares |  |  | (103,852) |  |  |
Outstanding shares at the end of the year | shares |  |  | 2,552,534 | 2,656,386 |  |
Unit Weighted Average Grant Date Fair Value |  |  |  |  |  |
Outstanding shares at the beginning of the year (in dollars per share) | $ / shares |  |  | $ 2.63 |  |  |
Granted (in dollars per share) | $ / shares |  |  |  | $ 2.63 |  |
Exercised (in dollars per share) | $ / shares |  |  | 2.63 |  |  |
Outstanding shares at the end of the year (in dollars per share) | $ / shares |  |  | $ 2.63 | $ 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 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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