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Stock-Based Compensation (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 11, 2015 shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2015 USD ($) item shares | Sep. 30, 2014 USD ($) shares | Sep. 30, 2013 USD ($) | Dec. 31, 2006 shares
Share-Based Compensation Plans |  |  |  |  |  |
Number of stock-based compensation plans | item |  |  | 2 |  |  |
Stock-based compensation expense | $ |  | $ 452,000 | $ 1,156,000 | $ 1,225,000 | $ 1,797,000 |
Legacy Dawson Plan |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Number of shares authorized | 827,647 |  |  |  |  | 750,000
Legacy Dawson Plan | Maximum |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Option expiration term | 10 years |  |  |  |  |
Legacy Dawson Plan | Officers, directors, employees or consultants after merger |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Number of shares authorized | 466,136 |  |  |  |  |
Legacy TGC Plan |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Number of shares authorized | 1,000,000 |  |  |  |  |
Legacy TGC Plan | Maximum |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Option expiration term | 10 years |  |  |  |  |
Legacy TGC Plan | Officers, directors, employees or consultants after merger |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Number of shares authorized | 412,254 |  |  |  |  |
Stock options |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  | 62,000 |
Restricted Stock Awards |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Stock-based compensation expense | $ |  | 213,000 | 363,000 | 821,000 | 1,307,000 |
Restricted Stock Awards | Legacy TGC Plan |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Grants outstanding (in shares) | 0 |  |  |  |  |
Restricted Stock Units |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Stock-based compensation expense | $ |  | $ 74,000 | $ 526,000 | $ 233,000 | 25,000 |
Grants outstanding (in shares) |  | 133,453 | 129,247 | 38,555 |  |
Common Stock Awards |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |
Stock-based compensation expense | $ |  | $ 165,000 | $ 267,000 | $ 171,000 | $ 403,000 |

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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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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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