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Stock-Based Compensation - Incentive Stock Options (Details) - Stock options - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Number of Optioned Shares |  |  |  |
Balance at the beginning of the period (in shares) |  | 160,434 |  |
Grants (in shares) | 0 | 0 |  |
Forfeited (in shares) |  | (1,760) |  |
Outstanding and vested Legacy TGC options |  | 279,756 |  |
Options cancelled |  | (10,000) |  |
Balance at the end of the period (in shares) | 160,434 | 428,430 |  |
Exercisable at the end of the period (in shares) |  | 428,430 |  |
Weighted Average Exercise Price |  |  |  |
Balance at the beginning of the period (in dollars per share) |  | $ 10.74 |  |
Forfeited (in dollars per share) |  | 10.74 |  |
Outstanding and vested Legacy TGC options (in dollars per share) |  | 14.25 |  |
Legacy TGC options cancelled (in dollars per share) |  | 11.79 |  |
Balance at the end of the period (in dollars per share) | $ 10.74 | 13.01 |  |
Exercisable at the end of the period (in dollars per share) |  | $ 13.01 |  |
Weighted Average Remaining Contractual Term |  |  |  |
Outstanding at the end of the period (in years) |  | 2 years 11 months 5 days |  |
Exercisable at the end of the period (in years) |  | 2 years 11 months 5 days |  |
Additional disclosures |  |  |  |
Tax deductions recorded when options are awarded |  | $ 0 |  |
Unrecognized compensation expense related to share-based compensation plans |  | 0 |  |
Cash received from share-based payment arrangements | $ 0 | $ 0 | $ 32,000 | $ 608,000
Legacy Dawson Plan |  |  |  |
Number of Optioned Shares |  |  |  |
Grants (in shares) | 0 | 0 | 0 | 0
Vested (in shares) | 0 | 0 | 0 | 0
Exercised (in shares) | 0 | 0 |  | 0
Additional disclosures |  |  |  |
Excess tax benefits from disqualifying dispositions | $ 0 | $ 0 | $ 0 | $ 0
Total intrinsic value of options exercised |  |  | $ 13,000 |

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- Definition Weighted average price of stock options acquired in merger. + References No definition available. + Details
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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + 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 (j) -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 Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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