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Stock-Based Compensation (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2014 | May 05, 2016
Share-Based Compensation Plans |  |  |  |  |
Stock-based compensation expense | $ 452,000 | $ 879,000 | $ 1,156,000 | $ 1,225,000 |
The 2016 Plan |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |
Numbers of shares available for grant ( in shares) |  | 0 |  |  |
Number of shares authorized |  | 1,000,000 |  |  |
Shares available for future issuance |  | 971,514 |  |  |
Option expiration term |  | 10 years |  |  |
Legacy Dawson Plan |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |
Shares available for future issuance |  |  |  |  | 0
Option expiration term |  | 10 years |  |  |
Legacy TGC Plan |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |
Shares available for future issuance |  | 0 |  |  |
Option expiration term |  | 10 years |  |  |
Unvested stock options |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |
Stock-based compensation expense |  | $ 42,000 |  |  |
Restricted stock |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |
Stock-based compensation expense | 213,000 | $ 347,000 | 363,000 | 821,000 |
Grants outstanding (in shares) |  | 87,000 |  |  |
Restricted stock units |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |
Stock-based compensation expense | 74,000 | $ 73,000 | $ 526,000 | 233,000 |
Grants outstanding (in shares) |  | 253,315 | 129,247 |  |
Common Stock Awards |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |
Stock-based compensation expense | $ 165,000 | $ 417,000 | $ 267,000 | $ 171,000 |

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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 + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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