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Stockholders' Equity - Incentive Plan (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 12, 2014 | Dec. 31, 2016 | Dec. 31, 2014 | Sep. 08, 2014 | Dec. 20, 2012
Class of Stock [Line Items] |  |  |  |  |
Number of shares authorized |  |  |  |  | 4,000,000
Available future grants and awards (in shares) |  | 1,300,000 |  |  |
Award vesting period |  | 4 years |  |  |
Vested and expected to vest, outstanding (in shares) |  |  |  | 110,000 |
Compensation cost |  |  | $ 1,700,000 |  |
Stock Purchase Plan | Employee Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Maximum stock purchase per employee | $ 1,000,000.0 |  |  |  |
Stock Purchase Plan restricted sale of stock period | 2 years |  |  |  |
Percent of common stock granted in proportion to common stock purchased | 20.00% |  |  |  |
Vesting percentage of restricted stock granted in relation to shares purchased under the Stock Purchase Plan | 50.00% |  |  |  |
Vesting period of restricted stock granted in relation to shares purchased under the Stock Purchase Plan | 2 years |  |  |  |
Term for stock option purchase in relation to Stock Purchase Plan | 5 years |  |  |  |
Vesting percentage of purchase of stock options in relation to shares purchased under the Stock Purchase Plan | 50.00% |  |  |  |
Vesting period of stock options purchased in relation to shares purchased under the Stock Purchase Plan | 2 years |  |  |  |
Non-Employee Chairman | Stock Purchase Plan | Employee Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting percentage of purchase of stock options in relation to shares purchased under the Stock Purchase Plan | 50.00% |  |  |  |
Non-Employee Board Member | Stock Purchase Plan | Employee Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting percentage of purchase of stock options in relation to shares purchased under the Stock Purchase Plan | 35.00% |  |  |  |
Minimum | Executive Officer | Stock Purchase Plan | Employee Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting percentage of purchase of stock options in relation to shares purchased under the Stock Purchase Plan | 50.00% |  |  |  |
Maximum | Executive Officer | Stock Purchase Plan | Employee Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting percentage of purchase of stock options in relation to shares purchased under the Stock Purchase Plan | 70.00% |  |  |  |
Share-based Compensation Award, Tranche One |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares vested (in shares) |  |  | 27,000 |  |
Mid Pac Petroleum, LLC | Share-based Compensation Award, Tranche Two |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares determined by closing or termination of Koko'oha acquisition (in shares) |  |  | 83,000 |  |

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