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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