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Oil and Gas Properties
 12 Months Ended
Dec. 31, 2016
Extractive Industries [Abstract]  
Oil and Gas Properties
4. Oil and Gas Properties

The following table sets forth information concerning the Company's oil and gas properties:

    December 31,    
    2016     2015  
Proved oil and gas properties at cost, net of impairment   $ 5,325,381     $ 8,683,273  
Unevaluated oil and gas properties at cost, net of impairment     154,977       154,836  
Accumulated depreciation, depletion and amortization     (3,662,000 )     (3,223,000 )
   Oil and gas properties, net   $ 1,818,358     $ 5,615,109  

During the years ended December 31, 2016 and 2015, the Company recorded depletion expense of $439,000 and $746,104, respectively. The Company recorded impairment expense of $3,358,000 and $3,231,000 against proved and unevaluated oil and gas properties at December 31, 2016 and 2015, respectively.