Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Inventory (Details)

v3.6.0.2
Summary of Significant Accounting Policies - Inventory (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Amortization of coil tubing strings $ 2,027,752 $ 2,075,787 $ 1,508,761
Coil Tubing Strings      
Property, Plant and Equipment [Line Items]      
Inventory useful life (no longer than) 12 months