Organization and Summary of Significant Accounting Policies - PPE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts		$ 0.0
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	8 years
Oklahoma | Building
Property, Plant and Equipment [Line Items]
Useful life (in years)	39 years