Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015
Line of Credit Facility [Line Items]
Amortization of deferred financing costs	$ 231		$ 195		$ 465		$ 295
Interest Expense	1,270	[1]	800	[2]	2,855	[1]	1,415	[2]
Convertible Subordinated Notes
Line of Credit Facility [Line Items]
Interest incurred on convertible subordinated notes to affiliate	132		86		385		86
Amortization of discount	100				100
Working Capital Facility
Line of Credit Facility [Line Items]
Commitment fees	30		44		113		141
Letters of credit fees	165		124		457		223
Working Capital Facility | Senior Credit Facility
Line of Credit Facility [Line Items]
Interest incurred on Senior Credit Facility	$ 712		$ 351		$ 1,435		$ 670

[1] Financial information has been recast to include results attributable to the acquisition of Major Energy Companies by an affiliate on April 15, 2016. See Notes 2 and 3 "Basis of Presentation" and "Acquisitions," respectively, for further discussion.

[2] Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC from an affiliate on May 12, 2015. See Notes 2 "Basis of Presentation" for further discussion.