Intangible Assets and Goodwill (Details) - USD ($)		3 Months Ended		9 Months Ended
	Feb. 02, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Investment capacity under Clinton's management	$ 1,000,000,000
Stock issued (in shares)	1,250,000
Fair value of stock issued	$ 10,100,000
Finite-Lived Intangible Assets, Net [Abstract]
Cost		$ 14,400,000		$ 14,400,000		$ 4,300,000
Accumulated amortization		(2,800,000)		(2,800,000)		(900,000)
Intangible assets, net		11,600,000		11,600,000		3,400,000
Amortization expense		700,000	$ 200,000	1,900,000	$ 600,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization expense, remainder of 2017		700,000		700,000
Amortization expense, 2018		2,700,000		2,700,000
Amortization expense, 2019		2,700,000		2,700,000
Amortization expense, 2020		2,700,000		2,700,000
Amortization expense, 2021		2,600,000		2,600,000
Goodwill		3,800,000		3,800,000		3,800,000
Capacity Agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets useful life (in years)	5 years
Finite-Lived Intangible Assets, Net [Abstract]
Cost		10,100,000		10,100,000		0
Accumulated amortization		(1,400,000)		(1,400,000)		0
Intangible assets, net		8,700,000		8,700,000		0
Developed Technology
Finite-Lived Intangible Assets, Net [Abstract]
Cost		4,300,000		4,300,000		4,300,000
Accumulated amortization		(1,400,000)		(1,400,000)		(900,000)
Intangible assets, net		$ 2,900,000		$ 2,900,000		$ 3,400,000