Investments in Other Entities - Platform Partner (Details) - Platform Partner - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2017	Dec. 31, 2016
Other Assets
Schedule of Cost-method Investments [Line Items]
Cost method investment			$ 1.0	$ 1.0
Variable Interest Entity, Not Primary Beneficiary
Schedule of Cost-method Investments [Line Items]
Return on investment	$ 2.5
Variable Interest Entity, Not Primary Beneficiary | Series A Convertible Preferred Shares
Schedule of Cost-method Investments [Line Items]
Cost method investment, original cost		$ 3.5
Cost method investment, shares		3,548,820
Ownership interest in cost method investment		18.70%
Cost method investment		$ 0.2
Impairment losses	$ 0.3
Variable Interest Entity, Not Primary Beneficiary | Common Stock
Schedule of Cost-method Investments [Line Items]
Ownership interest in cost method investment	8.60%
Shares converted	3,548,820
2013 Secured Convertible Note | Variable Interest Entity, Not Primary Beneficiary
Schedule of Cost-method Investments [Line Items]
Related party notes receivable, face amount		$ 2.0
Conversion rate		12.50%
Notes receivable		$ 1.9
Interest receivable	$ 0.2
2013 Secured Convertible Note | Variable Interest Entity, Not Primary Beneficiary | Automatic Conversion Feature
Schedule of Cost-method Investments [Line Items]
Related party notes receivable, face amount		$ 0.1