Intangible Assets and Goodwill - Goodwill Analysis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Oct. 14, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 3.8	$ 3.8		$ 28.1
Goodwill impairment loss	$ 0.0	$ 28.1
Goodwill | Income approach valuation technique
Goodwill [Line Items]
Discounted forecasted cash flow period		10 years
Discount rate		16.00%
Goodwill | Income approach valuation technique | Minimum
Goodwill [Line Items]
Terminal growth rates		0.00%
Goodwill | Income approach valuation technique | Maximum
Goodwill [Line Items]
Terminal growth rates		3.00%
Nexsan Corporation
Goodwill [Line Items]
Goodwill impairment loss		$ 28.1
Connected Data, Inc.
Goodwill [Line Items]
Goodwill			$ 3.8