Business Segment Information and Geographic Data - Net Revenue and Operating Income (Loss) by Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 44,100,000	$ 62,800,000
Operating Income (Loss)	(35,000,000)	(140,900,000)
Goodwill impairment	0	(28,100,000)
Other intangibles impairment	0	(29,700,000)
Restructuring and other	(7,600,000)	(36,500,000)
Interest income	200,000	400,000
Interest expense	0	(2,700,000)
Other income (expense), net	(4,900,000)	400,000
Loss from continuing operations before income taxes	(39,700,000)	(142,800,000)
Nexsan Corporation
Segment Reporting Information [Line Items]
Goodwill impairment		(28,100,000)
Operating Segments | Nexsan Corporation
Segment Reporting Information [Line Items]
Net revenue	44,100,000	62,800,000
Operating Income (Loss)	(17,500,000)	(25,400,000)
Corporate and unallocated
Segment Reporting Information [Line Items]
Operating Income (Loss)	(9,900,000)	(21,200,000)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Goodwill impairment	0	(28,100,000)
Other intangibles impairment	0	(29,700,000)
Restructuring and other	$ (7,600,000)	$ (36,500,000)