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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Basis of Presentation - (Details) $ in Millions		3 Months Ended	12 Months Ended	17 Months Ended
Basis of Presentation - (Details) $ in Millions	Feb. 21, 2017 shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2018 USD ($)	May 31, 2019 USD ($)	Mar. 31, 2018 USD ($) shares	Feb. 20, 2017 shares	Jan. 31, 2017 shares	Jan. 23, 2017 USD ($)	Jan. 22, 2017
Related Party Transaction [Line Items]
Reverse stock split conversion ratio	0.1
Common stock, shares authorized (in shares) \| shares	10,000,000	10,000,000			10,000,000	100,000,000	1,500,000
Working capital					$ (6.8)
Cash balance and short-term investments					8.4
NXSN Acquisition Corp
Related Party Transaction [Line Items]
Noncontrolling interest, percentage held by noncontrolling owners								50.00%
Senior secured convertible promissory note								$ 25.0
Noncontrolling interest, percentage held by parent								50.00%	100.00%
Nexsan Business
Related Party Transaction [Line Items]
Decrease in operating expenses, percent		40.00%
Deferred revenue					7.4
Nexsan Business \| Scenario, Forecast
Related Party Transaction [Line Items]
Decrease in operating expenses due to cost savings			$ 10.0
Corporate, non-segment \| Scenario, Forecast
Related Party Transaction [Line Items]
Decrease in expected cash flows				$ 0.5
ECJ Copyright Levy
Related Party Transaction [Line Items]
Levy accruals		$ 5.6			$ 5.8