Preferred Shares Series E (Details) - USD ($) $ in Thousands				9 Months Ended
	Sep. 17, 2020	Jul. 14, 2020	May 06, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 14, 2020	Apr. 30, 2020	Aug. 13, 2019	Jul. 12, 2019
Other Liabilities Disclosure [Abstract]
Convertible Preferred Stock, Terms of Conversion	Each Series E Preferred Share shall have a stated value of $1,000 and is convertible into the Company’s common shares at a conversion price equal to the lower of (i) 80% of the average of the three lowest VWAPs of the common stock during the ten trading days immediately preceding, but not including, the conversion date and (ii) $2.00; however, in no event shall the conversion price be lower than $1.00 per share.	Series B Preferred Shares (i) are convertible into the Company’s common shares, subject to prior shareholder approval, at a conversion rate equal to $1.00 per share, plus accrued and unpaid dividends, divided by an amount equal to 0.85 multiplied by a 15-day volume weighted average price per common share prior to the date the conversion notice is provided (the “Conversion Rate”), subject to a conversion price floor of $0.80	Each shareholder of the Series D Preferred Shares, may, at any time, convert all or any part of the Series D Preferred Shares provided that after such conversion the common shares issuable, together with all the common shares held by the shareholder in the aggregate would not exceed 9.9% of the total number of outstanding common shares of the Company or in the aggregate no more than the exchange cap of 800,000 common shares by all holders of Series D Preferred Shares.	Series E Preferred Shares, may, at any time, convert all or any Series E Preferred Shares provided that (i) the common shares issuable upon such conversion, together with all other common shares of the Company held by the shareholder in the aggregate, would not cause such shareholder’s ownership of the Company’s common shares to exceed 9.99% of the total number of outstanding common shares of the Company (ii) and such conversion would not exceed the maximum number of Sphere common shares that may be issued upon conversion of all shares of Series E Preferred Stock in the aggregate of 1,500,000 common shares
Preferred Stock, Dividend Rate, Percentage				8.00%
Preferred Shares, Shares Issued		6,500,000				3,000	1,694,000	343,778	6,500,000
Proceeds from Issuance of Preferred Stock and Preference Stock				$ 2,735	$ 0
Related Party [Member]
Other Liabilities Disclosure [Abstract]
Payments of Stock Issuance Costs				240
Related Party Transaction [Line Items]
Payments of Stock Issuance Costs				$ 240