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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Face (par) amount of the original debt instrument that was repurchased.

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Gross number of share options (or share units) granted during the period.

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Earnings Per Share - Dilutive Potential Common Shares (Details) - USD ($) $ in Millions			1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 01, 2018	May 16, 2013	Jan. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	May 31, 2020	Sep. 30, 2019	Jul. 20, 2017	Apr. 04, 2017
Earnings Per Share
Number of dilutive potential common stock						204,174,726	201,150,449
Interest rate (as a percent)				9.50%		9.50%
$40M Convertible Senior Note
Earnings Per Share
Principal amount										$ 40.0
Interest rate (as a percent)										7.50%
$200M Convertible Senior Notes
Earnings Per Share
Debt Instrument, Repurchased Face Amount									$ 66.3
Interest rate (as a percent)									5.50%
Warrants issued with the Amazon.com, Inc transaction agreement
Earnings Per Share
Shares of common stock that can be purchased from warrants issued (in shares)												55,286,696
Number of warrants exercised (in shares)						0
Warrants issued with the Walmart Stores, Inc transaction agreement
Earnings Per Share
Shares of common stock that can be purchased from warrants issued (in shares)											55,286,696
Number of warrants exercised (in shares)						0
Series C Preferred Stock
Earnings Per Share
Temporary Equity, Stock Issued During Period, Shares, New Issues		10,431
Series E Preferred Stock
Earnings Per Share
Temporary Equity, Stock Issued During Period, Shares, New Issues	35,000
Conversion of Stock, Shares Issued			500					30,462
Number of shares redeemed								4,038
Stock options
Earnings Per Share
Number of dilutive potential common stock						16,273,120	21,258,304
Stock options granted				174,649	339,392	174,649	364,392
Restricted stock
Earnings Per Share
Number of dilutive potential common stock						4,455,484	2,504,392
Stock options granted				96,649	339,392	94,649	364,392
Warrants
Earnings Per Share
Number of dilutive potential common stock						110,573,392	115,824,142
Preferred stock
Earnings Per Share
Number of dilutive potential common stock							17,933,591
Convertible Senior Notes
Earnings Per Share
Number of dilutive potential common stock						72,872,730	43,630,020