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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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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or 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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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 Thousands					3 Months Ended
	Jun. 11, 2021	Jan. 07, 2021	Jul. 01, 2020	May 16, 2013	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2021	May 31, 2020	May 29, 2020	May 18, 2020	Sep. 30, 2019	Mar. 31, 2018	Mar. 18, 2018	Jul. 31, 2017	Jul. 20, 2017	Apr. 30, 2017	Apr. 04, 2017
Earnings Per Share
Number of dilutive potential common stock					142,872,691		196,893,462
Number of warrants exercised (in shares)					16,489,014
Interest rate (as a percent)					3.75%			3.75%
Conversion of notes through common stock issuance			16,000,000.0
3.75% Convertible Senior Notes
Earnings Per Share
Principal amount					$ 197,278				$ 212,463	$ 12,500	$ 200,000
Interest rate (as a percent)					3.75%				3.75%	3.75%	3.75%
Conversion of notes through common stock issuance					3,016,036
Convertible Notes Payable					$ 15,200
5.5% Convertible Senior Notes
Earnings Per Share
Principal amount		$ 160				$ 33,500					$ 100,000		$ 100,000
Debt Instrument, Repurchased Face Amount									$ 66,300
Interest rate (as a percent)		5.50%			5.50%	5.50%			5.50%		5.50%		5.50%	5.50%
Conversion of notes through common stock issuance		69,808				14,600,000
Convertible Notes Payable						$ 33,500
Outstanding balance						$ 160
7.5% Convertible Senior Note
Earnings Per Share
Interest rate (as a percent)			7.50%									7.50%
Stock options
Earnings Per Share
Stock options granted					581,000		85,000
Warrant Transaction Agreements
Earnings Per Share
Shares of common stock that can be purchased from warrants issued (in shares)																	55,286,696	55,286,696
Number of warrants exercised (in shares)	4,534,130				9,214,449
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	55,286,696
Number of warrants exercised (in shares)					13,094,217	5,819,652
Series C redeemable convertible preferred stock
Earnings Per Share
Temporary Equity, Stock Issued During Period, Shares, New Issues				10,431
Stock options
Earnings Per Share
Number of dilutive potential common stock					9,020,891		19,803,872
Stock options granted					581,000		85,000
Restricted stock outstanding
Earnings Per Share
Number of dilutive potential common stock					6,416,308		4,600,227
Stock options granted					555,000		0
Warrant
Earnings Per Share
Number of dilutive potential common stock					88,264,726		110,573,392
Preferred stock
Earnings Per Share
Number of dilutive potential common stock							2,782,075
Convertible senior notes
Earnings Per Share
Number of dilutive potential common stock					39,170,766		59,133,896