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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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Exercise price per share or per unit of warrants or rights outstanding.

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

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Number of shares issued during the period as a result of the conversion of convertible securities.

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Earnings Per Share - Anti-dilutive Shares (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		3 Months Ended
	Nov. 01, 2018	May 16, 2013	Dec. 31, 2017	Apr. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 08, 2018	Jul. 31, 2017	Jul. 20, 2017	Apr. 04, 2017
Earnings Per Share
Number of dilutive potential common shares					200,870,098	182,204,967
Exercise price of warrants (in dollars per share)									$ 2.1231
Convertible Senior Notes
Earnings Per Share
Principal amount					$ 100,000	$ 100,000	$ 100,000
Interest rate (as a percent)						5.50%
Warrants issued in April 2017
Earnings Per Share
Number of warrants issued (in shares)				5,250,750
Exercise price of warrants (in dollars per share)				$ 2.69	$ 0
Warrants issued with the Amazon.com, Inc transaction agreement
Earnings Per Share
Exercise price of warrants (in dollars per share)					0
Shares of common stock that can be purchased from warrants issued (in shares)										55,286,696
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
Warrants issued with the Walmart transaction agreement
Earnings Per Share
Exercise price of warrants (in dollars per share)					$ 0
Shares of common stock that can be purchased from warrants issued (in shares)								55,286,696
Series C redeemable convertible preferred stock
Earnings Per Share
Stock options granted		10,431
Shares issued upon conversion of redeemable stock (in shares)			7,811
Series E redeemable convertible preferred stock
Earnings Per Share
Shares issued upon conversion of redeemable stock (in shares)	35,000
Stock options
Earnings Per Share
Number of dilutive potential common shares					21,109,998	19,733,986
Stock options granted					25,000	0
Restricted stock
Earnings Per Share
Number of dilutive potential common shares					2,372,347	234,744
Stock options granted					25,000	0
Warrants
Earnings Per Share
Number of dilutive potential common shares					115,824,142	115,824,142
Preferred stock
Earnings Per Share
Number of dilutive potential common shares					17,933,591	2,782,075
Convertible Senior Notes
Earnings Per Share
Number of dilutive potential common shares					43,630,020	43,630,020