Stockholders' Equity - Common Stock and Warrants (Details) $ / shares in Units, $ in Thousands		1 Months Ended						2 Months Ended	12 Months Ended
	Apr. 13, 2020 USD ($)	Feb. 28, 2021 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) $ / shares shares	Nov. 30, 2020 USD ($) $ / shares shares	Aug. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Feb. 28, 2021 $ / shares shares	Dec. 31, 2021 USD ($) item $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2017 shares
Stockholders' equity
Preferred stock, Shares authorized									5,000,000.0
Preferred stock, par value | $ / shares									$ 0.01
Net proceeds from shares of common stock sold | $				$ 927,300	$ 344,400	$ 120,400	$ 23,500		$ 3,587,833	$ 1,271,714	$ 158,343
Common Stock Shares, Outstanding									577,654,900	458,051,401
Common Stock, Shares, Issued									594,729,610	473,977,469
Common stock, par value (in dollars per share) | $ / shares									$ 0.01	$ 0.01
Number of votes per share | item									1
Common stock shares issued				43,700,000	35,276,250	46,000,000	10,000,000	32.2
Share price (in dollars per share) | $ / shares				$ 22.25	$ 10.25	$ 2.75	$ 2.35				$ 2.75
Proceeds from exercise of warrants, net of transaction costs | $									$ 15,445		$ 14,089
Series A Junior Participating Cumulative Preferred Stock
Stockholders' equity
Preferred stock, par value | $ / shares									$ 0.01
Common Stock Shares, Outstanding									0	0
SK Holdings Co LTD
Stockholders' equity
Net proceeds from shares of common stock sold | $		$ 1,600,000
Common Stock, Shares, Issued		54,966,188						54,966,188
Common stock shares issued		54,996,188
Per share price of shares of common stock | $ / shares		$ 29.2893						$ 29.2893
At Market Issuance Sales Agreement
Stockholders' equity
Net proceeds from shares of common stock sold | $											$ 14,500
Common stock shares issued											6,300,000
Authorized amount | $	$ 75,000
Public Offerings
Stockholders' equity
Net proceeds from shares of common stock sold | $		$ 2,000,000	$ 2,000,000
Common stock shares issued		32,200,000	32,200,000
Share price (in dollars per share) | $ / shares		$ 65.00	$ 65.00					$ 65.00
Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017
Stockholders' equity
Number of warrants exercised (in shares)									75,655,478
Number of warrants were vested and exercisable										68,380,913
Maximum | Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017
Stockholders' equity
Class of Warrant or Right Issued												110,573,392