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Discontinued Operations - Summary of Financial Data for Equity Method Investments Included in Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Current assets $ 172,995   $ 172,995   $ 234,643
Total assets 361,715   361,715   455,763
Current liabilities 64,100   64,100   122,912
Total liabilities 312,173   312,173   384,052
Net loss $ (43,354) $ (38,931) (99,352) $ (101,067)  
Equity Method Investment, Nonconsolidated Investee or Group of Investees | EnviroFlight Sale | Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Current assets         703
Noncurrent assets         30,549
Total assets         31,252
Current liabilities         2,352
Non-current liabilities         88
Total liabilities         2,440
Net assets         $ 28,812
Revenues   130 16 224  
Operating expenses   2,200 92 4,081  
Operating loss   (2,070) (76) (3,857)  
Other income (expense), net   8 0 12  
Net loss   $ (2,062) $ (76) $ (3,845)