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Discontinued Operations - Summary of Significant Non-Cash Items and Purchases of Property, Plant and Equipment on Cash Flows (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Adjustments to reconcile net loss to net cash used in operating activities |  |
Depreciation and amortization | $ 9,593 | $ 12,690
Unrealized and realized (appreciation) depreciation on equity securities and preferred stock, net | 106 | (5,702)
Equity in net loss of EnviroFlight | 640 | 3,387
Stock-based compensation expense | 9,269 | 9,115
Deferred income taxes | (136) | (981)
Gain on sale of discontinued operations | (672) | 0
Loss on release of cumulative foreign currency translation adjustment | 26,957 | 0
Cash flows from investing activities |  |
Purchases of property, plant and equipment | (5,034) | (25,423)
TS Biotechnology Holdings LLC and EnviroFlight LLC | Discontinued Operations, Held-for-sale |  |
Adjustments to reconcile net loss to net cash used in operating activities |  |
Depreciation and amortization | 0 | 2,483
Unrealized and realized (appreciation) depreciation on equity securities and preferred stock, net | 106 | 507
Equity in net loss of EnviroFlight | 38 | 1,923
Stock-based compensation expense | (1,346) | 1,351
Deferred income taxes | 0 | (935)
Gain on sale of discontinued operations | (672) | 0
Loss on release of cumulative foreign currency translation adjustment | 26,957 | 0
Cash flows from investing activities |  |
Purchases of property, plant and equipment | $ (382) | $ (18,275)

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