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Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 0	$ 0	$ 0
State	436	476	454
Current income tax expense (benefit)	436	476	454
Deferred:
Federal	0	0	0
State	0	0	0
Deferred tax expense (benefit)	0	0	0
Income tax provision	$ 436	$ 476	$ 454

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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