Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Provision (benefit) for federal income taxes at statutory rates	$ (2,469)	$ (2,676)	$ (2,453)
Provision (benefit) for state income taxes, net of federal benefit	(106)	(564)	322
Valuation allowance changes affecting the provision for income taxes	19,002	(147)	(498)
Employment tax credits	(210)	(49)	(173)
Nondeductible expenses	122	1,899	401
Stock based compensation expense	80	15	(29)
Effect of Tax Cuts and Jobs Creation Act	0	0	4,514
Rate actualization	(1,349)	0	(36)
Other	624	41	486
Provision (benefit) for income taxes of continuing operations	$ 15,694	$ (1,481)	$ 2,534

Effective Income Tax Rate Reconciliation, Rate Actualization, Amount

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

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