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Income Taxes, Valuation Allowance, Operating Loss Carryforwards and Tax Credit Carry-forwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Net change in valuation allowance	$ 1,816
Income Taxes [Abstract]
Net operating loss carryforwards	19,573	$ 25,403
Federal [Member]
Income Taxes [Abstract]
Net operating loss carryforwards	$ 131,055
Operating loss carryforwards, expiration dates	Dec. 31, 2028
Federal [Member] | Research and Development [Member]
Tax credit carryforwards [Abstract]
Tax credit carryforwards	$ 1,730
Federal tax credit carryforward, expiration dates	Dec. 31, 2032
State [Member]
Income Taxes [Abstract]
Net operating loss carryforwards	$ 107,989
Operating loss carryforwards, expiration dates	Dec. 31, 2029

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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