Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Operating Loss Carryforwards	$ 51,400
Deferred Tax Assets, Tax Credit Carryforwards, Research	2,070	$ 1,780
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 2,041	1,845
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2026
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			$ 4,900
Percentage of deferred tax assets that have been included in the valuation allowance	100.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 13,400	$ 11,400
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	35,800
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	15,600
Scenario, Plan [Member]
Income Tax [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
Research and Development [Member]
Income Tax [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 2,100
Tax Credit Carryforward, Expiration Date	Dec. 31, 2028