Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax [Line Items]
Operating Loss Carryforwards	$ 61,300
Deferred Tax Assets, Tax Credit Carryforwards, Research	2,902	$ 2,070
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 2,990	2,041
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2026
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Percentage of deferred tax assets that have been included in the valuation allowance	100.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 16,400	$ 13,400
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	35,800
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	25,500
Research and Development [Member]
Income Tax [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 2,900
Tax Credit Carryforward, Expiration Date	Dec. 31, 2028