Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax [Line Items]
Operating loss carryforwards	$ 71,300
Research & development tax credits	3,353	$ 2,902
Increase (decrease) in valuation allowance	$ 2,648	2,990
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	$ 19,000	$ 16,400
Deferred tax assets, operating loss carryforwards, subject to expiration	35,800
Deferred tax assets, operating loss carryforwards, not subject to expiration	35,500
Research and Development [Member]
Income Tax [Line Items]
Research & development tax credits	$ 3,400
Tax credit carryforward, expiration date	Dec. 31, 2028