Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Income Taxes
Liability recorded for unrecognized tax benefits	$ 0	$ 0
Gross deferred tax assets	42,926	32,622
Valuation allowance	42,926	32,606
Net deferred tax liability		$ 16
Credits or net operating losses	$ 0