Income Taxes - Net operating losses (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 4,300	$ 2,900	$ 1,800
NOLs, annual limitations on use	71
Federal
Operating Loss Carryforwards [Line Items]
Net operating losses	1,100	900
NOLs, annual limitations on use	32,300
NOLs, without regard to this permanent write-off	31,500
State
Operating Loss Carryforwards [Line Items]
Net operating losses	3,200	2,000
NOLs, annual limitations on use	14,000
NOLs, without regard to this permanent write-off	13,200
Foreign
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 0	$ 0