Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Government grant advance	$ 3,378,000	$ 0
Income tax expense	1,938,000	91,000
Deferred tax assets valuation allowance	29,451,000	18,562,000
Valuation allowance increase (decrease)	10,900,000
Increase (decrease) related to changes in deferred taxes	14,800,000
Valuation allowance, net operating loss	$ 3,900,000
Net operating loss, limited to percentage of taxable income, percentage of income	80.00%
Change in ownership percentage (more than)	50.00%
Loss carryforwards, limitation on use	$ 28,000
Unrecognized tax benefits	2,331,000	0	$ 0
Unrecognized tax benefits that would impact effective tax rate	2,300,000
Unrecognized tax benefits, income tax penalties and interest expense	500,000
Minimum | Subject to Limitations
Operating Loss Carryforwards [Line Items]
Net operating losses	10,700,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 10,706,000	$ 48,531,000