Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 0	$ 0	$ 0
Valuation allowance	(20,797,000)	(5,736,000)
Valuation allowance increase	(15,100,000)
Accrued interest or penalties related to uncertain tax positions	$ 0	$ 0	$ 0