Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Loss before income taxes	$ 29,000,000	$ 24,100,000	$ 16,100,000
Deferred income tax expense or benefit	0	0	0
Current Income Tax Expense (Benefit)	0	0	$ 0
Increase in valuation allowance	9,000,000	$ 6,400,000
Accrued interest or penalties related to uncertain tax positions	0
Interest or penalties related to uncertain tax positions recognized in statements of operations and comprehensive loss	$ 0
Deferred tax asset revaluation percentage	21.00%	21.00%	34.00%
Maximum
Income Taxes [Line Items]
Deferred tax asset revaluation percentage			35.00%