Income Taxes - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards which resulted in deferred tax assets	$ 42,122,000	$ 32,096,000
Unrecognized tax benefits	$ 0	0
Number of pending tax examinations | item	0
Accrued interest and penalties related to uncertain tax positions	$ 0	0
Interest and penalties recognized in statement of operations and comprehensive loss	0	$ 0
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	153,900,000
Net operating loss carryforwards which resulted in deferred tax assets	32,300,000
Net operating loss carryforwards subject to expiration	79,100,000
Net operating loss carried forward indefinitely	74,800,000
Federal | Research and Development Carryforward
Operating Loss Carryforwards [Line Items]
Research and development tax credit carryforwards	7,600,000
Research and development tax credit carryforwards subject to expiration	7,600,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	155,200,000
Net operating loss carryforwards subject to expiration	9,800,000
State | Research and Development Carryforward
Operating Loss Carryforwards [Line Items]
Research and development tax credit carryforwards	2,600,000
Research and development tax credit carryforwards subject to expiration	$ 2,000,000