Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

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Income Taxes - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Dec. 31, 2015
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]      
Provision for income taxes   $ 0 $ 0
Research and development tax credit utilized as reduction of payroll expenses   $ 154,000 $ 156,000
Research and development tax credit utilized against employer's portion of payroll tax $ 250,000