Baudax Bio, Inc. Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Summary of Fair Value Assumptions Black Scholes Option Pricing Model (Details) $ in Thousands	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Schedule Of Capitalization Equity [Line Items]
Fair value	$ 83	$ 65
Series A Warrants
Schedule Of Capitalization Equity [Line Items]
Fair value	$ 42
Remaining contractual term	4 years
Series B Warrants
Schedule Of Capitalization Equity [Line Items]
Fair value	$ 41
Remaining contractual term	1 month 6 days
Expected Volatility \| Series A Warrants
Schedule Of Capitalization Equity [Line Items]
Fair value measurement warrant inputs	0.7625
Expected Volatility \| Series B Warrants
Schedule Of Capitalization Equity [Line Items]
Fair value measurement warrant inputs	0.5957
Risk Free Interest Rates \| Series A Warrants
Schedule Of Capitalization Equity [Line Items]
Fair value measurement warrant inputs	0.0064
Risk Free Interest Rates \| Series B Warrants
Schedule Of Capitalization Equity [Line Items]
Fair value measurement warrant inputs	0.0001