Basis of Presentation and Summary of Significant Accounting Policies - Net Loss Per Share (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Potentially dilutive securities have been excluded from the computation of diluted weighted average shares of common stock outstanding
Securities have been excluded from the computation of diluted weighted average shares of common stock outstanding (in shares)	3,819,566	2,732,059
Stock options
Potentially dilutive securities have been excluded from the computation of diluted weighted average shares of common stock outstanding
Securities have been excluded from the computation of diluted weighted average shares of common stock outstanding (in shares)	3,754,176	2,588,235
Common stock warrants
Potentially dilutive securities have been excluded from the computation of diluted weighted average shares of common stock outstanding
Securities have been excluded from the computation of diluted weighted average shares of common stock outstanding (in shares)	17,125	17,125
BSA and BSPCE warrants
Potentially dilutive securities have been excluded from the computation of diluted weighted average shares of common stock outstanding
Securities have been excluded from the computation of diluted weighted average shares of common stock outstanding (in shares)	48,265	126,699