Stockholders' Equity (Deficit) - At The Market Issuances (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Nov. 30, 2020	Mar. 31, 2021	Mar. 31, 2020
Stockholders' Equity (Deficit)
Number of shares sold by the entity		550,803	39,607
At-The-Market Issuance Sales Agreement
Stockholders' Equity (Deficit)
Number of shares sold by the entity		590,410
Value of shares sold by the entity		$ 72.8
Net proceeds after deducting commissions and other transactions costs		71.0
Remaining reserved amount under shelf registration		$ 127.2
Cowen & Co. LLC | At-The-Market Issuance Sales Agreement
Stockholders' Equity (Deficit)
Notice period of termination of sales agreement	10 days
Cowen & Co. LLC | Maximum | At-The-Market Issuance Sales Agreement
Stockholders' Equity (Deficit)
Maximum aggregate offering price	$ 200.0