Type	Name	Date
Underwriting agreement	Underwriting Agreement	02/10/2021
Underwriting agreement	Underwriting Agreement	12/18/2018
Securities purchase agreement	Securities Purchase Agreement	09/21/2011
Securities purchase agreement	Securities Purchase Agreement	10/06/2010
Registration rights agreement	Registration Rights Agreement	06/11/2010
Securities purchase agreement	Securities Purchase Agreement	06/11/2010