Type	Name	Date
Underwriting agreement	Underwriting Agreement	11/05/2018
Underwriting agreement	Underwriting Agreement	02/13/2018
Underwriting agreement	Underwriting Agreement	07/29/2016
Underwriting agreement	Underwriting Agreement	03/28/2013
Registration rights agreement	Registration Rights Agreement, by and among the Registrant and the Purchasers listed therein	10/05/2006
Registration rights agreement	Registration Rights Agreement, by and among the Registrant and the Purchasers listed therein	10/05/2006
Registration rights agreement	Registration Rights Agreement, by and among the Registrant and the Purchasers listed therein	01/31/2005