Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net of underwriting discounts, commissions and offering expenses	$ 10,903
Series D Redeemable Convertible Preferred Stock [Member]
Issuance of redeemable convertible preferred stock, net of financing cost		$ 10