Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenue	$ 40,280	$ 47,980
Fee revenue	20,863	22,816
Total revenue	61,143	70,796
Costs and expenses from operations:
Cost of goods sold	27,631	32,271
Seller distributions	3,312	4,548
Technology and operations	18,100	21,892
Sales and marketing	8,310	9,987
General and administrative	7,572	9,857
Depreciation and amortization	1,211	1,429
Other operating expenses (income)	1,459	(928)
Total costs and expenses	67,595	79,056
Loss from operations	(6,452)	(8,260)
Interest and other (income) expense, net	(425)	34
Loss before provision for income taxes	(6,027)	(8,294)
(Benefit) provision for income taxes	(4,815)	103
Net loss	$ (1,212)	$ (8,397)
Basic and diluted loss per common share (USD per share)	$ (0.04)	$ (0.27)
Basic and diluted weighted average shares outstanding (in shares)	31,876,603	31,261,603