Segment Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 65,520,000	$ 85,188,000	$ 208,650,000	$ 237,941,000
Acquisition costs	0	0	0	(39,000)
(Provision) benefit for income taxes	(41,000)	17,000	(91,000)	2,438,000
Net loss	(8,614,000)	(124,000)	(25,220,000)	(6,171,000)
Assets	231,566,000		231,566,000		$ 260,109,000
Operating Segments | GovDeals
Segment Reporting Information [Line Items]
Revenue	7,464,000	6,420,000	19,901,000	17,067,000
Gross profit	7,023,000	6,041,000	18,670,000	16,040,000
Assets	37,965,000		37,965,000		38,828,045
Operating Segments | CAG
Segment Reporting Information [Line Items]
Revenue	34,400,000	54,199,000	113,978,000	146,692,000
Gross profit	17,418,000	29,352,000	56,961,000	85,171,000
Assets	102,967,000		102,967,000		117,870,348
Operating Segments | RSCG
Segment Reporting Information [Line Items]
Revenue	23,528,000	23,804,000	72,029,000	67,818,000
Gross profit	7,398,000	7,675,000	22,566,000	22,176,000
Assets	30,991,000		30,991,000		0
Corporate and Other
Segment Reporting Information [Line Items]
Revenue	128,000	765,000	2,742,000	6,364,000
Gross profit	(1,921,000)	164,000	(1,492,000)	926,000
Assets	59,643,000		59,643,000		$ 103,410,750
Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenue	65,520,000	85,188,000	208,650,000	237,941,000
Gross profit	29,918,000	43,232,000	96,705,000	124,313,000
Operating Expenses	(36,663,000)	(41,549,000)	(116,853,000)	(128,177,000)
Depreciation/Amortization	(1,365,000)	(1,616,000)	(4,228,000)	(4,948,000)
Acquisition costs	0	0		39,000
Other operating expense	(652,000)	0	(1,044,000)	0
Interest income/(expense) and other expense, net	189,000	(208,000)	291,000	242,000
(Provision) benefit for income taxes	$ (41,000)	$ 17,000	$ (91,000)	$ 2,438,000