BUSINESS COMBINATIONS Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands			3 Months Ended
	Jan. 01, 2019	Jun. 25, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Purchase Price
Cash paid, net of cash acquired			$ (4,885)	$ 11,769
Allocation
Goodwill			$ 25,434		$ 22,895
Mac Warehouse, LLC
Purchase Price
Cash paid, net of cash acquired		$ 1,143
Allocation
Accounts receivable, net		399
Inventories, net		1,033
Prepaids and other current assets		29
Property and equipment		154
Intangibles		653
Accounts payable and accrued liabilities		(1,432)
Long-term debt, net		(3,069)
Goodwill		3,376
Total net assets, net of cash acquired		$ 1,143
tZero.com, Inc. | Bitsy, Inc.
Purchase Price
Cash paid, net of cash acquired	$ 3,115
Fair value of equity interest in Bitsy held before business combination	3,707
Less: Fair value of Overstock.com common stock held by Bitsy at acquisition date	(643)
Less: Settlement of receivable due from tZERO at acquisition date	(10)
Total transaction consideration, net of cash acquired	6,169
Allocation
Prepaids and other current assets	71
Property and equipment	16
Intangibles	6,743
Other liabilities assumed	(661)
Total net assets, net of cash acquired	$ 6,169