Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Preferred stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive loss	Treasury stock	Parent	Noncontrolling interest	Series A Preferred Stock Preferred stock	Series B Preferred Stock Preferred stock
Beginning balance (in shares) at Dec. 31, 2017		30,632					3,135
Increase (Decrease) in Stockholders' Equity
Common stock issued upon vesting of restricted stock (in shares)		221
Common stock issued for asset purchase (in shares)		100
Exercise of stock warrants (in shares)		1,250
Purchase of treasury stock (in shares)							61
Ending balance (in shares) at Jun. 30, 2018	29,007	32,203					3,196			127	555
Beginning balance at Dec. 31, 2017	$ 172,123			$ 494,732	$ (254,692)	$ (599)	$ (63,816)		$ (3,505)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Stock-based compensation to employees and directors				5,368					4,040
Common stock issued for asset purchase				2,930
Cumulative effect of change in accounting principle					5,040
Tax withholding upon vesting of restricted stock									(1,680)
Exercise of stock warrants				50,562
Sale of stock warrants				25
Proceeds from security token offering, net of offering costs									78,442
Net loss attributable to stockholders of Overstock.com, Inc.	(115,820)				(115,820)
Net other comprehensive income	8					8
Tax withholding upon vesting of restricted stock							(2,846)
Net loss attributable to noncontrolling interests	(4,552)								(4,552)
Fair value of noncontrolling interests at acquisition									4,468
Other				(505)					505
Ending balance at Jun. 30, 2018	$ 198,108	$ 3	$ 0	$ 553,112	$ (365,472)	$ (591)	$ (66,662)	$ 120,390	$ 77,718