Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - 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)		166
Exercise of stock warrants (in shares)		1,250
Common stock sold through ATM offering (in shares)		0
Common stock repurchased through business combination (in shares)							0
Tax withholding upon vesting of restricted stock (in shares)							47
Ending balance (in shares) at Mar. 31, 2018	28,866	32,048					3,182			127	555
Beginning balance at Dec. 31, 2017				$ 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				2,395					4,040
Exercise of stock warrants				50,562
Proceeds from sale of common stock, net of offering costs	$ 0			0
Other				(505)	0				505
Cumulative effect of change in accounting principle					5,040
Net loss attributable to stockholders of Overstock.com, Inc.	(50,909)				(50,909)
Net other comprehensive income	4					4
Common stock repurchased through business combination							0
Tax withholding upon vesting of restricted stock							2,354		(1,680)
Proceeds from security token offering, net	92,900								75,951
Net loss attributable to noncontrolling interests	(3,547)								(3,547)
Fair value of noncontrolling interest at acquisition									4,468
Ending balance at Mar. 31, 2018	$ 256,093	$ 3	$ 0	547,184	(300,561)	(595)	$ (66,170)	$ 179,861	76,232
Beginning balance (in shares) at Dec. 31, 2018		35,346					3,200
Increase (Decrease) in Stockholders' Equity
Common stock issued upon vesting of restricted stock (in shares)		242
Exercise of stock warrants (in shares)		0
Common stock sold through ATM offering (in shares)		2,214
Common stock repurchased through business combination (in shares)							47
Tax withholding upon vesting of restricted stock (in shares)							72
Ending balance (in shares) at Mar. 31, 2019	34,483	37,802					3,319			127	355
Beginning balance at Dec. 31, 2018	$ 210,706			657,981	(458,897)	(584)	$ (66,757)		78,960
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Stock-based compensation to employees and directors				3,985					0
Exercise of stock warrants				0
Proceeds from sale of common stock, net of offering costs	30,957			39,914
Other				(3)	425				(581)
Cumulative effect of change in accounting principle					0
Net loss attributable to stockholders of Overstock.com, Inc.	(39,244)				(39,244)
Net other comprehensive income	4					4
Common stock repurchased through business combination							(643)
Tax withholding upon vesting of restricted stock							1,353		0
Proceeds from security token offering, net									0
Net loss attributable to noncontrolling interests	(3,648)								(3,648)
Fair value of noncontrolling interest at acquisition									0
Ending balance at Mar. 31, 2019	$ 209,562	$ 3	$ 0	$ 701,877	$ (497,716)	$ (580)	$ (68,753)	$ 134,831	$ 74,731