Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Bristol-Myers Squibb [Member]	Common Shares [Member]	Common Shares [Member] Bristol-Myers Squibb [Member]	Capital in Excess of Par Value [Member]	Capital in Excess of Par Value [Member] Bristol-Myers Squibb [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Accumulated Other Comprehensive Income/(Loss) [Member] Bristol-Myers Squibb [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Bristol-Myers Squibb [Member]
Beginning Balance at Dec. 31, 2015	$ 6,429		$ 13		$ 1,876,072		$ (2,170)		$ (1,867,486)
Beginning Balance, Shares at Dec. 31, 2015			135,289
Sale of stock	189,276		$ 2		189,274		0		0
Sale of stock, Shares			14,950
Shares issued under equity compensation plans	20,287		$ 0		20,287		0		0
Shares issued under equity compensation plans, Shares			2,973
Stock-based compensation	25,850		$ 0		25,850		0		0
Other comprehensive loss	(193)		0		0		(193)		0
Net loss	(153,524)		0		0		0		(153,524)
Ending Balance at Dec. 31, 2016	88,125		$ 15		2,111,483		(2,363)		(2,021,010)
Ending Balance, Shares at Dec. 31, 2016			153,212
Shares issued under equity compensation plans	59,528		$ 0		59,528		0		0
Shares issued under equity compensation plans, Shares			6,312
Stock-based compensation	36,615		$ 0		36,615		0		0
Other comprehensive loss	252		0		239		252		(239)
Net loss	(96,692)		0		0		0		(96,692)
Ending Balance at Dec. 31, 2017	87,828		$ 15		2,207,865		(2,111)		(2,117,941)
Ending Balance, Shares at Dec. 31, 2017			159,524
Sale of stock		$ 790,232		$ 1		$ 790,231		$ 0		$ 0
Sale of stock, Shares				8,285
Shares issued under equity compensation plans	61,729		$ 1		61,728		0		0
Shares issued under equity compensation plans, Shares			5,721
Stock-based compensation	88,101		$ 0		88,101		0		0
Adoption of new accounting standards	12,577		0		0		0		12,577
Other comprehensive loss	(4,205)		0		0		(4,205)		0
Net loss	681,313		0		0		0		681,313
Ending Balance at Dec. 31, 2018	$ 1,717,575		$ 17		$ 3,147,925		$ (6,316)		$ (1,424,051)
Ending Balance, Shares at Dec. 31, 2018			173,530