Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total USD ($)	February 2007 Financing [Member] USD ($)	Warrant [Member] USD ($)	Settlement of Advances [Member] USD ($)	Initial Public Offering [Member] USD ($)	Other [Member] USD ($)	Series A Special Warrants [Member] USD ($)	Rights [Member] USD ($)	Oxiquant [Member] USD ($)	Consultants [Member] USD ($)	Financing Warrant [Member] USD ($)	Convertible Notes Payable [Member] June 2004 Convertible Notes [Member] USD ($)	Convertible Notes Payable [Member] December 2004 Convertible Notes [Member] USD ($)	Nonredeemable Preferred Stock [Member] USD ($)	Private Placement [Member]	Private Placement [Member] December 2004 Placement [Member] USD ($)	Private Placement [Member] May 2004 Placement [Member] USD ($)	Private Placement [Member] July 2005 Placement [Member] USD ($)	Private Placement [Member] May 2006 Placement [Member] USD ($)	Employees [Member] USD ($)	Cadherin Biomedical Inc. [Member] USD ($)	Common Stock [Member] USD ($)	Common Stock [Member] February 2007 Financing [Member] USD ($)	Common Stock [Member] April 2010 Financing [Member]	Common Stock [Member] Warrant [Member] USD ($)	Common Stock [Member] Settlement of Advances [Member] USD ($)	Common Stock [Member] Initial Public Offering [Member] USD ($)	Common Stock [Member] Other [Member] USD ($)	Common Stock [Member] Series A Special Warrants [Member] USD ($)	Common Stock [Member] Rights [Member] USD ($)	Common Stock [Member] Oxiquant [Member] USD ($)	Common Stock [Member] Convertible Notes Payable [Member] June 2004 Convertible Notes [Member] USD ($)	Common Stock [Member] Convertible Notes Payable [Member] December 2004 Convertible Notes [Member] USD ($)	Common Stock [Member] Private Placement [Member] December 2004 Placement [Member] USD ($)	Common Stock [Member] Private Placement [Member] May 2004 Placement [Member] USD ($)	Common Stock [Member] Private Placement [Member] July 2005 Placement [Member] USD ($)	Common Stock [Member] Private Placement [Member] May 2006 Placement [Member] USD ($)	Common Stock [Member] Cadherin Biomedical Inc. [Member] USD ($)	Non-redeemable Preferred Stock of Subsidiary [Member] USD ($)	Non-redeemable Preferred Stock of Subsidiary [Member] Nonredeemable Preferred Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Additional Paid-in Capital [Member] February 2007 Financing [Member] USD ($)	Additional Paid-in Capital [Member] Warrant [Member] USD ($)	Additional Paid-in Capital [Member] Series A Special Warrants [Member] USD ($)	Additional Paid-in Capital [Member] Rights [Member] USD ($)	Additional Paid-in Capital [Member] Oxiquant [Member] USD ($)	Additional Paid-in Capital [Member] Consultants [Member] USD ($)	Additional Paid-in Capital [Member] Financing Warrant [Member] USD ($)	Additional Paid-in Capital [Member] Convertible Notes Payable [Member] June 2004 Convertible Notes [Member] USD ($)	Additional Paid-in Capital [Member] Convertible Notes Payable [Member] December 2004 Convertible Notes [Member] USD ($)	Additional Paid-in Capital [Member] Private Placement [Member] December 2004 Placement [Member] USD ($)	Additional Paid-in Capital [Member] Private Placement [Member] May 2004 Placement [Member] USD ($)	Additional Paid-in Capital [Member] Private Placement [Member] July 2005 Placement [Member] USD ($)	Additional Paid-in Capital [Member] Private Placement [Member] May 2006 Placement [Member] USD ($)	Additional Paid-in Capital [Member] Employees [Member] USD ($)	Accumulated Other Comprehensive Income [Member] USD ($)	Deficit Accumulated During Development Stage [Member] USD ($)	Deficit Accumulated During Development Stage [Member] Initial Public Offering [Member] USD ($)	Deficit Accumulated During Development Stage [Member] Rights [Member] USD ($)
Beginning Balance at Sep. 03, 1996
Issuance of stock (in shares)																						89
Net (loss) income	$ (37)																																																								$ (37)
Ending Balance at Jun. 30, 1997	(37)																																																								(37)
Ending Balance (in shares) at Jun. 30, 1997																						89
Net (loss) income	(398)																																																								(398)
Ending Balance at Jun. 30, 1998	(435)																																																								(435)
Beginning Balance (in shares) at Jun. 30, 1998																						89
Exchange of Adherex Inc. shares for Adherex Technologies Inc. shares (in shares)																						(89)
Issuance of stock (in shares)																						239
Issuance of stock	1,615																					1,615
Cumulative translation adjustment	20																																																							20
Net (loss) income	(958)																																																								(958)
Ending Balance at Jun. 30, 1999	242																					1,615																																		20	(1,393)
Ending Balance (in shares) at Jun. 30, 1999																						239
Issuance of warrants			255																																								255
Issuance of stock (in shares)																						16				16
Issuance of stock	793			175																		793				175
Issuance of equity rights	171																																								171
Cancellation of common stock (in shares)																										(7)
Cumulative translation adjustment	16																																																							16
Net (loss) income	(1,605)																																																								(1,605)
Ending Balance at Jun. 30, 2000	47																					2,583																			426															36	(2,998)
Ending Balance (in shares) at Jun. 30, 2000																						264
Issuance of warrants			1,722				4,335																																				1,722	4,335
Issuance of stock (in shares)																											74	5
Issuance of stock					5,689	341																					5,727	341																														(38)
Conversion of convertible securities (in shares)																									30				69	4
Conversion of convertible securities																									1,977				4,335	171													(1,977)	(4,335)	(171)
Cumulative translation adjustment	182																																																							182
Net (loss) income	(2,524)																																																								(2,524)
Ending Balance at Jun. 30, 2001	9,792																					15,134																																		218	(5,560)
Ending Balance (in shares) at Jun. 30, 2001																						446
Cumulative translation adjustment	11																																																							11
Net (loss) income	(3,732)																																																								(3,732)
Ending Balance at Jun. 30, 2002	6,071																					15,134																																		229	(9,292)
Beginning Balance (in shares) at Jun. 30, 2002																						446
Issuance of warrants											53																																					53
Stock options issued										4																																					4
Stock Issued for Acquisitions (in shares)																															446
Stock Issued for Acquisitions									11,620																						11,077															543
Equity component of convertible notes	1,058																																								1,058
Exercise of stock options (in shares)																						1
Exercise of stock options	4																					4
Distribution to shareholders	(158)																																																								(158)
Stated capital reduction																						(9,489)																			9,489
Cumulative translation adjustment	(159)																																																							(159)
Net (loss) income	(17,795)																																																								(17,795)
Ending Balance at Jun. 30, 2003	698																					16,726																			11,147															70	(27,245)
Ending Balance (in shares) at Jun. 30, 2003																						893
Repricing of warrants related to financing										18																																					18
Issuance of warrants											54																																					54
Stock options issued										148																																					148
Equity component of convertible notes	1,983																																								1,983
Issuance of stock (in shares)																																		640	259
Issuance of stock														1,045		13,830	8,474																	8,053	6,356					1,045											5,777	2,118
Conversion of convertible securities (in shares)																																96	60
Conversion of convertible securities												1,123	171																			1,216	569																(93)	(398)
Exercise of stock options (in shares)																						1
Exercise of stock options	23																					23
Amalgamation of 2037357 Ontario Inc.	(22)																					660																	(1,045)		363
Amalgamation of 2037357 Ontario Inc., shares																						44
Cumulative translation adjustment	(219)																																																							(219)
Net (loss) income	(6,872)																																																								(6,872)
Ending Balance at Jun. 30, 2004	20,454																					33,603																			21,117															(149)	(34,117)
Ending Balance (in shares) at Jun. 30, 2004																						1,993
Cost related to SEC registration	(493)																					(493)
Stock options issued										39										604																											39								604
Stock Issued for Acquisitions (in shares)																																						37
Stock Issued for Acquisitions																					1,252																	1,252
Cumulative translation adjustment	1,392																																																							1,392
Net (loss) income	(6,594)																																																								(6,594)
Ending Balance at Dec. 31, 2004	16,654																					34,362																			21,760															1,243	(40,711)
Ending Balance (in shares) at Dec. 31, 2004																						2,030
Financing costs	(141)																					(141)
Stock options issued										276																																					276
Issuance of stock (in shares)																																				337
Issuance of stock																		8,134																		7,060																	1,074
Exercise of stock options (in shares)																						1
Exercise of stock options	25																					25
Net (loss) income	(13,871)																																																								(13,871)
Ending Balance at Dec. 31, 2005	11,077																					41,306																			23,110															1,243	(54,582)
Ending Balance (in shares) at Dec. 31, 2005																						2,368
Stock options issued										100										491																											100								491
Issuance of stock (in shares)																																					431
Issuance of stock																			6,040																		5,218																	822
Net (loss) income	(16,440)																																																								(16,440)
Ending Balance at Dec. 31, 2006	1,268																					46,524																			24,523															1,243	(71,022)
Beginning Balance (in shares) at Dec. 31, 2006																						2,799
Exercise of warrants (in shares)																						116
Exercise of warrants	694																					563																			131
Stock options issued										59										2,263																											59								2,263
Issuance of stock (in shares)																							4,209
Issuance of stock		23,221																					17,842																			5,379
Net (loss) income	(13,357)																																																								(13,357)
Ending Balance at Dec. 31, 2007	14,148																					64,929																			32,355															1,243	(84,379)
Ending Balance (in shares) at Dec. 31, 2007																						7,124
Stock options issued										88										2,417																											88								2,417
Net (loss) income	(13,600)																																																								(13,600)
Ending Balance at Dec. 31, 2008	3,053																					64,929																			34,860															1,243	(97,979)
Ending Balance (in shares) at Dec. 31, 2008																						7,124
Stock options issued										10										355																											10								355
Net (loss) income	(3,012)																																																								(3,012)
Ending Balance at Dec. 31, 2009	406																					64,929																			35,225															1,243	(100,991)
Ending Balance (in shares) at Dec. 31, 2009																						7,124
Stock options issued										53										2,439																											53								2,439
Issuance of stock (in shares)																								13,337
Net (loss) income	(7,823)																																																								(7,823)
Ending Balance at Dec. 31, 2010	(4,924)																					64,929																			37,717															1,243	(108,815)
Ending Balance (in shares) at Dec. 31, 2010																						20,461
Stock options issued										20										129																											20								129
Issuance of stock (in shares)																														4,697
Issuance of stock								(28)																						1,023															199														(1,250)
Net (loss) income	4,685																																																								4,685
Ending Balance at Dec. 31, 2011	(120)																					65,952																			38,065															1,243	(105,380)
Ending Balance (in shares) at Dec. 31, 2011																						25,158
Stock options issued										152										174																											152								174
Net (loss) income	(5,163)																																																								(5,163)
Ending Balance at Dec. 31, 2012	(4,957)																					65,952																			38,391															1,243	(110,543)
Ending Balance (in shares) at Dec. 31, 2012																						25,158
Net (loss) income	(4,108)																																																								(4,108)
Ending Balance at Mar. 31, 2013	$ (9,065)																					$ 65,952																			$ 38,391															$ 1,243	$ (114,651)
Ending Balance (in shares) at Mar. 31, 2013																						25,158