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Discontinued Operations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Apr. 03, 2013
PPDS Technology [Member]
Dec. 24, 2012
PPDS Technology [Member]
Dec. 31, 2012
PPDS Technology [Member]
Dec. 24, 2012
PPDS Technology [Member]
Sep. 24, 2012
Visudyne [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash proceeds received from sale of a subsidiary         $ 112.5
Term of Mati's purchase option to acquire QLT's PPDS Technology   90 days 90 days    
Consideration received related to Mati's exercise of purchase option to acquire QLT's PPDS Technology   0.5      
Deferred income       0.5  
Contingent consideration potentially receivable upon completion of certain product development and commercialization milestones       19.5  
Additional payment received from exercise of option to acquire assets $ 0.8