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Subsequent Event - Additional Information (Detail) (USD $)
277 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Tranche One
Senior convertible notes due December 31, 2019
Deerfield
May 06, 2014
Subsequent Event
Tranche B notes
Apr. 02, 2014
Subsequent Event
Tranche One
Senior convertible notes due December 31, 2019
Deerfield
Apr. 02, 2014
Subsequent Event
Tranche One and Tranche Three
Senior convertible notes due December 31, 2019
Deerfield
Subsequent Event [Line Items]          
Amount of common shares issued upon conversion $ 3,331,000 $ 12,500,000   $ 7,500,000 $ 60,000,000
Common shares issued upon conversion   2,142,709   1,500,000 10,763,829
Principal amount of notes purchased     $ 20,000,000