Quarterly report pursuant to Section 13 or 15(d)

Intangibles - Additional Information (Detail)

v3.8.0.1
Intangibles - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Aug. 01, 2017
May 18, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Finite Lived Intangible Assets [Line Items]            
Intangible assets, Fair Value $ 8,600,000 $ 3,100,000        
Intangible assets, Useful life 6 years 14 years        
Loss on disposition [note 4]     $ 8,610,000   $ 8,610,000  
Recovery of deferred income taxes [note 4]     2,928,000 $ 137,000 3,051,000 $ 377,000
License agreement amortization expense     $ 100,000 $ 100,000 200,000 $ 200,000
Impairment of intangible assets         0  
Apatorsen License Agreements [Member]            
Finite Lived Intangible Assets [Line Items]            
Loss on disposition [note 4]         8,600,000  
Recovery of deferred income taxes [note 4]         $ 2,900,000