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167 - Disclosure - Future Tax Benefits (Deferred Tax Assets) (Detail)
(http://www.achillion.com/taxonomy/role/DisclosureFutureTaxBenefitsDeferredTaxAssets)
TableDeferred Income Benefit Taxes [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001070336 (http://www.sec.gov/CIK)
Legal Entity [Axis]Entity [Domain]
Deferred Tax Assets And Liabilities [Line Items]Period [Axis]
2016-12-31
2015-12-31
Gross deferred tax assets:
 
 
Net operating losses
127,376,000  
151,076,000  
Tax credits (federal and state)
10,758,000  
12,977,000  
Share-based compensation
10,725,000  
7,643,000  
Other
24,000  
419,000  
Gross deferred income tax asset
148,883,000  
 
172,115,000  
 
Less-valuation allowance
(148,883,000) 
(172,115,000) 
Net deferred tax asset
0  
 
0