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Fair Value Measurements (Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Liabilities:    
Warrants potentially settleable in cash $ 16,661 $ 5,383
Unobservable Inputs (Level 3) [Member]    
Liabilities:    
Contingent purchase price consideration 6,582 6,651
Fair Value, Measurements, Recurring [Member]    
Assets:    
Cash equivalents 32,618 19,477
Assets held for sale 17,801  
Total assets 50,419 19,477
Liabilities:    
Warrants potentially settleable in cash 16,661 5,383
Contingent purchase price consideration 6,582 6,651
Total liabilities 23,243 12,034
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]    
Assets:    
Cash equivalents 32,618 19,477
Assets held for sale 0  
Total assets 32,618 19,477
Liabilities:    
Warrants potentially settleable in cash 0 0
Contingent purchase price consideration 0 0
Total liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Cash equivalents 0 0
Assets held for sale 0  
Total assets 0 0
Liabilities:    
Warrants potentially settleable in cash 16,661 5,383
Contingent purchase price consideration 0 0
Total liabilities 16,661 5,383
Fair Value, Measurements, Recurring [Member] | Unobservable Inputs (Level 3) [Member]    
Assets:    
Cash equivalents 0 0
Assets held for sale 17,801  
Total assets 17,801 0
Liabilities:    
Warrants potentially settleable in cash 0 0
Contingent purchase price consideration 6,582 6,651
Total liabilities $ 6,582 $ 6,651