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Fair Value Measurements (Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Liabilities:    
Warrants potentially settleable in cash $ 9,264 $ 14,518
Unobservable Inputs (Level 3) [Member]    
Liabilities:    
Contingent purchase price consideration 815 6,142
Fair Value, Measurements, Recurring [Member]    
Assets:    
Cash equivalents 18,169 29,171
Total assets 18,169 29,171
Liabilities:    
Warrants potentially settleable in cash 9,264 14,518
Contingent purchase price consideration 815 6,142
Total liabilities 10,079 20,660
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]    
Assets:    
Cash equivalents 18,169 29,171
Total assets 18,169 29,171
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
Total assets 0 0
Liabilities:    
Warrants potentially settleable in cash 9,264 14,518
Contingent purchase price consideration 0 0
Total liabilities 9,264 14,518
Fair Value, Measurements, Recurring [Member] | Unobservable Inputs (Level 3) [Member]    
Assets:    
Cash equivalents 0 0
Total assets 0 0
Liabilities:    
Warrants potentially settleable in cash 0 0
Contingent purchase price consideration 815 6,142
Total liabilities $ 815 $ 6,142