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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Liabilities    
Warrants to purchase common stock $ 5,208 $ 0
Recurring [Member]    
Assets    
Money market funds 14,497 28,774
Liabilities    
Contingent consideration 492 948
Warrants to purchase common stock 5,208  
Total liabilities 5,700  
Fair Value Measured Using - (Level 1) [Member] | Recurring [Member]    
Assets    
Money market funds 14,497 28,774
Liabilities    
Contingent consideration 0 0
Warrants to purchase common stock 0  
Total liabilities 0  
Fair Value Measured Using - (Level 2) [Member] | Recurring [Member]    
Assets    
Money market funds 0 0
Liabilities    
Contingent consideration 0 0
Warrants to purchase common stock 0  
Total liabilities 0  
Fair Value Measured Using - (Level 3) [Member] | Recurring [Member]    
Assets    
Money market funds 0 0
Liabilities    
Contingent consideration 492 $ 948
Warrants to purchase common stock 5,208  
Total liabilities $ 5,700