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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets:        
Cash equivalents   $ 17,583    
Liabilities:        
Warrants potentially settleable in cash $ 8,510 1,860 $ 14,518  
Unobservable Inputs (Level 3)        
Liabilities:        
Contingent purchase price consideration 1,227 1,095 6,142 $ 6,651
Fair Value, Measurements, Recurring        
Assets:        
Cash equivalents 17,131 16,192 29,171  
Restricted cash equivalents 13,212 17,622    
Total assets 30,343 33,814 29,171  
Liabilities:        
Warrants potentially settleable in cash 8,510 1,860 14,518  
Contingent purchase price consideration 1,227 1,095 6,142  
Total liabilities 9,737 2,955 20,660  
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets (Level 1)        
Assets:        
Cash equivalents 17,131 16,192 29,171  
Restricted cash equivalents 13,212 17,622    
Total assets 30,343 33,814 29,171  
Liabilities:        
Warrants potentially settleable in cash 0 0 0  
Contingent purchase price consideration 0 0 0  
Total liabilities 0 0 0  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)        
Assets:        
Cash equivalents 0 0 0  
Restricted cash equivalents 0 0    
Total assets 0 0 0  
Liabilities:        
Warrants potentially settleable in cash 8,510 1,860 14,518  
Contingent purchase price consideration 0 0 0  
Total liabilities 8,510 1,860 14,518  
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)        
Assets:        
Cash equivalents 0 0 0  
Restricted cash equivalents 0 0    
Total assets 0 0 0  
Liabilities:        
Warrants potentially settleable in cash 0 0 0  
Contingent purchase price consideration 1,227 1,095 6,142  
Total liabilities $ 1,227 $ 1,095 $ 6,142