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Warrants - (Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model) (Detail) - $ / shares
shares in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Warrant or Right [Line Items]        
Warrants outstanding 19,557 2,570 1,116 428
February 2017        
Class of Warrant or Right [Line Items]        
Warrants outstanding 17,000 0    
Strike price $ 1.10      
Expected term (years) 4 years 7 months 13 days      
Volatility % 136.07%      
Risk-free rate % 1.83%      
July 2016        
Class of Warrant or Right [Line Items]        
Warrants outstanding 700 700 0  
Strike price $ 13.00 $ 13.00    
Expected term (years) 4 years 15 days 4 years 6 months 15 days    
Volatility % 144.12% 117.82%    
Risk-free rate % 1.73% 1.82%    
January 2016        
Class of Warrant or Right [Line Items]        
Warrants outstanding 682 682 0  
Strike price $ 28.40 $ 28.40    
Expected term (years) 3 years 6 months 11 days 4 years 11 days    
Volatility % 150.15% 120.38%    
Risk-free rate % 1.64% 1.71%    
March 2015        
Class of Warrant or Right [Line Items]        
Warrants outstanding 700 700 700 0
Strike price $ 41.60 $ 41.60 $ 41.60  
Expected term (years) 2 years 8 months 19 days 3 years 2 months 19 days 4 years 2 months 19 days  
Volatility % 168.20% 131.46% 75.85%  
Risk-free rate % 1.50% 1.52% 1.58%  
September 2013        
Class of Warrant or Right [Line Items]        
Warrants outstanding 199 199 199 199
Strike price $ 50.00 $ 50.00 $ 50.00  
Expected term (years) 1 year 2 months 19 days 1 year 8 months 19 days 2 years 8 months 19 days  
Volatility % 100.31% 164.01% 74.70%  
Risk-free rate % 1.27% 1.10% 1.24%  
December 2012        
Class of Warrant or Right [Line Items]        
Warrants outstanding 152 152 152 152
Strike price $ 10.32 $ 31.60 $ 31.60  
Expected term (years) 5 months 23 days 11 months 23 days 1 year 11 months 23 days  
Volatility % 49.17% 204.55% 76.37%  
Risk-free rate % 1.13% 0.84% 1.05%  
April 2011        
Class of Warrant or Right [Line Items]        
Warrants outstanding 0 13 31 31
Strike price   $ 13.00 $ 13.00  
Expected term (years)   3 months 22 days 1 year 3 months 22 days  
Volatility %   103.79% 65.60%  
Risk-free rate %   0.53% 0.77%  
March 2011        
Class of Warrant or Right [Line Items]        
Warrants outstanding   0 9 9
Strike price     $ 13.00  
Expected term (years)     2 months 5 days  
Volatility %     47.98%  
March 2010        
Class of Warrant or Right [Line Items]        
Warrants outstanding   0 1 1
Strike price     $ 40.04  
Expected term (years)     2 months 27 days  
Volatility %     71.41%