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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 07, 2017
Mar. 01, 2017
Dec. 31, 2016
Jul. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Subsequent Event [Line Items]            
Common stock, shares authorized (in shares)     150,000,000 150,000,000 100,000,000 100,000,000
Preferred stock, shares authorized (in shares)     5,000,000     5,000,000
Common stock, par value (in dollars per share)     $ 0.001     $ 0.001
Preferred stock, par value (in dollars per share)     $ 0.001     $ 0.001
Preferred shares issued (in shares)     0     0
Warrants exercise price (usd per share)     $ 1.99     $ 7.14
Subsequent Event            
Subsequent Event [Line Items]            
Common stock, shares authorized (in shares)   150,000,000        
Preferred stock, shares authorized (in shares)   5,000,000        
Common stock, par value (in dollars per share)   $ 0.001        
Preferred stock, par value (in dollars per share)   $ 0.001        
Subsequent Event | 2017 Private Placement            
Subsequent Event [Line Items]            
Preferred stock, par value (in dollars per share) $ 1,000          
Preferred shares issued (in shares) 1          
Conversion price (usd per share) $ 0.7757          
Warrants exercise price (usd per share) $ 0.84591          
Period of time after issuance for warrants to become exercisable 6 months          
Expiration period from Initial Exercise Date 5 years          
Expected proceeds from offering $ 7,650          
Subsequent Event | 2017 Private Placement | Units            
Subsequent Event [Line Items]            
Number of units issued 8,000          
Purchase price per unit $ 1,000          
Subsequent Event | Minimum            
Subsequent Event [Line Items]            
Reverse stock split   0.3333        
Subsequent Event | Maximum            
Subsequent Event [Line Items]            
Reverse stock split   0.1000        
Scenario, Forecast | Minimum            
Subsequent Event [Line Items]            
Reverse stock split   0.3333        
Reduction in stated capital as a result of the reverse stock split   33.33%        
Scenario, Forecast | Maximum            
Subsequent Event [Line Items]            
Reverse stock split   0.1000        
Reduction in stated capital as a result of the reverse stock split   10.00%        
Common Stock | Subsequent Event | 2017 Private Placement            
Subsequent Event [Line Items]            
Number of shares per warrant (shares) 1,289