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Basis of Presentation and New Accounting Standards (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Aug. 05, 2019
$ / shares
shares
Apr. 25, 2019
USD ($)
Apr. 24, 2019
USD ($)
May 23, 2018
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Aug. 06, 2019
shares
Dec. 31, 2018
$ / shares
shares
May 24, 2018
shares
Basis Of Presentation And New Accounting Standards [Line Items]                  
Cash proceeds from sale of subsidiary | $         $ 2,789 $ 0      
Reverse stock split of common stock       0.1          
Common stock, par value (in dollars per share) | $ / shares       $ 0.001 $ 0.001     $ 0.001  
Common stock, shares authorized (in shares)       75,000,000 100,000,000     100,000,000 100,000,000
Common stock, shares issued (in shares)       61,600,000 443,117     443,117 6,200,000
Common stock, shares outstanding (in shares)       61,600,000 296,609     296,609 6,200,000
Number of shares callable by warrants (in shares)       23,400,000         2,300,000
Preferred stock, shares authorized (in shares)       5,000,000 5,000,000     5,000,000 5,000,000
Common stock, reverse stock split, fractional shares issued       0          
Operating lease right-of-use assets | $         $ 905        
Operating lease, liability | $         $ 905        
Subsequent Event [Member]                  
Basis Of Presentation And New Accounting Standards [Line Items]                  
Reverse stock split of common stock 0.02                
Common stock, par value (in dollars per share) | $ / shares $ 0.001                
Preferred stock, shares authorized (in shares) 5,000,000           5,000,000    
Common stock, reverse stock split, fractional shares issued 0                
Reverse stock split effective date for trading purposes Aug. 06, 2019                
Reverse stock split of common stock description Upon effectiveness, each 50 shares of issued and outstanding Common Stock were converted into one newly issued and outstanding share of Common Stock.                
2014 Equity Incentive Plan [Member]                  
Basis Of Presentation And New Accounting Standards [Line Items]                  
Number of shares callable by warrants (in shares)       9,100,000         900,000
Sale of UK Subsidiary and Certain Assets [Member] | Loan and Security Agreement [Member]                  
Basis Of Presentation And New Accounting Standards [Line Items]                  
Cash proceeds from sale of subsidiary | $     $ 4,000            
Payments for principal, interest and fees | $     $ 1,700            
Sale of the Japanese Subsidiary and Certain Assets [Member] | Loan and Security Agreement [Member]                  
Basis Of Presentation And New Accounting Standards [Line Items]                  
Cash proceeds from sale of subsidiary | $   $ 3,000              
Payments for principal, interest and fees | $   $ 1,400