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Basis of Presentation and New Accounting Standards (Details)
$ / shares in Units, $ in Thousands
May 23, 2018
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
May 24, 2018
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Basis Of Presentation And New Accounting Standards [Line Items]            
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 6,176,054 6,200,000 5,782,573    
Common stock, shares outstanding (in shares) 61,600,000 6,176,054 6,200,000 5,782,573    
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          
Accounting Standards Update No. 2016-18 [Member]            
Basis Of Presentation And New Accounting Standards [Line Items]            
Restricted cash | $   $ 40   $ 700 $ 400 $ 400
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