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Basis of Presentation and New Accounting Standards (Details)
$ / shares in Units, $ in Millions
May 23, 2018
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
May 24, 2018
shares
Dec. 31, 2017
$ / shares
shares
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   $ 0.001
Common stock, shares authorized (in shares) 75,000,000 100,000,000 100,000,000 100,000,000 100,000,000
Common stock, shares issued (in shares) 61,600,000 438,116 296,609 6,200,000 115,651
Common stock, shares outstanding (in shares) 61,600,000 438,116 296,609 6,200,000 115,651
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 5,000,000
Common stock, reverse stock split, fractional shares issued 0        
Operating lease, right-of-use asset | $   $ 2.2      
Operating lease, liability | $   $ 2.2      
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