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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Oct. 14, 2019
Jun. 26, 2019
Mar. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock warrants exercised (in shares) 2,728,513      
Warrants liability     $ 3,074 $ 7,725
Series A Warrant        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Increase in number of shares issuable (in shares) 2,728,513      
Private Placement        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Sale of common stock (in shares)   2,728,513    
Sale price per share (in dollars per share)   $ 7.33    
Aggregate gross proceeds from sale   $ 20,000    
Minimum volume weighted average price (in dollars per share)   $ 3.96    
Ownership percentage threshold triggering warrants to be settled in cash   20.00%    
Maximum common stock ownership percentage   4.99%    
Maximum common stock ownership percentage if sixty days notice given   9.99%    
Lock-up period   105 days    
Private Placement | Series B-1 Warrant        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Anniversary of closing date (in months)   6 months    
Number of shares callable by warrants (in shares)   2,347,418    
Price of warrants (in dollars per share)   $ 8.52    
Private Placement | Series B-2 Warrant        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Anniversary of closing date (in months)   12 months    
Number of shares callable by warrants (in shares)   1,121,076    
Price of warrants (in dollars per share)   $ 8.92    
Percentage of VWAP determining forced exercise price   85.00%    
Private Placement | Series A Warrant        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares callable by warrants (in shares)   5,457,026    
Price of warrants (in dollars per share)   $ 12.00    
Exercisable period (in years)   5 years    
Private Placement | Series C Warrant        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period after first anniversary of closing date (in days)   90 days    
Discount of VWAP (as a percent)   7.50%    
Percentage of VWAP utilized at denominator of shares calculation   92.50%    
Percentage of the price per initial share   50.00%    
Private Placement | Series B-1 Or Series B-2 Warrant        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum common stock ownership percentage   4.99%