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Stockholders' Equity - Common Stock and Warrants (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 13, 2020
USD ($)
Mar. 31, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Mar. 31, 2019
$ / shares
shares
Jun. 30, 2020
USD ($)
item
$ / shares
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2017
shares
Stockholders' equity                
Preferred stock, Shares authorized         5,000,000.0      
Preferred stock, par value | $ / shares         $ 0.01      
Net proceeds from shares of common stock sold | $   $ 23,500     $ (269) $ 28,265    
Common Stock Shares, Outstanding         306,959,462   303,378,515  
Common stock, par value (in dollars per share) | $ / shares         $ 0.01   $ 0.01  
Number of votes per share | item         1      
Common stock shares issued   10,000,000            
Par value, common stock | $ / shares         $ 0.01   0.01  
Share price (in dollars per share) | $ / shares   $ 2.35   $ 2.35        
Series A Junior Participating Cumulative Preferred Stock                
Stockholders' equity                
Preferred stock, par value | $ / shares         $ 0.01   $ 0.01  
Common Stock Shares, Outstanding         0   0  
At Market Issuance Sales Agreement                
Stockholders' equity                
Net proceeds from shares of common stock sold | $     $ 5,500          
Common stock shares issued     2,100,000 0        
Authorized amount | $ $ 75,000              
Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017                
Stockholders' equity                
Number of warrants exercised (in shares)         33,462,999   26,188,434  
Maximum | Warrant Issued With Amazon And Walmart Stores Inc Transaction Agreement In 2017                
Stockholders' equity                
Class of Warrant or Right Issued               110,573,392