Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - 2019 Public Offering (Details)

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Stockholders' Equity - 2019 Public Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 14, 2019
Jan. 22, 2019
Dec. 31, 2019
Class of Stock [Line Items]      
Proceeds from common stock issued     $ 1
January 2019 Public Offering      
Class of Stock [Line Items]      
Proceeds from common stock issued   $ 9,100 9,063
May 2019 Public Offering      
Class of Stock [Line Items]      
Proceeds from common stock issued $ 20,300   20,317
Common Stock      
Class of Stock [Line Items]      
Proceeds from common stock issued     $ 1
Common Stock | January 2019 Public Offering      
Class of Stock [Line Items]      
Common stock issued (in shares)   5,175,000 5,175,000
Sale of stock (dollars per share)   $ 1.90  
Proceeds from initial public offering   $ 9,800  
Proceeds from common stock issued     $ 5
Common Stock | May 2019 Public Offering      
Class of Stock [Line Items]      
Common stock issued (in shares) 11,000,000   11,000,000
Sale of stock (dollars per share) $ 2.00    
Proceeds from initial public offering $ 22,000    
Proceeds from common stock issued     $ 11