Annual report pursuant to Section 13 and 15(d)

Statements of Stockholders??? Equity (Parenthetical)

v3.20.1
Statements of Stockholders’ Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Issued February 2018    
Stock issuance costs   $ 809
June 2018 Issuance    
Stock issuance costs   232
Lincoln Park Sale    
Stock issuance costs $ 59 $ 380
Issued March 2019    
Stock issuance costs 617  
April 2019 Stock Offerings    
Stock issuance costs $ 1,300