Annual report pursuant to Section 13 and 15(d)

Statements of Stockholders??? Equity (Parenthetical)

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Statements of Stockholders’ Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Stock warrants exercised, issuance costs   $ 73
Stock issuance costs, stock offering   $ 166
February 2018 Issuance | Common Stock    
Stock issuance costs $ 809  
June 2018 Issuance | Common Stock    
Stock issuance costs 232  
Q4 2018 Issuance | Common Stock    
Stock issuance costs $ 42