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, 2017
Dec. 31, 2016
Shares issued, price per share (in dollars per share) $ 1.35 $ 3.00
Stock issuance costs   $ 1,150
Stock issuance costs, sale of units $ 550  
Stock warrants exercised, issuance costs 73  
Stock issuance costs, stock offering $ 166