Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical)

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Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Offering cost May 2016 Private Placement     $ 345
Allocated transaction cost   $ 167 629
Offering cost November 2016 public offering     $ 1,688
Public offering December 2017 transaction cost $ 10 $ 1,256  
Payments of Stock Issuance Costs $ 2,096