Annual report pursuant to Section 13 and 15(d)

Consolidated Statement of Stockholders' Equity (Parenthetical)

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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Of Stockholders Equity [Abstract]    
Stock issuance cost $ 8,553 $ 7,047