Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Shareholders' Equity (Parenthetical)

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Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Stockholders Equity [Abstract]        
Stock issuance costs $ 800 $ 902 $ 93 $ 884