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 ($)
1 Months Ended 12 Months Ended
Feb. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Statement Of Stockholders Equity [Abstract]      
Stock issuance costs $ 800,000 $ 93,000 $ 884,000