Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Cash Flows (unaudited) (Parenthetical)

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Condensed Consolidated Statements of Cash Flows (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Cash Flows [Abstract]    
Proceeds from public offering $ 1,400
Proceeds from issuance of shares   851
Proceeds from issuance of shares   $ 22