Quarterly report pursuant to Section 13 or 15(d)

Condensed Statements of Cash Flows (Parenthetical)

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Condensed Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Proceeds from issuance of common stock and warrants, offering cost $ 0 $ 5,671