Annual report pursuant to Section 13 and 15(d)

STATEMENTS OF CASH FLOWS [Parenthetical]

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STATEMENTS OF CASH FLOWS [Parenthetical] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Payments of Stock Issuance Costs $ 0 $ 0 $ 6,321