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STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands | 10 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Proceeds from issuance of common stock and warrants, offering cost | $ 0 | $ 5,674 | $ 4,090
NSC Note [Member] |  |  |
Debt Instrument, Unamortized Discount | $ 0 | $ 0 | $ 129

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