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STOCKHOLDERS' EQUITY (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Preferred stock, shares authorized | 10,000,000 | 10,000,000 | 10,000,000
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001
Net Proceeds From Shares New Issues Over-Allotments | $ 113,639 | $ 131,516 | $ 4,411
Common Stock, Shares Authorized | 150,000,000 | 150,000,000 | 150,000,000
Share-based Compensation, Total | $ 12,900 | $ 15,900 | $ 7,500
Treasury Stock, Shares | 41,309 | 41,309 | 41,309
Treasury Stock, Value | $ 234 | $ 234 | $ 234
Atm [Member] |  |  |
Stock Issued During Period, Shares, New Issues | 9,025,222 | 3,104,253 | 570,366
Share Price | $ 12.83 | $ 10.18 | $ 7.88
Gross proceeds |  | $ 31,600 | $ 4,400
Net proceeds |  | $ 31,000 | $ 4,500

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