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STOCKHOLDERS' EQUITY (Details Textual) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2016 | Oct. 19, 2017 | Nov. 23, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock Issued During Period, Shares, New Issues |  |  | 5,750,000 |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | $ 92,000,000 |  |  |  |
Shares Issued, Price Per Share |  | $ 7.00 | $ 16.00 | $ 7.00 |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  | 1,820,686 |  |
July Financing Agent Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | [1] |  |  |  | $ 6.05 |  |
Class of Warrant or Right, Outstanding | [1] |  |  |  | 20,000 |  |
Class Of Warrants Or Right Expiration Date | [1] |  |  |  | Jul. 31, 2020 |  |
May Financing Agent Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | [2] |  |  |  | $ 11.00 |  |
Class of Warrant or Right, Outstanding | [2] |  |  |  | 50,000 |  |
Class Of Warrants Or Right Expiration Date | [2] |  |  |  | May 11, 2020 |  |
December Financing [Member] |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 0.01 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | [3] |  |  |  | $ 5.00 |  |
Class of Warrant or Right, Outstanding | [3] |  |  |  | 1,749,186 |  |
Class Of Warrants Or Right Expiration Date | [3] |  |  |  | Dec. 24, 2019 |  |
December Financing Agent Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | [3] |  |  |  | $ 5.00 |  |
Class of Warrant or Right, Outstanding | [3] |  |  |  | 1,500 |  |
Class Of Warrants Or Right Expiration Date | [3] |  |  |  | Dec. 18, 2019 |  |
Series B Private Placements [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 25.00 |  |
Class of Warrant or Right, Outstanding |  |  |  |  | 400,001 |  |
Class Of Warrants Or Right Expiration Date |  |  |  |  | Oct. 24, 2018 |  |
Dollar Five Warrant [Member] |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 3,233,000 | $ 885,000 | $ 0
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 5.00 | $ 5.00 | $ 5.00
Class of Warrant or Right, Outstanding |  |  |  |  | 1,820,686 | 2,934,685 |
Common Stock [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 6,000,000 |  | 293,889 |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  | $ 44,057,000 |  |  |
[1] | In connection with the offering on July 31, 2015, the placement agent received warrants to purchase 20,000 shares of common stock at $6.05 per share. The warrants are exercisable and expire on July 31, 2020.
[2] | In connection with the offering on May 11, 2015, the placement agent received warrants to purchase 50,000 shares of common stock at $11.00 per share. The warrants are exercisable and expire on May 11, 2020.
[3] | In connection with an offering on December 24, 2014, warrants to purchase 3,500,000 shares of common stock at $5.00 per share were purchased and issued for $0.01 per warrant. The warrants are exercisable and expire on December 24, 2019. Also, in connection with the offering on December 24, 2014, the underwriter received warrants to purchase 68,735 shares of common stock at $5.00 per share. The warrants are exercisable and expire on December 18, 2019.

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