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STOCKHOLDERS' EQUITY (Common Stock) (Details) |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Jul. 07, 2015 USD ($) $ / shares shares | Feb. 27, 2015 USD ($) $ / shares $ / unit shares | Oct. 22, 2014 USD ($) $ / shares shares | Mar. 13, 2013 shares | Jan. 24, 2013 USD ($) $ / shares shares | Feb. 02, 2012 USD ($) $ / shares shares | Dec. 29, 2010 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Jun. 30, 2015 $ / shares shares | Jan. 20, 2015 USD ($) | Jan. 15, 2015 USD ($) $ / shares shares | Oct. 21, 2014 $ / shares shares | Mar. 05, 2014 $ / shares shares | Jan. 31, 2013 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | [1] |  |  |  |  |  |  |  |  | 150,000,000 | 100,000,000 |  |  |  |  |  |
Proceeds from issuance of common stock and convertible notes | $ |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |
Common stock, shares issued | [1] |  |  |  |  |  |  |  |  | 13,915,691 | 8,084,471 |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  | 2,188,177 | 1,881,396 | 1,309,785 |  | 691,656 | 948,333 |  |  | 1,387,685 | 1,387,685 | 1,881,396 |  | 1,483,161 | 1,212,665 |  | 1,097,600
Common stock warrant, exercise price (in usd per share) | $ / shares |  | $ 6.50 | $ 7.56 | $ 10.86 |  |  | $ 15.00 |  |  | $ 10.25 | $ 10.25 | $ 7.56 |  | $ 9.59 | $ 11.73 |  | $ 12.96
Stock issuance costs | $ |  |  |  |  |  |  | $ 1,330,000 |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs, percentage of gross offering proceeds |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs, warrant right to purchase common stock shares |  |  |  |  |  |  | 31,666 |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs, warrant right to purchase common stock shares, percentage of shares in offering |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |
Stock issuance costs, reimbursable expenses | $ |  |  |  |  |  |  | $ 125,000 |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs, reduction to equity | $ |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |
Private placement, net, shares |  | 1,500,000 |  |  |  | 1,383,333 |  |  |  |  |  |  |  |  |  |  |
Share price (in usd per share) | $ / shares |  | $ 1.42 |  |  |  | $ 6.00 |  |  |  | $ 1.07 |  |  |  |  |  |  |
Private placement, net | $ |  |  |  |  |  | $ 8,300,000 |  |  |  | $ 8,970,000 | $ 2,361,000 |  |  |  |  |  |
Class of warrant or right, number of securities called by warrants or rights, price per share (in usd per share) | $ / shares |  |  |  |  |  | $ 9.00 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants | $ |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants term |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Third Security LLC And Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,212,665 | 1,097,600
Common stock warrant, exercise price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.73 | $ 12.96
Convertible notes, warrants callable (in shares) |  |  |  |  |  |  | 125,000 |  |  |  |  |  |  |  |  |  |
Affiliates of Third Security, LLC; January 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 9 |  |  |  |  |  |  |
Private placement, net, shares |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and convertible notes | $ |  |  |  |  |  |  | $ 22,000,000 |  | $ 3,000,000 |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  | 1,583,333 |  |  |  |  |  |  |  |  |  |
Common stock, sale price per share (in usd per share) | $ / shares |  |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  | 365,388 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ / shares |  |  |  | $ 4.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Private placement, net, shares |  |  |  | 730,776 |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in usd per share) | $ / shares |  |  |  | $ 3.25 |  |  |  |  |  |  |  |  |  |  |  |  |
Private placement, net | $ |  |  |  | $ 2,375,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants term |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Private Placement | Advisor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  | 9,230 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  |  |  | 823,333 |  |  |  |  |  |  |  |  |  |
Convertible Promissory Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ |  |  |  |  |  |  |  |  |  | $ 750,000 | $ 750,000 |  |  |  |  |  |
Convertible Promissory Note | Additional Note Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 925,000 |  |  |  |
Craig-Hallum Capital Group LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ / shares |  | $ 1.66 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs | $ |  | $ 212,783 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs, percentage of gross offering proceeds |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs, warrant right to purchase common stock shares |  | 107,033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs, reimbursable expenses | $ |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Craig-Hallum Capital Group LLC | Two Thousand Fifteen Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  | 714,780 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ / shares |  |  | $ 2.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private placement, net, shares |  |  | 3,573,899 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares that can be purchased for each warrant |  |  | 0.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price to the public (in usd per unit) | $ / unit |  |  | 1.95 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of stock and warrants (in usd per unit) | $ / unit |  |  | 1.8135 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the offering | $ |  |  | $ 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Craig-Hallum Capital Group LLC | Convertible Promissory Note | Additional Note Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,250 |  |  |
Percentage of proceeds from sale and issuance of the Additional Notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Series A Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants term |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Security LLC And Affiliates | Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, common stock callable (in shares) |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |
Series B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in usd per share) | $ / shares |  | $ 1.42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants term |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  | 700,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A and Series B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in usd per share) | $ / shares |  | $ 1.66 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A and Series B Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  | 1,200,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The common stock shares and additional paid-in capital for all periods presented reflect the one-for-twelve reverse stock split which took effect on January 27, 2014.

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