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STOCKHOLDERS' EQUITY (Common Stock) (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  |
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Jan. 06, 2016 USD ($) $ / shares shares | Jul. 07, 2015 USD ($) $ / shares shares | Feb. 27, 2015 USD ($) $ / shares $ / unit shares | Oct. 22, 2014 USD ($) $ / shares shares | Jan. 24, 2013 USD ($) $ / shares shares | Feb. 02, 2012 USD ($) $ / shares shares | Dec. 31, 2011 USD ($) | Mar. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 $ / shares shares | Jan. 20, 2015 USD ($) | Jan. 15, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Oct. 21, 2014 $ / shares shares | Mar. 05, 2014 $ / shares shares | Dec. 31, 2012 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  | 150,000,000 | 150,000,000 |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  | 20,695,870 | 13,915,691 |  |  |  |  |  |
Private placement, net (in shares) | 6,780,179 | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 1.42 |  |  |  |  |  | $ 0.58 |  |  |  |  |  |  |
Private placement, net | $ |  |  |  |  |  |  |  | $ 543,000 |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants | $ |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  | 2,365,243 | 4,029,502 |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |
Craig-Hallum Capital Group LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants term | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares | $ 1.21 | $ 1.66 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs | $ | $ 140,000 | $ 212,783 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs, percentage of gross offering proceeds | 7.00% | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs, warrant right to purchase common stock shares | 107,527 | 107,033 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs, reimbursable expenses (not to exceed) | $ | $ 50,000 | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of warrants | $ | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 750,000 |  |  |
Third Security LLC and affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  | 1,097,600 |  |  |  |  |  |  |  |  | 1,212,665 |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 12.96 |  |  |  |  |  |  |  |  | $ 11.73 |
Series A Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants term |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, period exercisable |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exchange amount | $ | $ 941,197 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise period not subject to cash payment | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exchange price threshold | $ / shares | $ 0.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) | 1,161,972 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Warrant, Cashless Exchange | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) | 1,882,395 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A-1 Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) | 1,773,929 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares | $ 1.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, period exercisable | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exchange amount | $ | $ 1,436,882 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise period not subject to cash payment | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exchange price threshold | $ / shares | $ 0.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A-1 Warrant | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) | 2,873,765 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants term |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 1.42 |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  | 700,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  | $ 1.66 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  | 1,200,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
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 (in shares) |  |  |  |  |  | 1,583,333 |  |  |  |  |  |  |  |  |
Common stock, sale price per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |  |
Warrants term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) | 3,239,827 | 2,188,177 | 1,881,396 | 1,309,785 | 1,097,600 | 823,333 |  |  |  |  | 1,483,161 | 1,387,685 | 1,212,665 |  | 948,333
Common stock warrant, exercise price (in dollars per share) | $ / shares | $ 4.39 | $ 6.50 | $ 7.56 | $ 10.86 | $ 12.96 | $ 15.00 |  |  |  |  | $ 9.59 | $ 10.25 | $ 11.73 |  | $ 15.00
Payments of 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 (not to exceed) | $ |  |  |  |  |  | $ 125,000 |  |  |  |  |  |  |  |  |
Payments of stock issuance costs, reduction to equity | $ |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |
Private Placement | Third Security LLC and affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, common stock callable (in shares) |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |
Convertible notes, warrants callable (in shares) |  |  |  |  |  | 125,000 |  |  |  |  |  |  |  |  |
Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  | 691,655 |  |  |  |  |  |  |  |  |  |
Private placement, net (in shares) |  |  |  |  | 1,383,333 |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  | $ 6.00 |  |  |  |  |  |  |  |  |  |
Private placement, net | $ |  |  |  |  | $ 8,300,000 |  |  |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called by warrants or rights, price per share (in dollars per share) | $ / shares |  |  |  |  | $ 9.00 |  |  |  |  |  |  |  |  |  |
Offering | Affiliates of Third Security, LLC; January 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |
Private placement, net (in shares) |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |
2014 Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  | 365,388 |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  |  |  | $ 4.00 |  |  |  |  |  |  |  |  |  |  |
Private placement, net (in shares) |  |  |  | 730,776 |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 3.25 |  |  |  |  |  |  |  |  |  |  |
Private placement, net | $ |  |  |  | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |
2014 Private Placement | Advisor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  | 9,230 |  |  |  |  |  |  |  |  |  |  |
Additional Note Private Placement | Convertible notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount | $ |  |  |  |  |  |  |  |  |  | $ 925,000 |  |  |  |  |
Additional Note Private Placement | Convertible notes payable | Craig-Hallum Capital Group LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount | $ |  |  |  |  |  |  |  |  |  |  | $ 46,250 |  |  |  |
Face amount as percentage of proceeds from debt issuance |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
2015 Offering | Craig-Hallum Capital Group LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  | 714,780 |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  |  | $ 2.24 |  |  |  |  |  |  |  |  |  |  |  |
Private placement, net (in shares) |  |  | 3,573,899 |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called by each warrant or right (in shares) |  |  | 0.20 |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, purchase price per share, public (in dollars per share) | $ / unit |  |  | 1.95 |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, purchase price per share, underwriter (in dollars per share) | $ / unit |  |  | 1.8135 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants, net | $ |  |  | $ 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, expiration period |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Series A-1 Convertible Preferred Stock and Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock | $ | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share of shares issued (in dollars per share) | $ / shares | $ 0.93 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A-1 Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | 2,365,243 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting rights, number of shares per one vote | 1.075269 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend conversion rate per share | $ / shares | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma | Series A Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Warrants | $ | $ 470,599 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exchange amount | $ | $ 941,197 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma | Series A Warrant, Cashless Exchange | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) | 1,882,395 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma | Series A-1 Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Warrants | $ | $ 718,441 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exchange amount | $ | $ 1,436,882 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma | Series A-1 Warrant | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) | 2,873,765 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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