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STOCKHOLDERS' EQUITY (Common Stock) (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2016 USD ($) shares | May 31, 2016 shares | Jan. 08, 2016 USD ($) $ / shares shares | Jan. 06, 2016 $ / shares shares | Dec. 29, 2010 USD ($) $ / shares | May 31, 2016 shares | Jan. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) $ / shares shares | Jun. 07, 2016 shares | Jul. 07, 2015 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  | 150,000,000 | 150,000,000 |  | 150,000,000 |  |
Initial valuation of warrant issued in conjunction with Private Placement | $ |  |  | $ 1,800,000 |  |  |  |  | $ 0 |  | $ 1,827,000 |  |  |
Debt settled with issuance of preferred stock and warrants | $ |  |  |  |  |  |  |  | $ 0 |  | 199,000 | $ 200,000 |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  | 214,705 | 214,705 |  | 214,705 |  |
Payments of stock issuance costs | $ |  |  |  |  |  |  |  |  |  | $ 219,000 |  |  |
Stock issued for services | $ | $ 89,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  | 26,863,062 | 26,446,927 |  | 26,446,927 |  |
Craig-Hallum Capital Group LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 4.39 |  |  |  |  |  |
Class of warrant or right, exercise term |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Payments of stock issuance costs | $ |  |  |  |  |  |  | $ 140,000 |  |  |  |  |  |
Payments of stock issuance costs, percentage of gross offering proceeds |  |  |  |  |  |  | 7.00% |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 50 |  |  |  |  |  |
Payments of stock Issuance costs, warrant right to purchase common stock (shares) |  |  |  |  |  |  | 107,527 |  |  |  |  |  |
Sale of stock, price per share | $ / shares |  |  |  |  |  |  | $ 1.21 |  |  |  |  |  |
Reimbursable expenses | $ |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |
Partners' capital account, units, sold in private placement (units) |  |  |  |  |  |  | 3,239,827 |  |  |  |  |  |
Craig-Hallum Capital Group LLC | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' capital account, units, sold in private placement (units) |  |  |  |  |  |  | 2,188,177 |  |  |  |  |  |
Vendor I |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for services (shares) |  | 78,000 |  |  |  |  |  |  |  |  |  |  |
Vendor II |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for services (shares) | 64,153 |  |  |  |  |  |  |  |  |  |  |  |
2016 Warrant |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 1.21 |  |  |  |  |
Number of shares converted, shares |  |  |  |  |  |  |  |  |  |  | 1,006,419 |  |
Class of warrant or right, exercise term |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Stock warrant exchange amount | $ |  |  |  |  |  |  |  | $ 1,436,882 |  |  |  |  |
Price per share of stock warrants exchanged (usd per unit) | $ / shares |  |  |  |  |  |  |  | $ 0.50 |  |  |  |  |
Series A-1 Warrant |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise period not subject to cash payment |  |  |  | 90 days |  |  |  |  |  |  |  |  |
At the Market Offering Agreement | Craig-Hallum Capital Group LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 4.23 |  | $ 4.23 |  |
Sale of stock, price per share | $ / shares |  |  |  |  |  |  |  |  | $ 0.42 |  | $ 0.42 |  |
Partners' capital account, units, sold in private placement (units) |  |  |  |  |  |  |  |  |  |  | 3,362,276 |  |
Placement fees, percentage of gross sales price |  |  |  |  |  |  |  |  |  |  |  | 3.25% |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 1,177,849 |  | 1,177,849 |  |
Proceeds from the issuance of stock | $ |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |
At the Market Offering Agreement | Craig-Hallum Capital Group LLC | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' capital account, units, sold in private placement (units) |  |  |  |  |  |  |  |  |  |  | 3,262,088 |  |
Series A-1 Convertible Preferred Stock and Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  | 1 |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  |  |  | $ 1.00 | $ 2.32 |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 0 |  |  |  |  |  |  |  |  |
Payments of stock issuance costs | $ |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |
Conversion ratio |  |  |  | 0.3333 |  |  |  |  |  |  |  |  |
Common Stock | Craig-Hallum Capital Group LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |
Common Stock | 2016 Warrant |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  |  |  |  | 2,873,765 |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.25 |  |  |  |  |
Number of shares converted, shares |  |  |  |  |  |  |  |  |  |  | 1,613,353 |  |
Cash payment for portion of stock warrants exercised | $ |  |  |  |  |  |  |  | $ 718,441 |  |  |  |  |
Stock warrants settled with cash | $ |  |  |  |  |  |  |  | $ 500,000 |  |  | $ 500,000 |  |
Security Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Private placement, net | $ |  |  | 2,200,000 |  |  |  |  |  |  |  |  |  |
Net proceeds from the issuance of stock warrants | $ |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
Security Purchase Agreement | Series A Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  |  |  |  | 1,161,972 |  |  |  |  | 1,161,972
Stock warrant exchange amount | $ |  |  |  |  |  |  |  | $ 941,197 |  |  |  |  |
Exercise period not subject to cash payment |  |  |  |  |  |  |  | 90 days |  |  |  |  |
Price per share of stock warrants exchanged (usd per unit) | $ / shares |  |  |  |  |  |  |  | $ 0.50 |  |  |  |  |
Security Purchase Agreement | Series A Warrants | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  |  |  |  |  | 1,882,395 |  |  |  |  |
Security Purchase Agreement | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Private placement, net (in shares) |  |  | 2,365,243 |  |  |  |  |  |  |  |  |  |
Dividends | $ |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called by each warrant or right (per right) |  |  | 1.075269 |  |  |  |  |  |  |  |  |  |
Number of shares converted, shares |  |  |  |  |  | 2,150,538 |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  | 214,705 |  |  |  |  |
Security Purchase Agreement | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | $ 0.93 |  |  |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called by each warrant or right (per right) |  |  | 0.93 |  |  |  |  |  |  |  |  |  |
Number of shares converted, shares |  |  |  |  |  | 2,150,538 |  |  |  |  |  |  |
Security Purchase Agreement | Common Stock | Series A Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrant, common stock called (in shares) |  |  |  | 1,882,395 |  |  |  |  |  |  |  |  |
Common stock warrant, exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.25 |  |  |  |  |
Cash payment for portion of stock warrants exercised | $ |  |  |  |  |  |  |  | $ 470,599 |  |  |  |  |

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