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STOCKHOLDERS' EQUITY - WARRANTS (Details) - USD ($) |  | 1 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016
Warrants Exercised In March 2015 |  |  |
Warrants |  |  |
Exercise Price (in dollars per share) | $ 3.75 |  |
Issuance of common stock upon exercise of warrants (in shares) | 235,000 |  |
Proceeds from Warrant Exercises | $ 881,000 |  |
CIRM | Warrants issued in August 2011 |  |  |
Warrants |  |  |
Exercise Price (in dollars per share) |  |  | $ 3.98
Number of shares into which warrant is converted upon exercise of warrant (in shares) |  |  | 537,893
CIRM | Warrants Exercised In December 2014 |  |  |
Warrants |  |  |
Number of shares into which warrant is converted upon exercise of warrant (in shares) |  | 461,382 |
Issuance of common stock upon net exercise of warrants (in shares) |  | 168,039 |

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