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STOCKHOLDERS' EQUITY - WARRANTS (Details) - USD ($) | Mar. 31, 2015 | Dec. 31, 2017
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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

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