STOCKHOLDERS’ EQUITY (DEFICIT) (Details) - USD ($)
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3 Months Ended |
6 Months Ended |
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Apr. 29, 2019 |
Mar. 18, 2019 |
Jul. 13, 2018 |
Jun. 30, 2019 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Apr. 25, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Class of Stock [Line Items] |
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| Capital stock authorized (in shares) |
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360,000,000
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360,000,000
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| Common stock, par or stated value per share (in usd per share) |
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$ 0.0001
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$ 0.0001
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$ 0.0001
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$ 0.0001
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$ 0.001
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| Common stock, shares authorized (in shares) |
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350,000,000
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350,000,000
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350,000,000
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| Preferred stock, shares authorized (in shares) |
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10,000,000
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10,000,000
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10,000,000
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| Number of shares issued in transaction (in shares) |
4,318,272
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4,181,068
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8,499,340
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| Number of securities called by each warrant (in shares) |
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15,120,898
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15,120,898
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3,897,010
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| Write-off of deferred offering costs |
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$ 100,000
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$ 100,056
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$ 0
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| At-the-Market Offering |
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| Class of Stock [Line Items] |
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| Number of shares issued in transaction (in shares) |
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705,714
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705,714
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| Sale of stock, ATM maximum equity offering price |
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$ 40,000,000
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| Sale of stock, agent commissions fee |
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3.00%
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| Consideration received on transaction |
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$ 1,675,000
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