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STOCK AWARD PLAN AND STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Stock Award Plan and Stock-Based Compensation |  |  |  |  |
Fair value of common stock on grant date (in dollars per share) |  |  |  | $ 5.17 |
Total intrinsic value of the stock options exercised |  |  |  | $ 200,000 | $ 0
Dividend yield (as a percent) |  |  |  | 0.00% |
Stock-based compensation expense |  |  |  | $ 2,461,699 | $ 2,113,936
Employee Stock Option |  |  |  |  |
Stock Award Plan and Stock-Based Compensation |  |  |  |  |
Shares issued |  |  |  | 0 |
Fair value of common stock on grant date (in dollars per share) |  |  |  |  | $ 4.47
Total unrecognized compensation costs |  |  |  | $ 21,200,000 |
Weighted-average period over which unrecognized compensation costs is expected to be recognized |  |  |  | 3 years |
Dividend yield (as a percent) |  |  |  |  | 0.00%
RSUs |  |  |  |  |
Stock Award Plan and Stock-Based Compensation |  |  |  |  |
Total unrecognized compensation costs |  |  |  | $ 1,300,000 |
Weighted-average period over which unrecognized compensation costs is expected to be recognized |  |  |  | 1 year 9 months 18 days |
Vesting rights percentage |  |  |  | 25.00% |
Vesting period |  |  |  | 4 years |
Description of vesting rights |  |  |  | RSUs awarded to employees generally vest one-fourth per year over four years from the anniversary of the date of grant |
Non-Employees Stock Options |  |  |  |  |
Stock Award Plan and Stock-Based Compensation |  |  |  |  |
Shares issued |  |  |  | 0 | 40,000
Dividend yield (as a percent) |  |  |  |  | 0.00%
Stock-based compensation expense |  |  |  | $ 200,000 | $ 200,000
2013 Equity Incentive Plan |  |  |  |  |
Stock Award Plan and Stock-Based Compensation |  |  |  |  |
Increase in number of shares authorized for issuance | 750,000 |  |  |  |
Shares authorized for issuance under the plan | 6,531,333 |  |  |  |
Additional shares authorized for issuance under the plan as percentage of total shares outstanding | 4.00% |  |  |  |
2013 Equity Incentive Plan | Common Stock |  |  |  |  |
Stock Award Plan and Stock-Based Compensation |  |  |  |  |
Increase in number of shares authorized for issuance |  | 2,500,000 |  |  |
2013 Equity Incentive Plan | Employee Stock Option | Common Stock | Rick Russell |  |  |  |  |
Stock Award Plan and Stock-Based Compensation |  |  |  |  |
Shares issued |  |  | 775,000 |  |
Shares issued, price per share |  |  | $ 6.05 |  |
2013 Equity Incentive Plan | RSUs | Common Stock | Rick Russell |  |  |  |  |
Stock Award Plan and Stock-Based Compensation |  |  |  |  |
Shares issued |  |  | 40,000 |  |
Maximum | 2013 Equity Incentive Plan | Employee Stock Option |  |  |  |  |
Stock Award Plan and Stock-Based Compensation |  |  |  |  |
Term of share-based award | 10 years |  |  |  |

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