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RESTATEMENT OF PREVIOUSLY FILED FINANCIAL INFORMATION - STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 25, 2019 | Apr. 30, 2019 | Feb. 28, 2018 | Jul. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  | 103,113 | 153,113 | 133,308
Share Price |  |  |  |  | $ 11.80 | $ 10.58 | $ 13.18
Underwritten Public Offering |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 6,164,000 | 4,977,658 |  |  |
Share Price |  |  | $ 14.00 | $ 12.50 |  |  |
Proceeds From Issuance Of Common Stock Gross |  |  | $ 86,296,000 | $ 62,220,725 |  |  |
Proceeds from issuance of common stock, net of offering costs |  |  | 81,819,073 |  |  |  |
Payments of Stock Issuance Costs, |  |  | $ 4,476,927 |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 804,000 | 477,658 |  |  |
Wishbone Partners, LLC |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  | 4,581,001 |  |  |  |  |
Common Stock Held in Escrow |  | 2,538,071 |  |  |  |  |
Business Acquisition, Share Price | $ 6.19 |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | $ 28,331,327 |  |  |  |  |  |

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