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STOCKHOLDERS' EQUITY-Common stock and warrants (Details) | Oct. 08, 2019 series $ / shares shares | Mar. 31, 2021 $ / shares shares | Dec. 31, 2020 $ / shares shares
--- | --- | --- | ---
Stockholders' equity |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.0001 | $ 0.0001
Annualized Rate Of Increase To The Strike Price Of Warrants Issued | 6.75 |  |
Warrant term (in years) | 3 years |  |
Authorized shares of common stock, after amendment of certificate of incorporation |  | 100,000,000 | 100,000,000
Number of series of warrants | series | 3 |  |
Number of shares of common stock that can be purchased from warrants | 1 |  |
Series A Warrants |  |  |
Stockholders' equity |  |  |
Number of warrants issued |  | 1,800,000 |
Warrants issued | 1,798,322 |  |
Exercise price (in dollars per share) | $ / shares | $ 40.17 | $ 43.21 |
Series B Warrants |  |  |
Stockholders' equity |  |  |
Number of warrants issued |  | 2,200,000 |
Warrants issued | 2,247,985 |  |
Exercise price (in dollars per share) | $ / shares | $ 48.28 | $ 52.13 |
Series C Warrants |  |  |
Stockholders' equity |  |  |
Number of warrants issued |  | 2,900,000 |
Warrants issued | 2,890,271 |  |
Exercise price (in dollars per share) | $ / shares | $ 60.45 | $ 65.52 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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