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SHAREHOLDERS' EQUITY - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Apr. 16, 2021
STOCK BASED COMPENSATION |  |  |
Stock options granted (in shares) | 5,716,150 | 4,963,516 |
Number of common stock reserved for issuance | 30,000,000.0 |  | 12,500,000
Maximum number of shares that may be subject to grants of options to an individual in a calendar year | 500,000 |  |
Shares |  |  |
Granted (in shares) | 5,716,150 | 4,963,516 |
Shares of common stock issued upon exercise of stock options | 0 | 60,000 |
Weighted Average Exercise Price |  |  |
Weighted average exercise price of stock options (in dollars per share) |  | $ 1.06 |
Proceeds from exercise of stock options |  | $ 61 |
Granted (in shares) | 5,716,150 | 4,963,516 |
Common Stock and Additional Paid-in Capital |  |  |
Shares |  |  |
Shares of common stock issued upon exercise of stock options |  | 60,000 |

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