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COMMON STOCK - Common Stock Issued, Net of Issuance Costs (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 04, 2020 | Apr. 14, 2017 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Common stock outstanding after the effect of reverse stock spilt conversion |  |  | 33,536,315 |  | 33,536,315 |  | 19,171,859
Common stock, par value |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001
Net proceeds from common stock |  |  |  |  | $ 77,863 | $ 6,291 |
Registered share available for future sales |  |  | 0 |  | 0 |  |
ATM Offering Agreement |  |  |  |  |  |  |
Number of common stock sold |  |  | 0 |  |  |  |
Registered share available for future sales |  |  | 0 |  | 0 |  |
Common Stock |  |  |  |  |  |  |
Number of common stock issued |  |  | 1,200,000 | 1,902,182 | 14,307,270 | 3,324,924 |
Cantor Fitzgerald & Co | ATM Offering Agreement |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  | 9,300,000 |  |
Net proceeds from common stock |  |  |  |  | $ 47,300 |  |
Cantor Fitzgerald & Co | Maximum | ATM Offering Agreement |  |  |  |  |  |  |
Sales commission percentage |  | 2.50% |  |  |  |  |
December 2020 PA |  |  |  |  |  |  |
Maximum aggregate offering price | $ 100,000 |  |  |  |  |  |
Period for financing from common stock | 36 months |  |  |  |  |  |
Threshold average sale price per share of common stock | $ 6.15 |  |  |  |  |  |
December 2020 PA | Lincoln Park |  |  |  |  |  |  |
Number of common stock issued |  |  | 1,200,000 |  | 5,000,000.0 |  |
Net proceeds from common stock |  |  | $ 5,700 |  | $ 30,600 |  |
Registered share available for future sales |  |  | 10,800,000 |  | 10,800,000 |  |
2019 Purchase Agreement with Lincoln Park | Maximum |  |  |  |  |  |  |
Percentage of common stock issuable | 19.99% |  |  |  |  |  |
2019 Purchase Agreement with Lincoln Park | Lincoln Park |  |  |  |  |  |  |
Minimum percentage considered for not to sale common stock | 9.99% |  |  |  |  |  |

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