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STOCKHOLDER'S EQUITY - Common Stock Issued, Net of Issuance Costs (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 04, 2020 | Oct. 02, 2020 | Jun. 26, 2020 | May 21, 2020 | Apr. 14, 2017 | Oct. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Net proceeds from common stock |  |  |  |  |  |  |  |  | $ 84,142 | $ 63,614
ATM Offering Agreement |  |  |  |  |  |  |  |  |  |
Amount available for future sales |  |  |  |  |  |  |  |  | $ 47,700 |
Common Stock |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  |  |  | 16,050,518 | 15,681,968
Cantor Fitzgerald & Co | ATM Offering Agreement |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  |  |  | 10,000,000.0 |
Net proceeds from common stock |  |  |  |  |  |  |  |  | $ 49,500 |
2020 Lincoln Park PA |  |  |  |  |  |  |  |  |  |
Maximum aggregate offering price | $ 100,000 |  |  |  |  |  |  |  |  |
Period for financing from common stock | 36 months |  |  |  |  |  |  |  |  |
Percentage of common stock issuable | 19.99% |  |  |  |  |  |  |  |  |
Threshold average sale price per share of common stock | $ 6.15 |  |  |  |  |  |  |  |  |
2020 Lincoln Park PA | Lincoln Park |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  |  |  | 6,100,000 |
Net proceeds from common stock |  |  |  |  |  |  |  |  | $ 34,600 |
Amount available for future sales |  |  |  |  |  |  |  |  | $ 47,700 |
May 2020 Purchase Agreement with Lincoln Park |  |  |  |  |  |  |  |  |  |
Maximum aggregate offering price |  | $ 3,200 |  | $ 12,000 |  | $ 12,000 |  |  |  |
Period for financing from common stock |  |  |  | 24 months |  |  |  |  |  |
Number of common stock issued |  | 1,100,000 | 1,970,000 | 156,250 |  |  | 1,600,000 | 1,800,000 |  |
Net proceeds from common stock |  | $ 8,200 |  |  |  |  | $ 3,500 | $ 3,800 |  |
Number of warrants issued for common stock |  |  |  | 250,000 |  |  |  |  |  |
Warrant purchase price per share |  |  |  | $ 1.2989 |  |  |  |  |  |
2019 Purchase Agreement with Lincoln Park | Lincoln Park |  |  |  |  |  |  |  |  |  |
Minimum percentage considered for not to sale common stock | 9.99% |  |  |  |  |  |  |  |  |
ATM Offering Agreement | Cantor Fitzgerald & Co |  |  |  |  |  |  |  |  |  |
Net proceeds from common stock |  |  |  |  |  |  |  |  |  | $ 49,900
Number of common stock sold |  |  |  |  |  |  |  |  |  | 11,000,000.0
ATM Offering Agreement | Cantor Fitzgerald & Co | Maximum |  |  |  |  |  |  |  |  |  |
Sales commission percentage |  |  |  |  | 2.50% |  |  |  |  |

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