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9. COMMON STOCK (Details Narrative) - USD ($) $ in Thousands, shares in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 28, 2023
Class of Stock [Line Items] |  |  |  |  |
Cash received from stock sale |  | $ 13,999 | $ 129,026 | $ 24,368 |
Common Stock, Value, Outstanding |  |  |  |  | $ 43,500
June 2021 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock agreement terms and provisions |  | In June 2021, we entered into a $140.0 million ATM equity offering agreement with Craig-Hallum. Under the agreement we are able, at our discretion, to offer and sell shares of our common stock having an aggregate value of up to $140.0 million through Craig-Hallum. In 2021, we had issued 4.0 million shares of our common stock for net proceeds of $67.8 million under this ATM agreement. In 2022, we issued 4.3 million shares of our common stock for net proceeds of $14.0 million under this ATM agreement. In January 2023, we issued 5.0 million shares of our common stock for net proceeds of $12.5 million under the agreement. As of February 28, 2023, we have approximately $43.5 million available under this ATM agreement. |  |  |
Number of shares of common stock issued | 5.0 | 4.3 | 4.0 |  |
Cash received from stock sale | $ 12,500 | $ 14,000 | $ 67,800 |  |
February 2021 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock agreement terms and provisions |  | In February 2021, we entered into a $50.0 million ATM equity offering agreement with Craig-Hallum. Under the agreement we were able, at our discretion, to offer and sell shares of our common stock having an aggregate value of up to $50.0 million through Craig-Hallum. We issued 2.5 million shares of our common stock for net proceeds of $48.8 million under this ATM agreement. No further shares are available for sales under this agreement. |  |  |
Number of shares of common stock issued |  | 2.5 |  |  |
Cash received from stock sale |  | $ 48,800 |  |  |
December 2020 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock agreement terms and provisions |  | In December 2020, we entered into a $13.0 million ATM equity offering agreement with Craig-Hallum. Under the agreement we were able, from time to time, at our discretion to offer and sell shares of our common stock having an aggregate value of up to $13.0 million through Craig-Hallum. As of December 31, 2020, we had issued 1.0 million shares for net proceeds of $6.1 million that was received in January 2021. The $6.1 million was classified as subscriptions receivable on our December 31, 2020 balance sheet and is not included in the cash balance as of December 31, 2020. In January 2021, we issued 1.1 million shares of our common stock for net proceeds of $6.6 million under the agreement. In total, we issued 2.1 million shares of our common stock for net proceeds of $12.7 million under this ATM agreement. No further shares are available for sales under this agreement. |  |  |
Number of shares of common stock issued |  | 2.1 |  |  |
Cash received from stock sale |  | $ 12,700 |  |  |

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