Quarterly report pursuant to Section 13 or 15(d)

10. COMMON STOCK (Details Narrative)

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10. COMMON STOCK (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Class of Stock [Line Items]    
Cash received from stock sale   $ 61,464
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. As of March 31, 2022, we had issued 4.0 million shares of our common stock for net proceeds of $67.8 million under this ATM agreement. There have been no transactions under this agreement since June 2021.  
Number of shares of common stock issued 4.0  
Cash received from stock sale $ 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 was 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 have 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