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Statements of Shareholders' Equity (Deficit) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Receivables from Stockholder [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Beginning balance, value at Dec. 31, 2019 $ (3,977) $ 126 $ 568,496 $ 0 $ 0 $ (572,599)
Beginning balance, share at Dec. 31, 2019   125,803        
Share-based compensation expense 1,252 $ 0 1,252 0 0 0
Share-based compensation expense, share   201        
Sales of common stock, net of issuance costs 24,368 $ 26 30,477 (6,135) 0 0
Sales of common stock, net of issuance costs, share   26,229        
Net loss (13,634) $ 0 0 0 0 (13,634)
Exercise of options 1,000 $ 1 999 0 0 0
Exercise of options, share   693        
Ending balance, share at Dec. 31, 2020   152,926        
Ending balance, value at Dec. 31, 2020 9,009 $ 153 601,224 (6,135) 0 (586,233)
Share-based compensation expense 15,284 $ 2 15,282 0 0 0
Share-based compensation expense, share   2,365        
Sales of common stock, net of issuance costs 129,026 $ 7 122,884 6,135 0 0
Sales of common stock, net of issuance costs, share   7,554        
Net loss (43,200) $ 0 0 0 0 (43,200)
Exercise of options 2,654 $ 2 2,652 0 0 0
Exercise of options, share   1,518        
Other comprehensive loss $ (19) $ 0 0 0 (19) 0
Ending balance, share at Dec. 31, 2021 164,363 164,363        
Ending balance, value at Dec. 31, 2021 $ 112,754 $ 164 742,042 0 (19) (629,433)
Share-based compensation expense 15,461 $ 1 15,460 0 0 0
Share-based compensation expense, share   1,294        
Sales of common stock, net of issuance costs 13,999 $ 5 13,994   0 0
Sales of common stock, net of issuance costs, share   4,321        
Net loss (53,091) $ 0 0 0 0 (53,091)
Exercise of options 726 $ 1 725 0 0 0
Exercise of options, share   525        
Other comprehensive loss $ (108) $ 0 0 0 (108) 0
Ending balance, share at Dec. 31, 2022 164,363 170,503        
Ending balance, value at Dec. 31, 2022 $ 89,741 $ 171 $ 772,221 $ 0 $ (127) $ (682,524)