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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
Preferred Stock [Member]
Class A Preferred Stock
Preferred Stock [Member]
Class B Preferred Stock
Preferred Stock [Member]
Class C Preferred Stock
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Other Comprehensive Income (Loss) [Member]
Total
Balance at Dec. 31, 2019 $ 0 $ 0 $ 0 $ 37,000 $ 285,609,000 $ (159,320,000) $ (45,000) $ 126,281,000
Balance (in shares) at Dec. 31, 2019 0 0 0 37,339,787        
Net loss $ 0 $ 0 $ 0 $ 0 0 (21,164,000) 0 (21,164,000)
Other comprehensive income (loss), net of taxes 0 0 0 0 0 0 252,000 252,000
Stock-based compensation expense 0 0 0 0 6,293,000 0 0 6,293,000
Issuance of common stock for board of director compensation $ 0 $ 0 $ 0 $ 0 62,000 0 0 62,000
Issuance of common stock for board of director compensation (in shares) 0 0 0 2,400        
Proceeds from exercise of stock options and warrants $ 0 $ 0 $ 0 $ 2,000 8,310,000 0 0 8,312,000
Proceeds from exercise of stock options and warrants (in shares) 0 0 0 1,641,637        
Balance at Sep. 30, 2020 $ 0 $ 0 $ 0 $ 39,000 300,274,000 (180,484,000) 207,000 120,036,000
Balance (in shares) at Sep. 30, 2020 0 0 0 38,983,824        
Balance at Jun. 30, 2020 $ 0 $ 0 $ 0 $ 39,000 295,424,000 (169,066,000) 260,000 126,657,000
Balance (in shares) at Jun. 30, 2020 0 0 0 38,565,193        
Net loss $ 0 $ 0 $ 0 $ 0 0 (11,418,000) 0 (11,418,000)
Other comprehensive income (loss), net of taxes 0 0 0 0 0 0 (53,000) (53,000)
Stock-based compensation expense 0 0 0 0 2,412 0 0 2,412
Issuance of common stock for board of director compensation $ 0 $ 0 $ 0 $ 0 21,000 0 0 21,000
Issuance of common stock for board of director compensation (in shares) 0 0 0 432        
Proceeds from exercise of stock options and warrants $ 0 $ 0 $ 0 $ 0 2,417,000 0 0 2,417,000
Proceeds from exercise of stock options and warrants (in shares) 0 0 0 418,199        
Balance at Sep. 30, 2020 $ 0 $ 0 $ 0 $ 39,000 300,274,000 (180,484,000) 207,000 120,036,000
Balance (in shares) at Sep. 30, 2020 0 0 0 38,983,824        
Balance at Dec. 31, 2020 $ 0 $ 0 $ 2,844,000 $ 40,000 566,451,000 (192,013,000) 5,376,000 382,698,000
Balance (in shares) at Dec. 31, 2020 0 0 250,000 39,837,058        
Net loss           (15,442,000)   (15,442,000)
Other comprehensive income (loss), net of taxes $ 0 $ 0 $ 0 $ 0 0 0 (5,203,000) (5,203,000)
Stock-based compensation expense 0 0 0 0 11,152,000 0 0 11,152,000
Issuance of common stock for board of director compensation $ 0 $ 0 $ 0 $ 0 11,000 0 0 11,000
Issuance of common stock for board of director compensation (in shares) 0 0 0 229        
Cost of Series C preferred stock conversion $ 0 $ 0 $ 0 $ 0 (1,800,000) 0 0 (1,800,000)
Issuance of common stock in public offering, net of costs of $17.7 million $ 0 $ 0 $ 0 $ 4,000 269,821,000 0 0 269,825,000
Issuance of common stock in public offering, net of costs of $17.7 million (in shares) 0 0 0 4,356,059        
Conversion of Series C preferred shares to common stock $ 0 $ 0 $ (765,000) $ 1,000 764,000 0 0 0
Conversion of Series C preferred shares to common stock (in shares) 0 0 (50,000) 1,312,860        
Paid-in-kind preferred stock dividend, including beneficial conversion feature     $ 6,196,000   (6,196,000)      
Proceeds from exercise of stock options and warrants $ 0 $ 0 $ 0 $ 1,000 5,984,000 0 0 5,985,000
Proceeds from exercise of stock options and warrants (in shares) 0 0 0 701,360        
Balance at Sep. 30, 2021 $ 0 $ 0 $ 8,275,000 $ 46,000 846,187,000 (207,455,000) 173,000 647,226,000
Balance (in shares) at Sep. 30, 2021 0 0 200,000 46,207,566        
Balance at Jun. 30, 2021 $ 0 $ 0 $ 6,275,000 $ 46,000 841,537,000 (200,929,000) 1,100,000 648,029,000
Balance (in shares) at Jun. 30, 2021 0 0 200,000 45,892,448        
Net loss $ 0 $ 0 $ 0 $ 0 0 (6,526,000) 0 (6,526,000)
Other comprehensive income (loss), net of taxes 0 0 0 0 0 0 (927,000) (927,000)
Stock-based compensation expense 0 0 0 0 4,148,000 0 0 4,148,000
Paid-in-kind preferred stock dividend, including beneficial conversion feature     2,000,000   (2,000,000)      
Proceeds from exercise of stock options and warrants $ 0 $ 0 $ 0 $ 0 2,502,000 0 0 2,502,000
Proceeds from exercise of stock options and warrants (in shares) 0 0 0 315,118        
Balance at Sep. 30, 2021 $ 0 $ 0 $ 8,275,000 $ 46,000 $ 846,187,000 $ (207,455,000) $ 173,000 $ 647,226,000
Balance (in shares) at Sep. 30, 2021 0 0 200,000 46,207,566