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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Other Comprehensive Income (Loss) [Member]
Class A Preferred Stock
Class B Preferred Stock
Class C Preferred Stock
Total
Balance at Dec. 31, 2019 $ 37,000 $ 285,609,000 $ (159,320,000) $ (45,000)       $ 126,281,000
Balance (in shares) at Dec. 31, 2019 37,339,787              
Net loss     (9,746,000)         (9,746,000)
Other comprehensive income (loss), net of taxes       305,000       305,000
Stock-based compensation expense   3,881,000           3,881,000
Issuance of common stock for board of director compensation $ 1,000 41,000           42,000
Issuance of common stock for board of director compensation (in shares) 1,968              
Proceeds from exercise of stock options and warrants $ 1,000 5,893,000           5,894,000
Proceeds from exercise of stock options and warrants (in shares) 1,223,438              
Balance at Jun. 30, 2020 $ 39,000 295,424,000 (169,066,000) 260,000 $ 0 $ 0 $ 0 126,657,000
Balance (in shares) at Jun. 30, 2020 38,565,193       0 0 0  
Balance at Mar. 31, 2020 $ 37,000 290,107,000 (163,263,000) 423,000 $ 0 $ 0 $ 0 127,304,000
Balance (in shares) at Mar. 31, 2020 37,930,255       0 0 0  
Net loss $ 0 0 (5,803,000) 0 $ 0 $ 0 $ 0 (5,803,000)
Other comprehensive income (loss), net of taxes 0 0 0 (163,000) 0 0 0 (163,000)
Stock-based compensation expense 0 2,281,000 0 0 0 0 0 2,281,000
Issuance of common stock for board of director compensation $ 1,000 21,000 0 0 0 0 $ 0 22,000
Issuance of common stock for board of director compensation (in shares) 699           0  
Proceeds from exercise of stock options and warrants $ 1,000 3,015,000 0 0 0 0 $ 0 3,016,000
Proceeds from exercise of stock options and warrants (in shares) 634,239           0  
Balance at Jun. 30, 2020 $ 39,000 295,424,000 (169,066,000) 260,000 $ 0 $ 0 $ 0 126,657,000
Balance (in shares) at Jun. 30, 2020 38,565,193       0 0 0  
Balance at Dec. 31, 2020 $ 40,000 566,451,000 (192,013,000) 5,376,000     $ 2,844,000 382,698,000
Balance (in shares) at Dec. 31, 2020 39,837,058           250,000  
Net loss     (8,916,000)         (8,916,000)
Other comprehensive income (loss), net of taxes       (4,276,000)       (4,276,000)
Stock-based compensation expense   7,003,000           7,003,000
Cost of Series C preferred stock conversion   (1,800,000)           (1,800,000)
Issuance of common stock in public offering, net of costs of $17.7 million $ 4,000 269,821,000           269,825,000
Issuance of common stock in public offering, net of costs of $17.7 million (in shares) 4,356,059              
Issuance of common stock for board of director compensation   11,000           11,000
Issuance of common stock for board of director compensation (in shares) 229              
Conversion of Series C preferred shares to common stock $ 1,000 764,000         $ (765,000)  
Conversion of Series C preferred shares to common stock (in shares) 1,312,860           (50,000)  
Paid-in-kind preferred stock dividend, including beneficial conversion feature   (4,196,000)         $ 4,196,000  
Proceeds from exercise of stock options and warrants $ 1,000 3,483,000           3,484,000
Proceeds from exercise of stock options and warrants (in shares) 386,242              
Balance at Jun. 30, 2021 $ 46,000 841,537,000 (200,929,000) 1,100,000 $ 0 $ 0 $ 6,275,000 648,029,000
Balance (in shares) at Jun. 30, 2021 45,892,448       0 0 200,000  
Balance at Mar. 31, 2021 $ 45,000 837,615,000 (195,540,000) 880,000 $ 0 $ 0 $ 4,275,000 647,275,000
Balance (in shares) at Mar. 31, 2021 45,693,692       0 0 200,000  
Net loss $ 0 0 (5,389,000) 0 $ 0 $ 0 $ 0 (5,389,000)
Other comprehensive income (loss), net of taxes 0 0 0 220,000 0 0 0 220,000
Stock-based compensation expense 0 4,025,000 0 0 0 0 0 4,025,000
Paid-in-kind preferred stock dividend, including beneficial conversion feature   (2,000,000)         2,000,000  
Proceeds from exercise of stock options and warrants $ 1,000 1,897,000 0 0 $ 0 $ 0 $ 0 1,898,000
Proceeds from exercise of stock options and warrants (in shares) 198,756       0 0 0  
Balance at Jun. 30, 2021 $ 46,000 $ 841,537,000 $ (200,929,000) $ 1,100,000 $ 0 $ 0 $ 6,275,000 $ 648,029,000
Balance (in shares) at Jun. 30, 2021 45,892,448       0 0 200,000