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Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Shares
Common Shares
Treasury Shares
Additional Paid-in Capital
Accumulated Deficit
Balance at Dec. 31, 2018 $ 152,330 $ 21,850 $ 246,663 $ (10,413) $ 1,282,762 $ (1,388,532)
Balance (in shares) at Dec. 31, 2018   289,317,460 329,110,863 (3,260,850)    
Exercise of stock options 15,456   $ 2,496   12,960  
Exercise of stock options (in shares)     3,838,739      
Vesting of restricted stock units (9,080)   $ 929 $ (9,080) (929)  
Vesting of restricted stock units (in shares)     1,416,124 (526,708)    
Stock-based compensation 6,596       6,596  
Net income (loss) (24,431)         (24,431)
Balance at Mar. 31, 2019 140,871 $ 21,850 $ 250,088 $ (19,493) 1,301,389 (1,412,963)
Balance (in shares) at Mar. 31, 2019   289,317,460 334,365,726 (3,787,558)    
Balance at Dec. 31, 2018 $ 152,330 $ 21,850 $ 246,663 $ (10,413) 1,282,762 (1,388,532)
Balance (in shares) at Dec. 31, 2018   289,317,460 329,110,863 (3,260,850)    
Exercise of stock options (in shares) 5,122,107          
Net income (loss) $ (29,713)          
Balance at Sep. 30, 2019 595,896 $ 21,850 $ 266,878 $ (20,533) 1,745,946 (1,418,245)
Balance (in shares) at Sep. 30, 2019   289,317,460 361,368,945 (3,841,615)    
Balance at Mar. 31, 2019 140,871 $ 21,850 $ 250,088 $ (19,493) 1,301,389 (1,412,963)
Balance (in shares) at Mar. 31, 2019   289,317,460 334,365,726 (3,787,558)    
Issuance of common stock under employee stock purchase plan 837   $ 30   807  
Issuance of common stock under employee stock purchase plan (in shares)     47,358      
Exercise of stock options 1,888   $ 396   1,492  
Exercise of stock options (in shares)     619,404      
Vesting of restricted stock units (1,040)   $ 74 $ (1,040) (74)  
Vesting of restricted stock units (in shares)     116,937 (54,057)    
Stock-based compensation 8,351       8,351  
Net income (loss) (1,820)         (1,820)
Balance at Jun. 30, 2019 149,087 $ 21,850 $ 250,588 $ (20,533) 1,311,965 (1,414,783)
Balance (in shares) at Jun. 30, 2019   289,317,460 335,149,425 (3,841,615)    
Issuance of common stock, net of transaction costs 440,108   $ 15,879   424,229  
Issuance of common stock, net of transaction costs (shares)     25,555,556      
Exercise of stock options 2,200   $ 411   1,789  
Exercise of stock options (in shares)     663,964      
Stock-based compensation 7,963       7,963  
Net income (loss) (3,462)         (3,462)
Balance at Sep. 30, 2019 595,896 $ 21,850 $ 266,878 $ (20,533) 1,745,946 (1,418,245)
Balance (in shares) at Sep. 30, 2019   289,317,460 361,368,945 (3,841,615)    
Balance at Dec. 31, 2019 608,263 $ 21,850 $ 269,173 $ (35,900) 1,764,317 (1,411,177)
Balance (in shares) at Dec. 31, 2019   289,317,460 365,014,893 (4,910,992)    
Exercise of stock options 1,306   $ 269   1,037  
Exercise of stock options (in shares)     412,465      
Vesting of restricted stock units (13,831)   $ 1,274 $ (13,831) (1,274)  
Vesting of restricted stock units (in shares)     1,951,448 (759,832)    
Stock-based compensation 10,591       10,591  
Net income (loss) (20,553)         (20,553)
Balance at Mar. 31, 2020 585,776 $ 21,850 $ 270,716 $ (49,731) 1,774,671 (1,431,730)
Balance (in shares) at Mar. 31, 2020   289,317,460 367,378,806 (5,670,824)    
Balance at Dec. 31, 2019 $ 608,263 $ 21,850 $ 269,173 $ (35,900) 1,764,317 (1,411,177)
Balance (in shares) at Dec. 31, 2019   289,317,460 365,014,893 (4,910,992)    
Exercise of stock options (in shares) 642,756          
Net income (loss) $ (22,926)          
Balance at Sep. 30, 2020 607,257 $ 5,434 $ 287,585 $ (50,728) 1,799,069 (1,434,103)
Balance (in shares) at Sep. 30, 2020   23,850,780 394,642,079 (5,813,385)    
Balance at Mar. 31, 2020 585,776 $ 21,850 $ 270,716 $ (49,731) 1,774,671 (1,431,730)
Balance (in shares) at Mar. 31, 2020   289,317,460 367,378,806 (5,670,824)    
Issuance of common stock under employee stock purchase plan 848   $ 76   772  
Issuance of common stock under employee stock purchase plan (in shares)     123,608      
Conversion of Series A Convertible Preferred Stock, net (238) $ (14,684) $ 14,684   (238)  
Conversion of Series A Convertible Preferred Stock, net (in shares)   (237,713,680) 23,771,368      
Exercise of stock options 352   $ 92   260  
Exercise of stock options (in shares)     148,290      
Vesting of restricted stock units (521)   $ 104 $ (521) (104)  
Vesting of restricted stock units (in shares)     167,240 (70,971)    
Stock-based compensation 12,131       12,131  
Net income (loss) 4,415         4,415
Balance at Jun. 30, 2020 602,763 $ 7,166 $ 285,672 $ (50,252) 1,787,492 (1,427,315)
Balance (in shares) at Jun. 30, 2020   51,603,780 391,589,312 (5,741,795)    
Conversion of Series A Convertible Preferred Stock, net (28) $ (1,732) $ 1,732   (28)  
Conversion of Series A Convertible Preferred Stock, net (in shares)   (27,753,000) 2,775,300      
Exercise of stock options 203   $ 53   150  
Exercise of stock options (in shares)     82,001      
Vesting of restricted stock units (476)   $ 128 $ (476) (128)  
Vesting of restricted stock units (in shares)     195,466 (71,590)    
Stock-based compensation 11,583       11,583  
Net income (loss) (6,788)         (6,788)
Balance at Sep. 30, 2020 $ 607,257 $ 5,434 $ 287,585 $ (50,728) $ 1,799,069 $ (1,434,103)
Balance (in shares) at Sep. 30, 2020   23,850,780 394,642,079 (5,813,385)