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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
Total
Adjustment
Preferred stock
Common stock
Additional paid-in capital
Additional paid-in capital
Adjustment
Accumulated deficit
Accumulated deficit
Adjustment
Accumulated other comprehensive income (loss)
Beginning balance (in shares) at Dec. 31, 2020     9 186,851,493          
Beginning balance at Dec. 31, 2020 $ 461,140,758   $ 0 $ 186,851 $ 1,367,406,869   $ (906,196,812)   $ (256,150)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock for cash, net of financing costs (in shares)       20,355,000          
Issuance of common stock for cash, net of financing costs 162,105,030     $ 20,355 162,084,675        
Conversion of December 2019 Bonds to common stock (in shares)       1,009,450          
Conversion of December 2019 Bonds to common stock 4,377,892     $ 1,009 4,376,883        
Exercise of stock options for cash and vesting of RSUs, net of tax payments (in shares)       1,118,093          
Exercise of stock options for cash and vesting of RSUs, net of tax payments (1,201,789)     $ 1,118 (1,202,907)        
Stock-based compensation 9,595,947       9,595,947        
Net loss (54,402,131)           (54,402,131)    
Unrealized (loss) gain on short-term investments, net of tax 4,861               4,861
Foreign currency translation (14,419)               (14,419)
Ending balance at Mar. 31, 2021 581,606,149   $ 0 $ 209,333 1,542,261,467   (960,598,943)   (265,708)
Ending balance (in shares) at Mar. 31, 2021     9 209,334,036          
Beginning balance (in shares) at Dec. 31, 2020     9 186,851,493          
Beginning balance at Dec. 31, 2020 461,140,758   $ 0 $ 186,851 1,367,406,869   (906,196,812)   (256,150)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (136,542,089)                
Unrealized (loss) gain on short-term investments, net of tax 2,182                
Foreign currency translation (11,941)                
Ending balance at Jun. 30, 2021 508,553,771   $ 0 $ 210,146 1,551,348,435   (1,042,738,901)   (265,909)
Ending balance (in shares) at Jun. 30, 2021     9 210,146,880          
Beginning balance (in shares) at Mar. 31, 2021     9 209,334,036          
Beginning balance at Mar. 31, 2021 581,606,149   $ 0 $ 209,333 1,542,261,467   (960,598,943)   (265,708)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Exercise of stock options for cash and vesting of RSUs, net of tax payments (in shares)       812,844          
Exercise of stock options for cash and vesting of RSUs, net of tax payments 3,441,423     $ 813 3,440,610        
Stock-based compensation 5,646,358       5,646,358        
Net loss (82,139,958)           (82,139,958)    
Unrealized (loss) gain on short-term investments, net of tax (2,679)               (2,679)
Foreign currency translation 2,478               2,478
Ending balance at Jun. 30, 2021 508,553,771   $ 0 $ 210,146 1,551,348,435   (1,042,738,901)   (265,909)
Ending balance (in shares) at Jun. 30, 2021     9 210,146,880          
Beginning balance (in shares) at Dec. 31, 2021     9 217,382,887          
Beginning balance at Dec. 31, 2021 399,669,421 $ (1,468,216) $ 0 $ 217,382 1,609,589,797 $ (3,294,019) (1,209,855,522) $ 1,825,803 (282,236)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock for cash, net of financing costs (in shares)       8,480,483          
Issuance of common stock for cash, net of financing costs 29,364,538     $ 8,481 29,356,057        
Exercise of stock options for cash and vesting of RSUs, net of tax payments (in shares)       647,350          
Exercise of stock options for cash and vesting of RSUs, net of tax payments (942,521)     $ 646 (943,167)        
Stock-based compensation 7,711,151       7,711,151        
Net loss (79,073,719)           (79,073,719)    
Unrealized (loss) gain on short-term investments, net of tax (169,097)               (169,097)
Foreign currency translation (6,555)               (6,555)
Ending balance at Mar. 31, 2022 355,085,002   $ 0 $ 226,509 1,642,419,819   (1,287,103,438)   (457,888)
Ending balance (in shares) at Mar. 31, 2022     9 226,510,720          
Beginning balance (in shares) at Dec. 31, 2021     9 217,382,887          
Beginning balance at Dec. 31, 2021 399,669,421 $ (1,468,216) $ 0 $ 217,382 1,609,589,797 $ (3,294,019) (1,209,855,522) $ 1,825,803 (282,236)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (187,571,030)                
Unrealized (loss) gain on short-term investments, net of tax (346,088)                
Foreign currency translation (21,340)                
Ending balance at Jun. 30, 2022 297,671,112   $ 0 $ 247,503 1,693,674,022   (1,395,600,749)   (649,664)
Ending balance (in shares) at Jun. 30, 2022     9 247,504,547          
Beginning balance (in shares) at Mar. 31, 2022     9 226,510,720          
Beginning balance at Mar. 31, 2022 355,085,002   $ 0 $ 226,509 1,642,419,819   (1,287,103,438)   (457,888)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock for cash, net of financing costs (in shares)       20,470,475          
Issuance of common stock for cash, net of financing costs 43,156,834     $ 20,471 43,136,363        
Exercise of stock options for cash and vesting of RSUs, net of tax payments (in shares)       523,352          
Exercise of stock options for cash and vesting of RSUs, net of tax payments (217,690)     $ 523 (218,213)        
Stock-based compensation 8,336,053                
Net loss (108,497,311)           (108,497,311)    
Unrealized (loss) gain on short-term investments, net of tax (176,991)               (176,991)
Foreign currency translation (14,785)               (14,785)
Ending balance at Jun. 30, 2022 $ 297,671,112   $ 0 $ 247,503 $ 1,693,674,022   $ (1,395,600,749)   $ (649,664)
Ending balance (in shares) at Jun. 30, 2022     9 247,504,547