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CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT - USD ($)
$ in Thousands
Series A convertible preferred stock
Series A-1 convertible preferred stock
Series A-2 convertible preferred stock
Series B convertible preferred stock
Series B-1 convertible preferred stock
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Total
Beginning Balances at Dec. 31, 2019           $ 1 $ 1 $ (58,239) $ (185) $ (58,422)
Beginning Balances (in shares) at Dec. 31, 2019           469,751        
Shareholders' Equity                    
Equity-based compensation             125     125
Accretion of convertible preferred stock to redemption value             (125) (928)   (1,053)
Other comprehensive loss                 (114) (114)
Net loss               (2,506)   (2,506)
Ending Balances at Mar. 31, 2020           $ 1 1 (61,673) (299) (61,970)
Ending Balances (in shares) at Mar. 31, 2020           469,751        
Beginning Balances at Dec. 31, 2019 $ 4,413 $ 5,160 $ 5,552 $ 37,802            
Beginning Balances (in shares) at Dec. 31, 2019 2,819,027 3,730,366 3,565,063 30,409,890            
Temporary equity                    
Accretion of convertible preferred stock to redemption value $ 88 $ 102 $ 111 $ 752            
Ending Balances at Mar. 31, 2020 $ 4,501 $ 5,262 $ 5,663 $ 38,554            
Ending Balances (in shares) at Mar. 31, 2020 2,819,027 3,730,366 3,565,063 30,409,890            
Beginning Balances at Dec. 31, 2019           $ 1 1 (58,239) (185) (58,422)
Beginning Balances (in shares) at Dec. 31, 2019           469,751        
Shareholders' Equity                    
Net loss                   (5,971)
Ending Balances at Sep. 30, 2020           $ 1 86 (66,351) (225) (66,489)
Ending Balances (in shares) at Sep. 30, 2020           537,371        
Beginning Balances at Dec. 31, 2019 $ 4,413 $ 5,160 $ 5,552 $ 37,802            
Beginning Balances (in shares) at Dec. 31, 2019 2,819,027 3,730,366 3,565,063 30,409,890            
Ending Balances at Sep. 30, 2020 $ 4,616 $ 5,398 $ 5,809 $ 39,547            
Ending Balances (in shares) at Sep. 30, 2020 2,819,027 3,730,366 3,565,063 30,409,890            
Beginning Balances at Mar. 31, 2020           $ 1 1 (61,673) (299) (61,970)
Beginning Balances (in shares) at Mar. 31, 2020           469,751        
Shareholders' Equity                    
Exercise of stock options             11     11
Exercise of stock options (in shares)           16,694        
Exercise of common stock warrants             34     34
Exercise of common stock warrants (in shares)           50,497        
Equity-based compensation             88     88
Accretion of convertible preferred stock to redemption value             (133) (920)   (1,053)
Other comprehensive loss                 56 56
Net loss               (1,674)   (1,674)
Ending Balances at Jun. 30, 2020           $ 1 1 (64,267) (243) (64,508)
Ending Balances (in shares) at Jun. 30, 2020           536,942        
Beginning Balances at Mar. 31, 2020 $ 4,501 $ 5,262 $ 5,663 $ 38,554            
Beginning Balances (in shares) at Mar. 31, 2020 2,819,027 3,730,366 3,565,063 30,409,890            
Temporary equity                    
Accretion of convertible preferred stock to redemption value $ 88 $ 102 $ 111 $ 752            
Ending Balances at Jun. 30, 2020 $ 4,589 $ 5,364 $ 5,774 $ 39,306            
Ending Balances (in shares) at Jun. 30, 2020 2,819,027 3,730,366 3,565,063 30,409,890            
Shareholders' Equity                    
Exercise of stock options (in shares)           429        
Equity-based compensation             129     129
Accretion of convertible preferred stock to redemption value             (44) (293)   (337)
Other comprehensive loss                 18 18
Net loss               (1,791)   (1,791)
Ending Balances at Sep. 30, 2020           $ 1 86 (66,351) (225) (66,489)
Ending Balances (in shares) at Sep. 30, 2020           537,371        
Temporary equity                    
Accretion of convertible preferred stock to redemption value $ 27 $ 34 $ 35 $ 241            
Ending Balances at Sep. 30, 2020 $ 4,616 $ 5,398 $ 5,809 $ 39,547            
Ending Balances (in shares) at Sep. 30, 2020 2,819,027 3,730,366 3,565,063 30,409,890            
Beginning Balances at Dec. 31, 2020           $ 1 222 (68,220) (187) (68,184)
Beginning Balances (in shares) at Dec. 31, 2020           538,793        
Shareholders' Equity                    
Exercise of stock options             14     14
Exercise of stock options (in shares)           20,787        
Equity-based compensation             98     98
Other comprehensive loss                 (5) (5)
Net loss               223   223
Ending Balances at Mar. 31, 2021           $ 1 334 (67,997) (192) (67,854)
Ending Balances (in shares) at Mar. 31, 2021           559,580        
Beginning Balances at Dec. 31, 2020 $ 4,616 $ 5,398 $ 5,809 $ 39,547           $ 55,370
Beginning Balances (in shares) at Dec. 31, 2020 2,819,027 3,730,366 3,565,063 30,409,890 0         40,524,346
Ending Balances at Mar. 31, 2021 $ 4,616 $ 5,398 $ 5,809 $ 39,547            
Ending Balances (in shares) at Mar. 31, 2021 2,819,027 3,730,366 3,565,063 30,409,890            
Beginning Balances at Dec. 31, 2020           $ 1 222 (68,220) (187) $ (68,184)
Beginning Balances (in shares) at Dec. 31, 2020           538,793        
Shareholders' Equity                    
Exercise of stock options (in shares)                   25,783
Net loss                   $ (4,377)
Ending Balances at Sep. 30, 2021           $ 1 142 (86,665) (196) (86,718)
Ending Balances (in shares) at Sep. 30, 2021           615,907        
Beginning Balances at Dec. 31, 2020 $ 4,616 $ 5,398 $ 5,809 $ 39,547           $ 55,370
Beginning Balances (in shares) at Dec. 31, 2020 2,819,027 3,730,366 3,565,063 30,409,890 0         40,524,346
Ending Balances at Sep. 30, 2021 $ 4,616 $ 5,398 $ 5,809 $ 39,547 $ 29,391         $ 84,761
Ending Balances (in shares) at Sep. 30, 2021 2,819,027 3,730,366 3,565,063 30,409,890 10,926,089         51,450,435
Beginning Balances at Mar. 31, 2021           $ 1 334 (67,997) (192) $ (67,854)
Beginning Balances (in shares) at Mar. 31, 2021           559,580        
Shareholders' Equity                    
Exercise of stock options             34     34
Exercise of stock options (in shares)           50,497        
Equity-based compensation             94     94
Issuance of Series B-1 Convertible Preferred Stock upon conversion of debt             (397) (14,068)   (14,465)
Other comprehensive loss                 (1) (1)
Net loss               (1,490)   (1,490)
Ending Balances at Jun. 30, 2021           $ 1 65 (83,555) (193) (83,682)
Ending Balances (in shares) at Jun. 30, 2021           610,077        
Beginning Balances at Mar. 31, 2021 $ 4,616 $ 5,398 $ 5,809 $ 39,547            
Beginning Balances (in shares) at Mar. 31, 2021 2,819,027 3,730,366 3,565,063 30,409,890            
Temporary equity                    
Issuance of Series B-1 Convertible Preferred Stock upon conversion of debt         $ 29,391          
Issuance of Series B-1 Convertible Preferred Stock upon conversion of debt (in shares)         10,926,089          
Ending Balances at Jun. 30, 2021 $ 4,616 $ 5,398 $ 5,809 $ 39,547 $ 29,391          
Ending Balances (in shares) at Jun. 30, 2021 2,819,027 3,730,366 3,565,063 30,409,890 10,926,089          
Shareholders' Equity                    
Exercise of stock options             5     $ 5
Exercise of stock options (in shares)           4,996       4,996
Exercise of common stock warrants (in shares)           834        
Equity-based compensation             72     $ 72
Other comprehensive loss                 (3) (3)
Net loss               (3,110)   (3,110)
Ending Balances at Sep. 30, 2021           $ 1 $ 142 $ (86,665) $ (196) (86,718)
Ending Balances (in shares) at Sep. 30, 2021           615,907        
Ending Balances at Sep. 30, 2021 $ 4,616 $ 5,398 $ 5,809 $ 39,547 $ 29,391         $ 84,761
Ending Balances (in shares) at Sep. 30, 2021 2,819,027 3,730,366 3,565,063 30,409,890 10,926,089         51,450,435