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CONDENSED CONSOLIDATED STATEMENTS OF PREFERRED STOCK AND STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Total
At The Market
Public Offering
Common Stock
Common Stock
At The Market
Common Stock
Public Offering
Additional Paid-In Capital
Additional Paid-In Capital
At The Market
Additional Paid-In Capital
Public Offering
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance at Dec. 31, 2019 $ 73,121     $ 2     $ 235,049     $ 20 $ (161,950)
Beginning balance, shares at Dec. 31, 2019       21,833,037              
Issuance of common stock, net of issuance costs 69,842           69,842        
Issuance of common stock, net of issuance costs, shares       2,500,000              
Issuances from employee stock plans 30           30        
Issuances from employee stock plans, shares       970              
Stock-based compensation 2,088           2,088        
Foreign currency translation adjustment 204                 204  
Unrealized gain (loss) on marketable securities (217)                 (217)  
Net loss (13,139)                   (13,139)
Ending balance at Mar. 31, 2020 131,929     $ 2     307,009     7 (175,089)
Ending balance, shares at Mar. 31, 2020       24,334,007              
Beginning balance at Dec. 31, 2019 73,121     $ 2     235,049     20 (161,950)
Beginning balance, shares at Dec. 31, 2019       21,833,037              
Foreign currency translation adjustment (65)                    
Unrealized gain (loss) on marketable securities 119                    
Net loss (40,157)                    
Ending balance at Sep. 30, 2020 110,047     $ 2     312,078     74 (202,107)
Ending balance, shares at Sep. 30, 2020       24,495,525              
Beginning balance at Mar. 31, 2020 131,929     $ 2     307,009     7 (175,089)
Beginning balance, shares at Mar. 31, 2020       24,334,007              
Issuances from employee stock plans 864           864        
Issuances from employee stock plans, shares       108,835              
Stock-based compensation 2,035           2,035        
Foreign currency translation adjustment (199)                 (199)  
Unrealized gain (loss) on marketable securities 369                 369  
Net loss (12,387)                   (12,387)
Ending balance at Jun. 30, 2020 122,611     $ 2     309,908     177 (187,476)
Ending balance, shares at Jun. 30, 2020       24,442,842              
Issuance of common stock upon exercise of stock options, net of repurchase 165           165        
Issuance of common stock upon exercise of stock options, net of repurchase, shares       52,683              
Stock-based compensation 2,005           2,005        
Foreign currency translation adjustment (70)                 (70)  
Unrealized gain (loss) on marketable securities (33)                 (33)  
Net loss (14,631)                   (14,631)
Ending balance at Sep. 30, 2020 110,047     $ 2     312,078     74 (202,107)
Ending balance, shares at Sep. 30, 2020       24,495,525              
Beginning balance at Dec. 31, 2020 104,179     $ 2     319,196     (177) (214,842)
Beginning balance, shares at Dec. 31, 2020       24,773,361              
Issuance of common stock, net of issuance costs   $ 1,180           $ 1,180      
Issuance of common stock, net of issuance costs, shares         57,100            
Issuances from employee stock plans 121           121        
Issuances from employee stock plans, shares       31,620              
Stock-based compensation 2,687           2,687        
Foreign currency translation adjustment 38                 38  
Unrealized gain (loss) on marketable securities (50)                 (50)  
Net loss (16,514)                   (16,514)
Ending balance at Mar. 31, 2021 91,641     $ 2     323,184     (189) (231,356)
Ending balance, shares at Mar. 31, 2021       24,862,081              
Beginning balance at Dec. 31, 2020 104,179     $ 2     319,196     (177) (214,842)
Beginning balance, shares at Dec. 31, 2020       24,773,361              
Foreign currency translation adjustment 281                    
Unrealized gain (loss) on marketable securities (59)                    
Net loss (51,275)                    
Ending balance at Sep. 30, 2021 201,873     $ 3     467,942     45 (266,117)
Ending balance, shares at Sep. 30, 2021       29,513,754              
Beginning balance at Mar. 31, 2021 91,641     $ 2     323,184     (189) (231,356)
Beginning balance, shares at Mar. 31, 2021       24,862,081              
Issuance of common stock, net of issuance costs   $ 3,510 $ 134,582     $ 1   $ 3,510 $ 134,581    
Issuance of common stock, net of issuance costs, shares         157,871 4,356,060          
Issuances from employee stock plans 1,016           1,016        
Issuances from employee stock plans, shares       99,909              
Stock-based compensation 2,888           2,888        
Foreign currency translation adjustment 70                 70  
Unrealized gain (loss) on marketable securities (18)                 (18)  
Net loss (16,110)                   (16,110)
Ending balance at Jun. 30, 2021 217,579     $ 3     465,179     (137) (247,466)
Ending balance, shares at Jun. 30, 2021       29,475,921              
Issuances from employee stock plans 472           472        
Issuances from employee stock plans, shares       37,833              
Stock-based compensation 2,291           2,291        
Foreign currency translation adjustment 173                 173  
Unrealized gain (loss) on marketable securities 9                 9  
Net loss (18,651)                   (18,651)
Ending balance at Sep. 30, 2021 $ 201,873     $ 3     $ 467,942     $ 45 $ (266,117)
Ending balance, shares at Sep. 30, 2021       29,513,754