Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
Total
IPO
Common Stock
Common Stock
IPO
Additional Paid-in Capital
Additional Paid-in Capital
IPO
Accumulated Deficit
Balance, beginning of period at Dec. 31, 2018 $ 5,129,000   $ 15,000   $ 148,641,000   $ (143,527,000)
Balance, shares at Dec. 31, 2018     15,591,357        
Beginning balance adjustment – impact of ASC 606 3,115,000           3,115,000
Issuance of common stock, net of issuance costs 1,604,000 $ 36,850,000 $ 1,000 $ 4,000 1,603,000 $ 36,846,000  
Issuance of common stock, net of issuance costs, shares     227,628 4,297,901      
Issuance of common stock upon purchase of ESPP 146,000       146,000    
Issuance of common stock upon purchase of ESPP, shares     68,606        
Issuance of common stock upon exercise of stock options $ 81,000       81,000    
Issuance of common stock upon exercise of stock options, shares 95,739   95,739        
Exercise of warrants $ 23,000       23,000    
Exercise of warrants, shares     155,338        
Taxes paid on RSA (1,897,000)       (1,897,000)    
Employee and nonemployee stock-based compensation 6,308,000       6,308,000    
Net loss (25,834,000)           (25,834,000)
Balance, at end of period at Dec. 31, 2019 25,525,000   $ 20,000   191,751,000   (166,246,000)
Balance, shares at Dec. 31, 2019     20,437,235        
Issuance of common stock, net of issuance costs 25,086   $ 37,000   25,049,000    
Issuance of common stock, net of issuance costs, shares     36,800,000        
Issuance of common stock, settlement of long-term debt 6,170,000   $ 8,000   6,162,000    
Issuance of common stock, settlement of long-term debt, shares     8,226,834        
Issuance of common stock upon purchase of ESPP 98,000       98,000    
Issuance of common stock upon purchase of ESPP, shares     192,335        
Issuance of common stock upon exercise of stock options $ 382,000   $ 1,000   381,000    
Issuance of common stock upon exercise of stock options, shares 541,268   541,268        
Net settlement of common stock upon release of RSU $ (6,000)       (6,000)    
Net settlement of common stock upon release of RSU, shares     113,195        
Employee and nonemployee stock-based compensation 1,087,000       1,087,000    
Net loss (29,932,000)           (29,932,000)
Balance, at end of period at Dec. 31, 2020 $ 28,410,000   $ 66,000   $ 224,522,000   $ (196,178,000)
Balance, shares at Dec. 31, 2020     66,310,867