Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit)

v3.21.2
Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Other Comprehensive Loss
Beginning balance at Dec. 31, 2019 $ 4,026 $ 4 $ 128,008 $ (123,604) $ (382)
Beginning balance (in shares) at Dec. 31, 2019   39,811      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options, net of vesting of restricted shares 87   87    
Exercise of stock options, net of vesting of restricted shares (in shares)   153      
Release of restricted stock (in shares)   694      
Issuance of common stock for payment of board of director fees 1,014   1,014    
Issuance of common stock for payment of legal and board of director fees (in shares)   1,133      
Stock-based compensation expense 1,750   1,750    
Issuance of common stock upon partial conversions of Senior Convertible Note 2,266   2,266    
Issuance of common stock upon partial conversions of Senior Convertible Note (in shares)   1,764      
Reacquisition of equity component of Senior Convertible Note (1,299)   (1,299)    
Equity classified cash conversion feature of Senior Convertible Notes 219   219    
Cumulative translation adjustment (75)       (75)
Net loss (7,474)     (7,474)  
Ending balance at Jun. 30, 2020 514 $ 4 132,045 (131,078) (457)
Ending balance (in shares) at Jun. 30, 2020   43,555      
Beginning balance at Mar. 31, 2020 1,353 $ 4 129,370 (127,567) (454)
Beginning balance (in shares) at Mar. 31, 2020   40,693      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options, net of vesting of restricted shares 70   70    
Exercise of stock options, net of vesting of restricted shares (in shares)   120      
Release of restricted stock (in shares)   578      
Issuance of common stock for payment of board of director fees 523   523    
Issuance of common stock for payment of legal and board of director fees (in shares)   400      
Stock-based compensation expense 1,115   1,115    
Issuance of common stock upon partial conversions of Senior Convertible Note 2,266   2,266    
Issuance of common stock upon partial conversions of Senior Convertible Note (in shares)   1,764      
Reacquisition of equity component of Senior Convertible Note (1,299)   (1,299)    
Cumulative translation adjustment (3)       (3)
Net loss (3,511)     (3,511)  
Ending balance at Jun. 30, 2020 514 $ 4 132,045 (131,078) (457)
Ending balance (in shares) at Jun. 30, 2020   43,555      
Beginning balance at Dec. 31, 2020 (1,979) $ 6 144,156 (145,803) (338)
Beginning balance (in shares) at Dec. 31, 2020   56,371      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options, net of vesting of restricted shares 70   70    
Exercise of stock options, net of vesting of restricted shares (in shares)   131      
Release of restricted stock (in shares)   1,012      
Issuance of common stock for payment of board of director fees 66   66    
Issuance of common stock for payment of legal and board of director fees (in shares)   99      
Sales of common stock, net of issuance costs 30,537 $ 1 30,536    
Sales of common stock, net of issuance costs (in shares)   15,123      
Stock-based compensation expense 2,426   2,426    
Reacquisition of equity component of Senior Convertible Note 0        
Equity classified cash conversion feature of Senior Convertible Notes 0        
Cumulative translation adjustment 15       15
Net loss (20,656)     (20,656)  
Ending balance at Jun. 30, 2021 10,479 $ 7 177,254 (166,459) (323)
Ending balance (in shares) at Jun. 30, 2021   72,736      
Beginning balance at Mar. 31, 2021 16,559 $ 7 175,046 (158,166) (328)
Beginning balance (in shares) at Mar. 31, 2021   71,204      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options, net of vesting of restricted shares 5   5    
Exercise of stock options, net of vesting of restricted shares (in shares)   11      
Release of restricted stock (in shares)   829      
Sales of common stock, net of issuance costs 832 $ 0 832    
Sales of common stock, net of issuance costs (in shares)   692      
Stock-based compensation expense 1,371   1,371    
Cumulative translation adjustment 5       5
Net loss (8,293)     (8,293)  
Ending balance at Jun. 30, 2021 $ 10,479 $ 7 $ 177,254 $ (166,459) $ (323)
Ending balance (in shares) at Jun. 30, 2021   72,736