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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Retained Earnings
Beginning balance (in shares) at Dec. 31, 2014   0 17,852    
Beginning balance, amount at Dec. 31, 2014 $ 1,504 $ 0 $ 18 $ 29,334 $ (27,848)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Options exercised (in shares)     98    
Options exercised 220     220  
Warrants exercised (in shares)     739    
Warrants exercised 1,519     1,519  
Issuance of common stock (in shares)     5,219    
Issuance of common stock 11,531   $ 5 11,526  
Conversion of Series A Preferred stock and common warrants to Series B preferred stock (in shares)   3,588      
Conversion of Series A preferred stock and common warrants to Series B preferred stock 13,920 $ 4   (40) 13,956
Conversion of Series B convertible preferred to common stock (in shares)   (1,612) 3,225    
Conversion of Series B convertible preferred to common stock 0 $ (2) $ 4 (2)  
Stock based compensation 575     575  
Stock swap to acquire options and warrants (in shares)     (81)    
Stock swap to acquire options and warrants (273)     (273)  
Accretion on convertible preferred stock (222)       (222)
Net loss (5,370)       (5,370)
Ending balance (in shares) at Dec. 31, 2015   1,976 27,052    
Ending balance, amount at Dec. 31, 2015 23,404 $ 2 $ 27 42,859 (19,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Options exercised (in shares)     36    
Options exercised 130     130  
Warrants exercised (in shares)     293    
Warrants exercised 698     698  
Issuance of common stock (in shares)     1,625    
Issuance of common stock 5,830   $ 2 5,828  
Conversion of Series B convertible preferred to common stock (in shares)   (1,000) 2,000    
Conversion of Series B convertible preferred to common stock 0 $ (1) $ 2 (1)  
Stock based compensation 809     809  
Stock swap to acquire options and warrants (in shares)     (146)    
Stock swap to acquire options and warrants (698)     (698)  
Net loss (3,950)       (3,950)
Ending balance (in shares) at Dec. 31, 2016   976 30,860    
Ending balance, amount at Dec. 31, 2016 26,223 $ 1 $ 31 49,625 (23,434)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Options exercised (in shares)     177    
Options exercised 427     427  
Warrants exercised (in shares)     54    
Warrants exercised 130     130  
Conversion of Series B convertible preferred to common stock (in shares)   (976) 1,951    
Conversion of Series B convertible preferred to common stock 0 $ (1) $ 2 (1)  
Stock based compensation 871     871  
Stock swap to acquire options and warrants (in shares)     (164)    
Stock swap to acquire options and warrants (557)     (557)  
Net loss (5,062)       (5,062)
Ending balance (in shares) at Dec. 31, 2017   0 32,878    
Ending balance, amount at Dec. 31, 2017 $ 22,032 $ 0 $ 33 $ 50,495 $ (28,496)