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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Series A Convertible Preferred Stock
Series B Convertible Preferred Stock
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Treasury Stock
Beginning balance at Dec. 31, 2017 $ (26,369) $ 3     $ 13,691 $ (39,111) $ (952)
Beginning balance, Shares at Dec. 31, 2017   25,650,000   16,496,801      
Stock option exercises 20       20    
Stock option exercises, Shares       29,802      
Share-based compensation expense 151       189 (38)  
Net loss (9,012)         (9,012)  
Ending balance at Mar. 31, 2018 (35,210) $ 3     13,900 (48,161) (952)
Ending balance, Shares at Mar. 31, 2018   25,650,000   16,526,603      
Beginning balance at Dec. 31, 2017 (26,369) $ 3     13,691 (39,111) (952)
Beginning balance, Shares at Dec. 31, 2017   25,650,000   16,496,801      
Net loss (20,838)            
Ending balance at Jun. 30, 2018 41,106 $ 3 $ 2   102,040 (59,987) (952)
Ending balance, Shares at Jun. 30, 2018   25,650,000 17,579,843 16,592,052      
Beginning balance at Mar. 31, 2018 (35,210) $ 3     13,900 (48,161) (952)
Beginning balance, Shares at Mar. 31, 2018   25,650,000   16,526,603      
Issuance of Series B convertible preferred stock, net of issuance costs 87,826   $ 2   87,824    
Issuance of Series B convertible preferred stock, net of issuance costs, shares     17,579,843        
Stock option exercises 62       62    
Stock option exercises, Shares       65,449      
Share-based compensation expense 254       254    
Net loss (11,826)         (11,826)  
Ending balance at Jun. 30, 2018 41,106 $ 3 $ 2   102,040 (59,987) (952)
Ending balance, Shares at Jun. 30, 2018   25,650,000 17,579,843 16,592,052      
Beginning balance at Dec. 31, 2018 39,960 $ 3 $ 2   126,094 (85,187) (952)
Beginning balance, Shares at Dec. 31, 2018   25,650,000 21,956,095 16,717,117      
Stock option exercises 107       107    
Stock option exercises, Shares       145,975      
Share-based compensation expense 1,549       1,549    
Net loss (31,783)         (31,783)  
Ending balance at Mar. 31, 2019 10,830 $ 3 $ 2   127,750 (115,973) (952)
Ending balance, Shares at Mar. 31, 2019   25,650,000 21,956,095 16,863,092      
Beginning balance at Dec. 31, 2018 $ 39,960 $ 3 $ 2   126,094 (85,187) (952)
Beginning balance, Shares at Dec. 31, 2018   25,650,000 21,956,095 16,717,117      
Stock option exercises, Shares 376,247            
Net loss $ (51,219)            
Ending balance at Jun. 30, 2019 173,978       310,339 (135,409) (952)
Ending balance, Shares at Jun. 30, 2019       51,401,015      
Adjustment to beginning accumulated deficit from adoption of ASU2014-09 997         997  
Beginning balance at Mar. 31, 2019 10,830 $ 3 $ 2   127,750 (115,973) (952)
Beginning balance, Shares at Mar. 31, 2019   25,650,000 21,956,095 16,863,092      
Conversion of convertible preferred stock into common stock upon initial public offering   $ (3) $ (2)   5    
Conversion of convertible preferred stock into common stock upon initial public offering, shares   (25,650,000) (21,956,095) 22,301,190      
Issuance of common stock upon conversion of convertible notes 49,490       49,490    
Issuance of common stock upon conversion of convertible notes, shares       2,921,461      
Issuance of common stock in initial public offering, net of discounts and issuance costs 130,543       130,543    
Issuance of common stock in initial public offering, net of discounts and issuance costs, shares       9,085,000      
Stock option exercises 272       272    
Stock option exercises, Shares       230,272      
Share-based compensation expense 2,279       2,279    
Net loss (19,436)         (19,436)  
Ending balance at Jun. 30, 2019 $ 173,978       $ 310,339 $ (135,409) $ (952)
Ending balance, Shares at Jun. 30, 2019       51,401,015