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Condensed Consolidated Statement of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Series A Redeemable Convertible Preferred Stock
Series B Redeemable Convertible Preferred Stock
Restricted Shares
Restricted stock units
Public Offering
At-the-Market Offering
Initial Public Offering
Common Stock
Common Stock
Restricted Shares
Common Stock
Restricted stock units
Common Stock
Public Offering
Common Stock
At-the-Market Offering
Common Stock
Initial Public Offering
Additional Pain In Capital
Additional Pain In Capital
Restricted Shares
Additional Pain In Capital
Restricted stock units
Additional Pain In Capital
Public Offering
Additional Pain In Capital
At-the-Market Offering
Additional Pain In Capital
Initial Public Offering
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2017 $ (31,929)               $ 1           $ 1,849           $ (33,779) $ 0
Balance, shares at Dec. 31, 2017                 4,562,640                          
Balance, temporary equity, shares at Dec. 31, 2017   15,527,951 4,792,716                                      
Balance, temporary equity at Dec. 31, 2017   $ 41,674 $ 39,946                                      
Conversion of convertible preferred stock into common stock upon the closing of initial public offering, Shares   (15,527,951) (4,792,716)           15,870,559                          
Conversion of convertible preferred stock into common stock upon the closing of initial public offering 81,620 $ (41,674) $ (39,946)           $ 1           81,619              
Issuance of common stock               $ 89,370           $ 1           $ 89,369    
Issuance of common stock, Shares                           6,516,667                
Vesting of restricted shares       $ 865                       $ 865            
Vesting of restricted shares, shares                   1,096,449                        
Stock-based compensation expense 316                           316              
Net loss (9,859)                                       (9,859)  
Balance at Mar. 31, 2018 130,383               $ 3           174,018           (43,638) 0
Balance, shares at Mar. 31, 2018                 28,046,315                          
Balance, temporary equity, shares at Mar. 31, 2018   0 0                                      
Balance, temporary equity at Mar. 31, 2018   $ 0 $ 0                                      
Balance at Dec. 31, 2017 (31,929)               $ 1           1,849           (33,779) 0
Balance, shares at Dec. 31, 2017                 4,562,640                          
Balance, temporary equity, shares at Dec. 31, 2017   15,527,951 4,792,716                                      
Balance, temporary equity at Dec. 31, 2017   $ 41,674 $ 39,946                                      
Net loss (31,857)                                          
Unrealized (loss) gain on marketable securities (76)                                          
Balance at Sep. 30, 2018 109,340               $ 3           175,049           (65,636) (76)
Balance, shares at Sep. 30, 2018                 28,046,815                          
Balance, temporary equity, shares at Sep. 30, 2018   0 0                                      
Balance, temporary equity at Sep. 30, 2018   $ 0 $ 0                                      
Balance at Mar. 31, 2018 130,383               $ 3           174,018           (43,638) 0
Balance, shares at Mar. 31, 2018                 28,046,315                          
Balance, temporary equity, shares at Mar. 31, 2018   0 0                                      
Balance, temporary equity at Mar. 31, 2018   $ 0 $ 0                                      
Stock-based compensation expense 402                           402              
Net loss (13,591)                                       (13,591)  
Unrealized (loss) gain on marketable securities (30)                                         (30)
Balance at Jun. 30, 2018 117,164               $ 3           174,420           (57,229) (30)
Balance, shares at Jun. 30, 2018                 28,046,315                          
Balance, temporary equity, shares at Jun. 30, 2018   0 0                                      
Balance, temporary equity at Jun. 30, 2018   $ 0 $ 0                                      
Vesting of restricted shares, shares                   500                        
Stock-based compensation expense 629                           629              
Net loss (8,407)                                       (8,407)  
Unrealized (loss) gain on marketable securities (46)                                         (46)
Balance at Sep. 30, 2018 109,340               $ 3           175,049           (65,636) (76)
Balance, shares at Sep. 30, 2018                 28,046,815                          
Balance, temporary equity, shares at Sep. 30, 2018   0 0                                      
Balance, temporary equity at Sep. 30, 2018   $ 0 $ 0                                      
Balance at Dec. 31, 2018 $ 104,204               $ 3           175,635           (71,393) (41)
Balance, shares at Dec. 31, 2018 28,054,344               28,054,344                          
Issuance of common stock           $ 46,585           $ 1           $ 46,584        
Issuance of common stock, Shares                       7,200,000                    
Vesting of restricted shares       $ 1                       $ 1            
Vesting of restricted shares, shares                   500                        
Stock-based compensation expense $ 662                           662              
Net loss (11,069)                                       (11,069)  
Unrealized (loss) gain on marketable securities 73                                         73
Balance at Mar. 31, 2019 140,456               $ 4           222,882           (82,462) 32
Balance, shares at Mar. 31, 2019                 35,254,844                          
Balance at Dec. 31, 2018 $ 104,204               $ 3           175,635           (71,393) (41)
Balance, shares at Dec. 31, 2018 28,054,344               28,054,344                          
Net loss $ (53,849)                                          
Unrealized (loss) gain on marketable securities 150                                          
Balance at Sep. 30, 2019 $ 109,764               $ 4           234,893           (125,242) 109
Balance, shares at Sep. 30, 2019 36,443,631               36,443,631                          
Balance at Mar. 31, 2019 $ 140,456               $ 4           222,882           (82,462) 32
Balance, shares at Mar. 31, 2019                 35,254,844                          
Issuance of common stock           $ 3,163 $ 582                     $ 3,163 $ 582      
Issuance of common stock, Shares                       487,934 62,663                  
Vesting of restricted shares, shares                   500                        
Vesting of restricted stock units, net of shares withheld for taxes         $ (15)                       $ (15)          
Vesting of restricted stock units, net of shares withheld for taxes, shares                     4,423                      
Exercise of stock options 6                           6              
Exercise of stock options, Shares                 7,029                          
Stock-based compensation expense 944                           944              
Net loss (18,332)                                       (18,332)  
Unrealized (loss) gain on marketable securities 138                                         138
Balance at Jun. 30, 2019 126,941               $ 4           227,561           (100,794) 170
Balance, shares at Jun. 30, 2019                 35,817,393                          
Issuance of common stock             $ 6,135                       $ 6,135      
Issuance of common stock, Shares                         625,137                  
Vesting of restricted stock units, net of shares withheld for taxes         $ (5)                       $ (5)          
Vesting of restricted stock units, net of shares withheld for taxes, shares                     1,101                      
Stock-based compensation expense 1,202                           1,202              
Net loss (24,448)                                       (24,448)  
Unrealized (loss) gain on marketable securities (61)                                         (61)
Balance at Sep. 30, 2019 $ 109,764               $ 4           $ 234,893           $ (125,242) $ 109
Balance, shares at Sep. 30, 2019 36,443,631               36,443,631