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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Restricted stock units
Initial Public Offering
At-the-Market Offering
Common Stock
Common Stock
Restricted stock units
Common Stock
Initial Public Offering
Common Stock
At-the-Market Offering
Additional Pain In Capital
Additional Pain In Capital
Restricted stock units
Additional Pain In Capital
Initial Public Offering
Additional Pain In Capital
At-the-Market Offering
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Series A Redeemable Convertible Preferred Stock
Series B Redeemable Convertible Preferred Stock
Balance at Dec. 31, 2016 $ 0       $ 1       $ 0       $ (1) $ 0    
Balance, shares at Dec. 31, 2016         2,082,860                      
Issuance of common shares to PureTech, shares         1,886,363                      
Issuance of redeemable convertible preferred stock                             $ 41,674 $ 39,946
Issuance of redeemable convertible preferred stock, shares                             15,527,951 4,792,716
Issuance of redeemable convertible preferred stock, adjustments to additional paid in capital 1,379               1,379              
Vesting of restricted shares, shares         593,417                      
Stock-based compensation expense 470               470              
Net loss (33,778)                       (33,778)      
Balance at Dec. 31, 2017 (31,929)       $ 1       1,849       (33,779)      
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
Balance, shares at Dec. 31, 2017         4,562,640                      
Conversion of convertible preferred stock into common stock upon the closing of initial public offering 81,620       $ 1       81,619           $ (41,674) $ (39,946)
Conversion of convertible preferred stock into common stock upon the closing of initial public offering, Shares         15,870,559                   (15,527,951) (4,792,716)
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         1,097,449                      
Exercise of stock options 5               5              
Exercise of stock options, Shares         7,029                      
Stock-based compensation expense 1,928               1,928              
Net loss (37,614)                       (37,614)      
Net unrealized gains (losses) on marketable securities (41)                         (41)    
Balance at Dec. 31, 2018 104,204       $ 3       175,635       (71,393) (41)    
Balance, temporary equity, shares at Dec. 31, 2018                             0 0
Balance, temporary equity at Dec. 31, 2018                             $ 0 $ 0
Balance, shares at Dec. 31, 2018         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)      
Net unrealized gains (losses) 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, temporary equity, shares at Dec. 31, 2018                             0 0
Balance, temporary equity at Dec. 31, 2018                             $ 0 $ 0
Balance, shares at Dec. 31, 2018         28,054,344                      
Vesting of restricted stock units, net of shares withheld for taxes   $ (20)               $ (20)            
Vesting of restricted stock units, net of shares withheld for taxes, shares           6,625                    
Issuance of common stock     $ 49,747 $ 6,716     $ 1       $ 49,746 $ 6,716        
Issuance of common stock, Shares             7,687,934 687,800                
Vesting of restricted shares 1               1              
Vesting of restricted shares, shares         1,000                      
Exercise of stock options 6               6              
Exercise of stock options, Shares         7,029                      
Stock-based compensation expense 3,693               3,693              
Net loss (82,739)                       (82,739)      
Net unrealized gains (losses) on marketable securities 90                         90    
Balance at Dec. 31, 2019 81,698       $ 4       235,777       (154,132) 49    
Balance, shares at Dec. 31, 2019         36,444,732                      
Vesting of restricted stock units, net of shares withheld for taxes   $ (1)               $ (1)            
Vesting of restricted stock units, net of shares withheld for taxes, shares           1,019                    
Stock-based compensation expense 975               975              
Net loss (7,038)                       (7,038)      
Net unrealized gains (losses) on marketable securities (17)                         (17)    
Balance at Mar. 31, 2020 $ 75,617       $ 4       $ 236,751       $ (161,170) $ 32    
Balance, shares at Mar. 31, 2020         36,445,751