Quarterly report pursuant to Section 13 or 15(d)

Convertible Notes - Additional Information (Details)

v3.19.3
Convertible Notes - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Oct. 31, 2018
May 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]        
Proceeds from convertible preferred stock     $ 50,000  
Convertible preferred stock issued       0
Series A Convertible Preferred Stock        
Debt Instrument [Line Items]        
Proceeds from convertible preferred stock $ 12,744      
Convertible preferred stock issued 3,146,551      
Series A-1 Convertible Preferred Stock        
Debt Instrument [Line Items]        
Proceeds from convertible preferred stock $ 12,567      
Convertible preferred stock issued 4,553,452      
Conversion price per share $ 2.76      
Accrued interest $ 409      
Conversion of preferred stock to convertible preferred stock 2,819,267      
Series A-2 Convertible Preferred Stock        
Debt Instrument [Line Items]        
Conversion price per share $ 2.76      
Conversion of preferred stock to convertible preferred stock 1,873,777      
Convertible Notes        
Debt Instrument [Line Items]        
Proceeds from issuance of debt   $ 12,535    
Debt instrument, stated interest rate   7.50%    
Proceeds from convertible preferred stock   $ 12,567    
Fair value of convertible notes issued   12,535    
Fair value, debt instrument volatility rate 71.00%      
Fair value, debt instrument term 1 year 3 months 18 days      
Fair value, debt instrument weighted average discount rate for lack of marketability 35.00%      
Fair value adjustments on the convertible notes       $ 6,244
Convertible Notes | General and Administrative Expense        
Debt Instrument [Line Items]        
Debt issuance costs   53    
Convertible Notes | Series A-1 Convertible Preferred Stock        
Debt Instrument [Line Items]        
Share price $ 3.39      
Convertible Notes | Series A-2 Convertible Preferred Stock        
Debt Instrument [Line Items]        
Share price $ 3.39      
Penn | Convertible Notes        
Debt Instrument [Line Items]        
Proceeds from issuance of debt   $ 5,000