Quarterly report pursuant to Section 13 or 15(d)

The Company and its Significant Accounting Policies - Additional Information (Details)

v3.20.2
The Company and its Significant Accounting Policies - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 9 Months Ended
Jun. 09, 2020
Apr. 13, 2020
May 22, 2019
May 14, 2019
Jan. 01, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Company And Significant Accounting Policies [Line Items]                    
Entity incorporation date             Aug. 05, 1999      
Proceeds from issuance of public offering               $ 37,180    
Cash and cash equivalents             $ 31,672   $ 11,298  
Proceeds from PPP Loan             2,289      
IPO closing date               May 14, 2019    
Unpaid issuance costs and charged to accounts payable or accrued expenses               $ 331    
Accumulated deficit             (189,770)   (166,246)  
Deferred revenue as contract liabilities             $ 290   $ 291  
Topic 606 | Revision of Prior Period, Adjustment                    
Company And Significant Accounting Policies [Line Items]                    
Accumulated deficit         $ 3,115          
Cumulative effect adjustment associated tax effect to reduce accumulated deficit         215          
Deferred revenue as contract liabilities         $ 770          
2020 Offering                    
Company And Significant Accounting Policies [Line Items]                    
IPO closing date             Jun. 09, 2020      
Cares Act                    
Company And Significant Accounting Policies [Line Items]                    
Proceeds from PPP Loan   $ 2,300                
Common Stock                    
Company And Significant Accounting Policies [Line Items]                    
Proceeds from issuance of public offering           $ 25,000        
Redemption of common stock           $ 10,000        
Issuance of common stock, net of issuance costs, shares             36,800,000 227,628    
Deferred offering costs               $ 4,798    
Common Stock | 2020 Offering                    
Company And Significant Accounting Policies [Line Items]                    
Proceeds from issuance of public offering $ 25,056                  
Issuance of common stock, net of issuance costs, shares 36,800,000                  
Shares issued and sold, price per share $ 0.75                  
Underwriting discounts and commissions $ 1,656                  
Offering expenses paid $ 719                  
Common Stock | IPO                    
Company And Significant Accounting Policies [Line Items]                    
Proceeds from issuance of public offering     $ 36,849              
Issuance of common stock, net of issuance costs, shares     505,714 3,571,429       4,297,901    
Shares issued and sold, price per share     $ 11.00 $ 11.00            
Underwriting discounts and commissions     $ 3,139              
Offering expenses paid     $ 4,861              
Deferred offering costs                   $ 63
Common Stock | Over-Allotment                    
Company And Significant Accounting Policies [Line Items]                    
Issuance of common stock, net of issuance costs, shares     30,000              
Shares issued and sold, price per share     $ 11.00