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
 3 Months Ended 6 Months Ended
Jun. 09, 2020
Apr. 13, 2020
May 22, 2019
May 14, 2019
Jan. 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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                 $ 38,399    
Cash and cash equivalents           $ 38,062   $ 38,062   $ 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             $ 1,550   $ 1,550    
Accumulated deficit           (183,306)   (183,306)   (166,246)  
Deferred revenue as contract liabilities           $ 346   $ 346   $ 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   36,800,000 227,628    
Deferred offering costs             $ 4,861   $ 4,861    
Common Stock | 2020 Offering                      
Company And Significant Accounting Policies [Line Items]                      
Proceeds from issuance of public offering $ 24,992                    
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 $ 952                    
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     4,077,143   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