Annual report pursuant to Section 13 and 15(d)

Organization and Description of the Business - Additional Information (Details)

v3.20.1
Organization and Description of the Business - Additional Information (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 04, 2020
USD ($)
$ / shares
shares
Jun. 25, 2018
USD ($)
$ / shares
shares
Jun. 08, 2018
$ / shares
Dec. 31, 2019
USD ($)
Segment
shares
Dec. 31, 2018
USD ($)
shares
Organization And Description Of Business [Line Items]          
Number of operating segments | Segment       1  
Stockholders equity, reverse stock split     1-for-5.62    
Stockholders equity, stock split, conversion ratio     0.1779    
Minimum price post-split | $ / shares     $ 15.884    
Adjusted price post split | $ / shares     $ 7.942    
Net proceeds from issuance of common stock | $         $ 77,695
Common stock, shares authorized       125,000,000 125,000,000
Preferred stock, shares authorized       10,000,000 10,000,000
Accumulated deficit | $       $ 84,282 $ 49,195
Minimum          
Organization And Description Of Business [Line Items]          
Sufficient cash and cash equivalents available period term       12 months  
IPO          
Organization And Description Of Business [Line Items]          
Common stock, shares, issued   5,750,000      
Common stock, shares issued, price per share | $ / shares   $ 15.00      
Net proceeds from issuance of common stock | $   $ 77,700      
Payments of stock issuance costs | $   $ 8,600      
Convertible preferred stock converted into common stock   12,263,126      
Overallotment Option          
Organization And Description Of Business [Line Items]          
Common stock, shares, issued   750,000      
Underwritten Public Offering | Subsequent Event          
Organization And Description Of Business [Line Items]          
Common stock, shares, issued 18,965,385        
Common stock, shares issued, price per share | $ / shares $ 2.60        
Net proceeds from issuance of common stock | $ $ 53,300