XML 45 R33.htm IDEA: XBRL DOCUMENT v3.20.2
Summary of significant accounting policies - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
$ / shares
Sep. 30, 2019
USD ($)
Research and Development Expense [Abstract]        
Reverse stock split ratio     6  
Change in fair value of warrant liability $ 5,549,000   $ 5,549,000  
Research And Development Milestone Expense $ 0 $ 0 $ 0 $ 0
Number of Operating Segments | segment     1  
IPO share price per share | $ / shares $ 12.00   $ 12.00