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Liquidity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Jul. 31, 2020
Jan. 09, 2020
Jan. 02, 2020
Sep. 30, 2020
Dec. 31, 2019
Dec. 30, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Number of shares of stock (in shares)       0 524,097 75,000
Common stock to be called by warrants (in shares)   818,900        
Net proceeds of common stock     $ 300   $ 2,700 $ 300
Cash and cash equivalents       $ 8,203 7,277  
Restricted cash and cash equivalents       100 100  
Accumulated deficit       114,188 $ 101,147  
Accounts payable and accrued liabilities       $ 4,200    
Pre-Funded Warrants            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Net proceeds of common stock   $ 6,000        
Offering price (in dollars per share)   $ 3.9725        
Warrants exercisable (in shares)   448,800        
Gross proceeds from warrant exercises   $ 6,500        
PIPE Investors            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Number of shares of stock (in shares) 2,744,078          
Common stock to be called by warrants (in shares) 2,744,078          
Stock price per share (in dollars per share) $ 3.335          
Warrant exercise price (in dollars per share) $ 3.30          
Warrant term 5 years          
Net proceeds of common stock $ 8,500          
Investor            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Warrant exercise price (in dollars per share)   $ 3.93        
Warrant term   5 years 6 months        
Aggregate common stock (in shares)   1,189,000        
Offering price (in dollars per share)   $ 3.9825