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Common Stock - Public Offering (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 25, 2020
USD ($)
shares
Jun. 22, 2020
$ / shares
shares
Jul. 11, 2019
USD ($)
$ / shares
shares
Feb. 05, 2019
USD ($)
item
$ / shares
shares
Dec. 31, 2020
USD ($)
Vote
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Common stock, par value (in dollars per share) | $ / shares         $ 0.001 $ 0.001
Issuance of common stock (value) | $       $ 12,122   $ 12,122
Common stock issued | shares       7,557,142    
Price per share (in dollars per share) | $ / shares       $ 1.75    
Proceeds from issuance of common stock from ATM sales | $           1,923
Proceeds from issuance of common stock in connection with July 2019 Lincoln Park Capital Registered Offering Purchase Agreement, net of issuance costs | $           1,000
Number of Vote on Common Shares | Vote         1  
Dividends, Common Stock | $         $ 0  
2019 Warrants            
Exercise price of warrant | $ / shares       $ 1.95    
Warrant to purchase shares of common stock | shares       7,557,142    
Warrants and Rights Outstanding, Term       7 years    
Number of share for warrant to purchase of common stock | item       1    
June 2020 Warrants            
Exercise price of warrant | $ / shares   $ 0.001        
Warrant to purchase shares of common stock | shares   2,250,000        
Distribution Agreement            
Common stock issued | shares         1,033,147  
Commons Stock Value Maximum Right To Sell | $         $ 30,000  
Proceeds from issuance of common stock from ATM sales | $         $ 1,923  
Lincoln Park Purchase Agreements            
Common stock, par value (in dollars per share) | $ / shares     $ 0.001      
Common stock issued | shares     571,429      
Price per share (in dollars per share) | $ / shares     $ 1.75      
Commons Stock Value Maximum Right To Sell | $     $ 20,000      
Stock Issued During Period, Shares, Issued for Services | shares     330,000      
Proceeds from issuance of common stock in connection with July 2019 Lincoln Park Capital Registered Offering Purchase Agreement, net of issuance costs | $     $ 1,000      
Underwriters' exercise            
Common stock issued | shares       985,714    
Common Stock            
Issuance of common stock (value) | $           $ 7
Common stock issued | shares           7,557,142
Common Stock | June 2020 Warrants            
Common stock issued | shares   20,250,000        
Share Price | $ / shares   $ 2.00        
Net proceeds from issuance of common stock | $ $ 48,276          
Common Stock | Underwriters' exercise | June 2020 Warrants            
Common stock issued | shares 3,375,000