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Organization - Public Offerings (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Nov. 08, 2019
Apr. 26, 2016
Mar. 29, 2016
Mar. 31, 2018
Mar. 31, 2020
Dec. 31, 2019
Public Offerings            
Accumulated deficit         $ (230,080) $ (217,145)
Cash, cash equivalents and short-term marketable securities         $ 68,700  
Common stock, par value (in dollars per share)         $ 0.0001 $ 0.0001
Exchange warrants issued         1,458,000  
Exchange Warrants            
Public Offerings            
Issuance of stock (in shares) 1,458,000       1,458,000  
Common stock, par value (in dollars per share) $ 0.0001       $ 0.0001  
Exchange warrants issued 1,458,000          
Warrant exercise price $ 0.0001          
Exchange warrant expiry term 10 years          
Percentage of shares owned by exchanging shareholders 9.99%          
Warrants Exercised         0  
Over-Allotment Option            
Public Offerings            
Shares Issued, Price Per Share   $ 15.00        
Issuance of stock (in shares)   502,618   1,058,823    
FPO            
Public Offerings            
Shares Issued, Price Per Share       $ 8.50    
Proceeds from sale of stock       $ 64,900    
Issuance of stock (in shares)       8,117,647    
IPO            
Public Offerings            
Shares Issued, Price Per Share     $ 15.00      
Net proceeds from IPO   $ 70,600        
Issuance of stock (in shares)     4,700,000