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Liquidity (Details) - USD ($)
$ / shares in Units, $ in Thousands
Nov. 25, 2019
Jun. 11, 2018
Dec. 31, 2019
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]        
Cash and cash equivalents     $ 147,144 $ 200,990
Public Offering        
Subsidiary, Sale of Stock [Line Items]        
Number of shares issued (in shares) 5,500,000 5,750,000    
Price per share (usd per share) $ 9.75 $ 22.25    
Consideration received on transaction $ 38,747 $ 59,917    
Fees and commissions 2,383      
Deferred offering costs $ 308 $ 373    
The Company | Public Offering        
Subsidiary, Sale of Stock [Line Items]        
Number of shares issued (in shares) 4,250,000 2,875,000    
Certain Stockholders | Public Offering        
Subsidiary, Sale of Stock [Line Items]        
Number of shares issued (in shares) 1,250,000 2,875,000