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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Apr. 02, 2018
Jun. 30, 2020
Dec. 31, 2019
Feb. 28, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]              
Common stock, shares authorized (in shares)         125,000,000    
Common stock, par value (in dollars per share)         $ 0.01    
Proceeds from issuance of common stock, net of offering costs         $ 170,456 $ 118,657 $ 103,259
Undesignated Preferred Stock              
Class of Stock [Line Items]              
Undesignated preferred stock, shares authorized (in shares)         5,000,000    
Undesignated preferred stock, par value (in dollars per share)         $ 0.01    
Undesignated preferred stock, shares issued (in shares)     0   0 0  
Undesignated preferred stock, shares outstanding (in shares)     0   0 0  
Firm Commitment Public Underwritten Offer              
Class of Stock [Line Items]              
Sale of common stock (in shares) 4,500,000            
Sale of common stock (in dollars per share) $ 21.25            
Proceeds of stock sale $ 103,300            
Over-Allotment Option              
Class of Stock [Line Items]              
Issuance of common stock, net of offering costs (in shares)       825,000      
Number of shares issued or sold (in shares)       825,000      
Common stock purchase price (in dollars per share)       $ 20.00      
Sale of common stock (in shares) 675,000            
Sale of common stock (in dollars per share) $ 21.25            
Follow-On Equity Offering              
Class of Stock [Line Items]              
Issuance of common stock, net of offering costs (in shares)       5,500,000      
Number of shares issued or sold (in shares)       5,500,000      
Common stock purchase price (in dollars per share)       $ 20.00      
Proceeds from issuance of common stock, net of offering costs       $ 118,700      
At The Market Offering              
Class of Stock [Line Items]              
Common stock maximum amount available for issuance   $ 175,000 $ 50,000        
Sale of common stock (in shares)         6,612,815    
Sale of common stock (in dollars per share)         $ 26.46    
Proceeds of stock sale         $ 170,500