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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Apr. 02, 2018
May 03, 2017
Apr. 26, 2017
Feb. 28, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]              
Common stock, shares authorized (in shares)         125,000,000 125,000,000  
Common stock, par value (in dollars per share)         $ 0.01 $ 0.01  
Proceeds from issuance of common stock, net of offering costs         $ 118,657 $ 103,259 $ 34,244
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  
Undesignated preferred stock, shares outstanding (in shares)         0 0  
Registered Direct Offering              
Class of Stock [Line Items]              
Issuance of common stock, net of offering costs (in shares)     1,100,000        
Number of shares issued or sold (in shares)     1,100,000        
Common stock purchase price (in dollars per share)     $ 21.50        
Proceeds from issuance of common stock, net of offering costs     $ 23,700        
At The Market Offering              
Class of Stock [Line Items]              
Issuance of common stock, net of offering costs (in shares)   599,284          
Number of shares issued or sold (in shares)   599,284          
Common stock maximum amount available for issuance   $ 75,000          
Proceeds of stock sale   $ 10,800          
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