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Net Income (Loss) Per Share - Summary of Common Stock Issuance (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]            
Common stock, par value (in dollars per share) $ 0.01     $ 0.01   $ 0.01
Net proceeds $ 0 $ 73,781,000   $ 0 $ 122,668,000  
Common stock issued under "at the market" stock offering   $ 73,781,000 $ 48,887,000      
Aggregate Value of ATM Program $ 100,000,000     $ 100,000,000