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Stockholders' Equity - Schedule of Public Offering of Common Stock (Details) - Underwritten Public Offering - Common Stock - USD ($) $ in Thousands | 1 Months Ended
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May 31, 2019 | Mar. 31, 2019 | Jan. 31, 2019
Class of Stock [Line Items] |  |  |
Shares Issued | 20,700,000 | 17,250,000 | 14,490,000
Net Proceeds | $ 123,102 | $ 101,160 | $ 83,772

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