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Stockholders' Equity - Equity Offerings (Details) - September 2017 At-The-Market - Common Stock - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Sep. 28, 2017
Equity offerings |  |  |
Common stock available for sale under agreement | $ 80.0 |  |
Securities sold during period | 0 | 0 |
Maximum |  |  |
Equity offerings |  |  |
Common stock available for sale under agreement |  |  | $ 100.0

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- Definition Amount of common stock remaining available to be sold under the terms of the agreement at the end of the period. + References No definition available. + Details
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- Definition The increase (decrease) during the period in the number of shares issued. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- Details
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- Details
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