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Equity Offerings - Narrative (Details) - Distribution Agreement - USD ($) $ / shares in Units, shares in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Nov. 03, 2017 | Mar. 31, 2019 | Mar. 31, 2020
Subsidiary, Sale of Stock [Line Items] |  |  |
Maximum aggregate offering price | $ 125,000,000.0 |  |
Gross proceeds from sales of common stock |  | $ 20,600,000 |
Issuance costs on sales of common stock |  | $ 400,000 |
Number of shares sold (in shares) |  | 243 |
Price per share sold (in dollars per share) |  | $ 84.98 |
Aggregate value of shares available to be offered |  |  | $ 31,500,000

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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