Stockholders' Equity At-the-Market Offering (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Subsidiary, Sale of Stock [Line Items] | ||
| Number of shares authorized to be sold under equity distribution agreement (in shares) | 35,000,000 | |
| Number of common shares issued under equity distribution agreement and outstanding as of period-end (in shares) | 7,490,235 | |
| Accumulated proceeds from issuance of common shares under equity distribution agreement | $ 128.6 | |
| At the Market Offering [Member] | ||
| Subsidiary, Sale of Stock [Line Items] | ||
| Number of shares of stock issued during period (in shares) | 0 | 3,665,300 |
| Issuance of stock, net of offering costs | $ 0.0 | $ 50.6 |
| X | ||||||||||
- Definition The number of shares authorized to be sold under an at-the-market Equity Distribution Agreement. No definition available.
|
| X | ||||||||||
- Definition Number of shares issued and outstanding as of period-end from an at-the-market common stock offering. No definition available.
|
| X | ||||||||||
- Definition Proceeds from (value of) stock issued and outstanding as of period-end from an at-the-market common stock offering. No definition available.
|
| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|