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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

X

- 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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Balance Type:	debit
Period Type:	instant

X

- 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

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- References

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- Details

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