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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended	9 Months Ended
	Oct. 31, 2019	Jun. 30, 2018	Apr. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Subsequent Event [Line Items]
Net proceeds from sale of common stock		$ 194,400	$ 168,700			$ 363,128
Payments of stock issuance costs					$ 110
Common Stock
Subsequent Event [Line Items]
Issuance of common stock in public offerings, net (in shares)		5,100,000	6,900,000	11,963,000
Share price		$ 39.50	$ 26.00	$ 39.50
Payments of stock issuance costs		$ 5,600	$ 10,700
Subsequent Event
Subsequent Event [Line Items]
Net proceeds from sale of common stock	$ 162,200
Subsequent Event | Common Stock
Subsequent Event [Line Items]
Issuance of common stock in public offerings, net (in shares)	9,900,000
Share price	$ 17.50
Payments of stock issuance costs	$ 10,300

X

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Definition

Number of new stock issued during the period.

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-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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