Stockholders' Equity (Details) - USD ($)				6 Months Ended
	May 01, 2020	Dec. 09, 2019	Mar. 29, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 18, 2020	Jun. 17, 2020	Dec. 31, 2019
Class of Warrant or Right [Line Items]
Common and preferred stock, shares authorized (in shares)						285,000,000	260,000,000
Common stock, shares authorized (in shares)				275,000,000,000		275,000,000	250,000,000	250,000,000,000
Preferred stock, shares authorized (in shares)						10,000,000	10,000,000
Proceeds from issuance of common stock				$ 464,593,000	$ 5,829,000
Common stock, par value (in usd per share)				$ 0.01				$ 0.01
Public Offering
Class of Warrant or Right [Line Items]
Sale of stock (in shares)	16,947,389	16,428,572
Shares issued, price per share (in usd per share)	$ 28.50	$ 17.50
Over-Allotment Option
Class of Warrant or Right [Line Items]
Proceeds from issuance of common stock	$ 464,600,000	$ 273,000,000.0
Proceeds from sale of stock, gross	$ 483,000,000.0	$ 287,500,000
ATM Agreement
Class of Warrant or Right [Line Items]
Sale of stock (in shares)			4,432,416	0
Proceeds from issuance of common stock			$ 71,600,000
Sale of stock, consideration received on transaction			$ 150,000,000.0
Percentage of payments for stock issuance costs			3.00%
Sales Agreement
Class of Warrant or Right [Line Items]
Value of non-cash consideration received (in shares)					84,896
Weighted Average | ATM Agreement
Class of Warrant or Right [Line Items]
Shares issued, price per share (in usd per share)			$ 16.40