Stockholders' Equity - Capital Structure (Details)	1 Months Ended		3 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares	May 31, 2019 USD ($)	Mar. 31, 2020 USD ($) Vote / shares	Dec. 16, 2016 USD ($)
Subsidiary, Sale of Stock [Line Items]
Common stock sales agreement, authorized amount	$ 80,000,000	$ 50,000,000
Common stock sales agreement, gross sales			$ 0
Common stock sales agreement, commission percentage	3.00%	3.00%
Common stock, voting right per share | Vote / shares			1
Underwritten Public Offering
Subsidiary, Sale of Stock [Line Items]
Shares issued | shares	2,300,000
Share Price | $ / shares	$ 87.00
Proceeds from issuance of common stock, gross	$ 200,100,000
Proceeds from issuance of common stock, net	$ 187,100,000
2016 Shelf Registration
Subsidiary, Sale of Stock [Line Items]
Shelf Registration Statement, maximum aggregate amount issuable				$ 150,000,000
2019 Shelf Registration
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock, gross			$ 207,400,000