Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions	1 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2021 vote $ / shares shares	May 31, 2021 shares	Apr. 30, 2021 shares	Jun. 30, 2020 USD ($)
Subsidiary, Sale of Stock [Line Items]
Preferred stock authorized (shares)			10,000,000		10,000,000
Preferred stock par value (in usd per share) | $ / shares			$ 0.001		$ 0.001
Preferred stock issued (shares)			0		0
Preferred stock outstanding (shares)			0		0
Common stock authorized (shares)			100,000,000		200,000,000	200,000,000	100,000,000
Common stock, par value (in usd per share) | $ / shares			$ 0.001		$ 0.001
Number of votes entitled to for each common share held | vote					1
Common stock issued (shares)			55,736,000		56,095,000
Common stock outstanding (shares)			55,736,000		56,095,000
Common stock authorized for issuance and unreserved (shares)					116,900,000
Stock issued (shares)			200,000
Net proceeds from stock issuance | $			$ 4.9
Gross aggregate proceeds authorized under offering | $								$ 200.0
ATM
Subsidiary, Sale of Stock [Line Items]
Gross aggregate proceeds to be received upon stock issuance | $		$ 75.0
Stock issued (shares)				900,000
Net proceeds from stock issuance | $				$ 42.6
Underwritten Public Offer
Subsidiary, Sale of Stock [Line Items]
Stock issued (shares)	9,800,000
Net proceeds from stock issuance | $	$ 221.7
Stock offer price (in usd per share) | $ / shares	$ 23.50
Over-Allotment option
Subsidiary, Sale of Stock [Line Items]
Stock issued (shares)	1,300,000