Stockholders' Equity - Narrative (Details) - USD ($)		6 Months Ended
	May 13, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 12, 2018
Class of Stock [Line Items]
Common stock, par value (in dollars per share)		$ 0.0001		$ 0.0001
Issuance of common stock, net of issuance costs		$ 41,000	$ 151,535,000
Target payout percentage		100.00%
Performance restricted stock units
Class of Stock [Line Items]
Performance period		18 months
Minimum | Performance restricted stock units
Class of Stock [Line Items]
Award vesting rights, percentage		0.00%
Maximum | Performance restricted stock units
Class of Stock [Line Items]
Award vesting rights, percentage		300.00%
Chief Executive Officer | Performance restricted stock units
Class of Stock [Line Items]
Award vesting rights, percentage		50.00%
Public Offering
Class of Stock [Line Items]
Additional registration of shares of aggregate amount (up to)					$ 250,000,000.0
Common stock, par value (in dollars per share)	$ 0.0001
Offering price per share (in dollars per share)	$ 42.00
Issuance of common stock, net of issuance costs	$ 151,100,000
Payments of stock issuance costs	$ 8,300,000
Over-Allotment Option
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	3,795,000
Shares exercisable to purchase additional shares granted (in shares)	495,000