Impact of COVID-19 -CARES Act (Details) - USD ($)				1 Months Ended
	May 06, 2020	Apr. 21, 2020	Apr. 20, 2020	May 06, 2020	Apr. 29, 2020
Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Shares of common stock subject to warrants issued to the United States Treasury (in shares)		143,541
Strike price (USD per share)			$ 14.08
Proceeds from Payroll Support Program		$ 167,400,000
Subsequent Event | Payroll Support Program, Low-Interest Loan
Unusual or Infrequent Item, or Both [Line Items]
Percent of outstanding common stock					1.00%
Subsequent Event | Notes Payable To United States Treasury
Unusual or Infrequent Item, or Both [Line Items]
Term			10 years
Principal amount			$ 20,200,000
Forecast
Unusual or Infrequent Item, or Both [Line Items]
Maximum expected proceeds to be received from Payroll Support Program			334,700,000
Maximum expected proceeds from Payroll Support Program, direct grant from Treasury			264,300,000
Maximum expected proceeds from Payroll Support Program, low-interest loan			$ 70,400,000
Term				5 years
Shares of common stock subject to warrants issued to the United States Treasury (in shares)	5,300,000			5,300,000
Expected maximum availability from CARES Act Loan Program				$ 741,000,000
Expected current year refunds and expense savings from CARES Act	$ 180,000,000
Additional liquidity expected due to deferred payment of employer portion of social security taxes from CARES Act	$ 24,000,000
Forecast | Payroll Support Program, Low-Interest Loan
Unusual or Infrequent Item, or Both [Line Items]
Term			10 years
Forecast | Notes Payable To United States Treasury
Unusual or Infrequent Item, or Both [Line Items]
Principal amount			$ 70,400,000
Forecast | Maximum
Unusual or Infrequent Item, or Both [Line Items]
Shares of common stock subject to warrants issued to the United States Treasury (in shares)			500,150