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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions | Apr. 24, 2020 | Apr. 23, 2020 | Jan. 22, 2019 | Mar. 31, 2020
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Subsequent Event [Line Items] |  |  |  |
Maximum borrowing capacity |  |  |  | $ 75.0
Promissory Note |  |  |  |
Interest rate (as a percent) |  |  | 6.85% |
Subsequent event | Maximum |  |  |  |
Subsequent Event [Line Items] |  |  |  |
CARES Act, secured loans to airline industry | $ 25,000.0 |  |  |
PSP agreement | Subsequent event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Grants receivable |  | $ 438.0 |  |
Grants Received Percentage |  | 50.00% |  |
PSP agreement | Subsequent event | Warrant Shares |  |  |  |
Warrants and Rights Note Disclosure [Abstract] |  |  |  |
Warrants to purchase shares |  | 357,317 |  |
Warrants exercise price |  | $ 28.38 |  |
PSP agreement | Subsequent event | Common stock warrants |  |  |  |
Warrants and Rights Note Disclosure [Abstract] |  |  |  |
Warrants to purchase shares |  | 125,804 |  |
Quotient percentage for additional warrants to be issued |  | 0.1 |  |
PSP agreement | Subsequent event | Promissory note |  |  |  |
Promissory Note |  |  |  |
Principal amount |  | $ 35.7 |  |
Increase in principal amount (Percentage) |  | 30.00% |  |
Represents the number of days for voluntary prepayments of amounts due under the Promissory Note without penalty or premium. |  | 30 days |  |
PSP agreement | Subsequent event | Promissory note | Maximum |  |  |  |
Promissory Note |  |  |  |
Principal amount |  | $ 101.4 |  |
PSP agreement | Subsequent event | Direct grant | Maximum |  |  |  |
Promissory Note |  |  |  |
Principal amount |  | $ 336.6 |  |
PSP agreement | Subsequent event | Until the fifth anniversary of the Closing Date | Promissory note |  |  |  |
Promissory Note |  |  |  |
Interest rate (as a percent) |  | 1.00% |  |
PSP agreement | Subsequent event | Thereafter until the tenth anniversary of the Closing Date | Promissory note |  |  |  |
Promissory Note |  |  |  |
Interest rate (as a percent) |  | 2.00% |  |
PSP agreement | Subsequent event | Thereafter until the tenth anniversary of the Closing Date | Promissory note | Minimum |  |  |  |
Promissory Note |  |  |  |
Interest rate (as a percent) |  | 0.00% |  |
Loan Program | Subsequent event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Maximum borrowing capacity | $ 497.0 |  |  |

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- Definition Approximate amount of secured loans to airline industry under Coronavirus Aid, Relief, and Economic Security Act. + References No definition available. + Details
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