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Revenue - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | $ 566 |  |
Balance at end of period | 7,336 | $ 566 |
Accounts Receivable |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Beginning balance | 566 | 779 | $ 1,181
Provision for credit losses | 7,418 | (74) | 417
Recoveries/charged-off | (648) | (139) | (819)
Balance at end of period | 7,336 | $ 566 | $ 779
Unbilled Contracts Receivable |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Provision for credit losses | 2,231 |  |
Balance at end of period | $ 2,231 |  |

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