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Contract Assets and Contract Liabilities - Summary of Accounts Receivable and Unbilled, Net (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Contract With Customer Asset And Liability [Line Items] |  |  |
Accounts receivable | $ 67,616 |  | $ 55,599
Unbilled receivables | 43,688 |  | 28,153
Less: allowance for doubtful accounts | (650) |  | (673)
Total accounts receivable and unbilled, net | 110,654 |  | $ 83,079
ASC 606 |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |
Accounts receivable |  | $ 55,599 |
Unbilled receivables |  | 37,906 |
Less: allowance for doubtful accounts |  | (673) |
Total accounts receivable and unbilled, net |  | 92,832 |
ASC 606 | Impact of Adoption of ASC 606 - Adjustments |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |
Unbilled receivables |  | 9,753 |
Total accounts receivable and unbilled, net | $ (12,733) | $ 9,753 |

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