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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | In the following table, revenue is disaggregated by source, commercial terms and method of revenue recognition.
Year ended December 31, |  | 2018 |  |  | 2017 |
Revenue by source |  |  |  |
Construction services |  | $ | 42,481 |  |  | $ | 21,710 |
Operations support services |  | 367,580 |  |  | 270,847 |
|  | $ | 410,061 |  |  | $ | 292,557 |
By commercial terms |  |  |  |
Time-and-materials |  | $ | 151,796 |  |  | $ | 97,588 |
Unit-price |  | 253,277 |  |  | 191,041 |
Cost-plus |  | 4,988 |  |  | 3,928 |
|  | $ | 410,061 |  |  | $ | 292,557 |
Revenue recognition method |  |  |  |
Cost-to-cost percent complete |  | $ | 186,741 |  |  | $ | 125,716 |
As-invoiced |  | 223,320 |  |  | 166,841 |
|  | $ | 410,061 |  |  | $ | 292,557 |
b) Customer revenues
Schedule of major customers | At December 31, 2018 and December 31, 2017, the following customers represented 10% or more of accounts receivable and contract assets:
|  | December 31, 2018 |  |  | December 31, 2017 |
Customer 1 |  | 33 | % |  | 42 | %
Customer 2 |  | 16 | % |  | 20 | %
Customer 3 |  | 12 | % |  | 10 | %
Customer 4 |  | 7 | % |  | 10 | %
Customer 5 |  | 4 | % |  | 12 | %
The following customers accounted for 10% or more of total revenues:
Year ended December 31, |  | 2018 |  |  | 2017 |
Customer A |  | 43 | % |  | 44 | %
Customer B |  | 23 | % |  | 26 | %
Customer C |  | 21 | % |  | 17 | %
Customer D |  | 9 | % |  | 11 | %
Contract balances | The following table provides information about receivables, contract assets, and contract liabilities from contracts with customers:
|  | December 31, 2018 |  |  | December 31, 2017 |
Contract receivables, included in accounts receivable, net |  | $ | 78,278 |  |  | $ | 45,716 |
Contract assets |  | 10,673 |  |  | 21,572 |
Contract liabilities |  | 4,032 |  |  | 824 |
The following table provides information about significant changes in the contract assets:
Year ended December 31, |  | 2018 |  |  | 2017 |
Transferred to receivables from contract assets recognized at the beginning of the period |  | $ | (14,701 | ) |  | $ | (9,129 | )
Increases as a result of changes to the estimate of the stage of completion, excluding amounts transferred in the period |  | 2,043 |  |  | 6,183 |
Increases as a result of work completed, but not yet an unconditional right to consideration |  | 409 |  |  | 8,554 |
Increases as a result of Nuna acquisition |  | 1,350 |  |  | — |
The following table provides information about significant changes in the contract liabilities:
Year ended December 31, |  | 2018 |  |  | 2017 |
Revenue recognized that was included in the contract liability balance at the beginning of the period |  | $ | (84 | ) |  | $ | (347 | )
Increases due to cash received, excluding amounts recognized as revenue during the period |  | 1,379 |  |  | 100 |
Increases as a result of Nuna acquisition |  | 1,913 |  |  | — |
The following table provides information about revenue recognized from performance obligations that were satisfied (or partially satisfied) in previous periods:
Year ended December 31, |  | 2018 |  |  | 2017 |
Revenue recognized |  | $ | 2,516 |  |  | $ | 1,177 |
Estimated revenue expected to be recognized in the future related to performance obligations | The estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period was $206,900 for 2019. Included is all consideration from contracts with customers, excluding amounts that are recognized using the as-invoiced method and any constrained amounts of revenue.
Summary of contract costs | The following table summarizes contract costs included within other assets on the consolidated balance sheets.
|  | December 31, 2018 |  |  | December 31, 2017 |
Reimbursable bid costs |  | $ | 670 |  |  | $ | 422 |
Fulfillment costs |  | 1,638 |  |  | — |
|  | $ | 2,308 |  |  | $ | 422 |

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