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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue |
Year ended December 31, |  | 2019 |  |  | 2018 |
Revenue by source |  |  |  |
Construction services |  | $ | 132,310 |  |  | $ | 42,481 |
Operations support services |  | 586,757 |  |  | 367,580 |
|  | $ | 719,067 |  |  | $ | 410,061 |
By commercial terms |  |  |  |
Time-and-materials |  | $ | 343,156 |  |  | $ | 151,796 |
Unit-price |  | 375,911 |  |  | 253,277 |
Cost-plus |  | — |  |  | 4,988 |
|  | $ | 719,067 |  |  | $ | 410,061 |
Revenue recognition method |  |  |  |
Cost-to-cost percent complete |  | $ | 252,054 |  |  | $ | 186,741 |
As-invoiced |  | 467,013 |  |  | 223,320 |
|  | $ | 719,067 |  |  | $ | 410,061 |
Schedule of major customers | At December 31, 2019 and December 31, 2018, the following customers represented 10% or more of accounts receivable and contract assets:
|  | December 31, 2019 |  |  | December 31, 2018 |
Customer 1 |  | 36 | % |  | 16 | %
Customer 2 |  | 25 | % |  | 8 | %
Customer 3 |  | 13 | % |  | 33 | %
Customer 4 |  | 12 | % |  | 12 | %
The following customers accounted for 10% or more of total revenues:
Year ended December 31, |  | 2019 |  |  | 2018 |
Customer A |  | 33 | % |  | 43 | %
Customer B |  | 27 | % |  | 2 | %
Customer C |  | 22 | % |  | 23 | %
Customer D |  | 13 | % |  | 21 | %
Contract balances |
|  | December 31, 2019 |  |  | December 31, 2018 |
Contract assets |  | $ | 19,193 |  |  | $ | 10,673 |
Contract liabilities |  | 23 |  |  | 4,032 |
The following table provides information about significant changes in the contract assets:
Year ended December 31, |  | 2019 |  |  | 2018 |
Balance, beginning of period |  | $ | 10,673 |  |  | $ | 21,572 |
Transferred to receivables from contract assets recognized at the beginning of the period |  | (10,276 | ) |  | (14,701 | )
Increases as a result of changes to the estimate of the stage of completion, excluding amounts transferred in the period |  | 14,892 |  |  | 2,043 |
Increases as a result of work completed, but not yet an unconditional right to consideration |  | 5,736 |  |  | 409 |
Increases as a result of Nuna acquisition |  | — |  |  | 1,350 |
Decreases due to effect of change in presentation of NL Partnership |  | (1,832 | ) |  | — |
Balance, end of period |  | $ | 19,193 |  |  | $ | 10,673 |
The following table provides information about significant changes in the contract liabilities:
Year ended December 31, |  | 2019 |  |  | 2018 |
Balance, beginning of period |  | $ | 4,032 |  |  | $ | 824 |
Revenue recognized that was included in the contract liability balance at the beginning of the period |  | (4,031 | ) |  | (84 | )
Increases due to cash received, excluding amounts recognized as revenue during the period |  | 174 |  |  | 1,379 |
Increases as a result of Nuna acquisition |  | — |  |  | 1,913 |
Decreases due to effect of change in presentation of NL Partnership |  | (152 | ) |  | — |
Balance, end of period |  | $ | 23 |  |  | $ | 4,032 |
The following table provides information about revenue recognized from performance obligations that were satisfied (or partially satisfied) in previous periods:
Year ended December 31, |  | 2019 |  |  | 2018 |
Revenue recognized |  | $ | 1,857 |  |  | $ | 2,516 |
Schedule remaining performance obligations |
For the year ended December 31, |
2020 | $ | 58,966 |
2021 | 4,729 |
2022 | 4,729 |
2023 | 4,729 |
2024 | 2,225 |
| $ | 75,378 |
Summary of contract costs | The following table summarizes contract costs included within other assets on the consolidated balance sheets.
|  | December 31, 2019 |  |  | December 31, 2018 |
Reimbursable bid costs |  | $ | — |  |  | $ | 670 |
Fulfillment costs |  | 1,016 |  |  | 1,638 |
|  | $ | 1,016 |  |  | $ | 2,308 |

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