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Revenue | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Revenue | Revenue a) 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 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 | %
c) 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 |
These amounts relate to cumulative catch-up adjustments arising from changes in estimated project costs on cost-to-cost percent complete jobs and final settlement of constrained variable consideration. d) Unpriced contract modifications The Company recognized revenue from variable consideration related to unpriced contract modifications for the year ended December 31, 2018 of $250 (December 31, 2017 - $1,168). The table below represents the classification of such uncollected consideration on the balance sheet:
|  | December 31, 2018 |  |  | December 31, 2017 |
Accounts receivable |  | $ | — |  |  | $ | 358 |
Contract assets |  | 7,526 |  |  | 7,662 |
|  | $ | 7,526 |  |  | $ | 8,020 |
e) Transaction price allocated to the remaining 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. f) 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 |
During the year ended December 31, 2018, reimbursable bid costs of $248 were capitalized (December 31, 2017 - $422). During the year ended December 31, 2018, fulfillment costs of $2,611 were capitalized (December 31, 2017 - $nil). Included in the amount capitalized during the year ended December 31, 2018 is $502 that was capitalized on January 1, 2018 upon adoption of the new revenue standard.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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