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Financial instruments and risk management | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Financial instruments and risk management | Financial instruments and risk management a) Fair value measurements In determining the fair value of financial instruments, the Company uses a variety of methods and assumptions that are based on market conditions and risks existing on each reporting date. Standard market conventions and techniques, such as discounted cash flow analysis are used to determine the fair value of the Company’s financial instruments. All methods of fair value measurement result in a general approximation of fair value and such value may never actually be realized. The fair values of the Company’s cash, accounts receivable, contract assets, loans to affiliates and joint ventures, accounts payable, accrued liabilities and contract liabilities approximate their carrying amounts due to the nature of the instrument or the relatively short periods to maturity for the instruments. The Credit Facility has a carrying value that approximates the fair value due to the floating rate nature of the debt. The promissory notes and mortgages have carrying values that are not materially different than their fair values due to similar instruments bearing similar interest rates. Financial instruments with carrying amounts that differ from their fair values are as follows:
|  |  |  | December 31, 2020 |  | December 31, 2019
|  | Fair Value Hierarchy Level |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Convertible debentures |  | Level 1 |  | 55,000 |  |  | 52,250 |  |  | 94,031 |  |  | 112,970 |
Financing obligations |  | Level 2 |  | 51,118 |  |  | 49,938 |  |  | 15,435 |  |  | 13,647 |
b) Risk management The Company is exposed to liquidity, market and credit risks associated with its financial instruments. The Company will from time to time use various financial instruments to reduce market risk exposures from changes in foreign currency exchange rates and interest rates. Management performs a risk assessment on a continual basis to help ensure that all significant risks related to the Company and its operations have been reviewed and assessed to reflect changes in market conditions and the Company’s operating activities. In response to the economic slowdown caused by COVID-19, the Government of Canada introduced the Canada Emergency Wage Subsidy, an employer assistance program. For the year ended December 31, 2020, the Company recognized $28,232 of salary and wage subsidies presented as reductions of project costs, equipment costs and general and administrative expenses of $16,241, $9,107 and $2,884 respectively. c) Market risk Market risk is the risk that the future revenue or operating expense related cash flows, the fair value or future cash flows of a financial instrument will fluctuate because of changes in market prices such as foreign currency exchange rates and interest rates. The level of market risk to which the Company is exposed at any point in time varies depending on market conditions, expectations of future price or market rate movements and composition of the Company’s financial assets and liabilities held, non-trading physical assets and contract portfolios. To manage the exposure related to changes in market risk, the Company has used various risk management techniques. Such instruments may be used to establish a fixed price for a commodity, an interest bearing obligation or a cash flow denominated in a foreign currency. The sensitivities provided below are hypothetical and should not be considered to be predictive of future performance or indicative of earnings on these contracts. i) Foreign exchange risk The Company regularly transacts in foreign currencies when purchasing equipment and spare parts as well as certain general and administrative goods and services. These exposures are generally of a short-term nature and the impact of changes in exchange rates has not been significant in the past. The Company may fix its exposure in either the Canadian Dollar or the US Dollar for these short term transactions, if material. ii) Interest rate risk The Company is exposed to interest rate risk from the possibility that changes in interest rates will affect future cash flows or the fair values of its financial instruments. Interest expense on borrowings with floating interest rates, including the Company’s Credit Facility, varies as market interest rates change. At December 31, 2020, the Company held $220.0 million of floating rate debt pertaining to its Credit Facility (December 31, 2019 – $190.0 million). As at December 31, 2020, holding all other variables constant, a 100 basis point change to interest rates on the outstanding floating rate debt will result in $2.2 million corresponding change in annual interest expense. The fair value of financial instruments with fixed interest rates fluctuate with changes in market interest rates. However, these fluctuations do not affect earnings, as the Company’s debt is carried at amortized cost and the carrying value does not change as interest rates change. The Company manages its interest rate risk exposure by using a mix of fixed and variable rate debt. d) Credit risk Credit risk is the risk that financial loss to the Company may be incurred if a customer or counterparty to a financial instrument fails to meet its contractual obligations. The Company manages the credit risk associated with its cash by holding its funds with what it believes to be reputable financial institutions. The Company is also exposed to credit risk through its accounts receivable and contract assets. Credit risk for trade and other accounts receivables and contract assets are managed through established credit monitoring activities. The following customers accounted for 10% or more of total revenues:
Year ended December 31, |  | 2020 |  | 2019
Customer A |  | 45 | % |  | 33 | %
Customer B |  | 30 | % |  | 22 | %
Customer C |  | 11 | % |  | 13 | %
Customer D |  | 10 | % |  | 27 | %
The concentration risk is mitigated primarily by the customers being large investment grade organizations. The credit worthiness of new customers is subject to review by management through consideration of the type of customer and the size of the contract. At December 31, 2020 and December 31, 2019, the following customers represented 10% or more of accounts receivable and contract assets:
|  | December 31, 2020 |  | December 31, 2019
Customer 1 |  | 39 | % |  | 36 | %
Customer 2 |  | 20 | % |  | 12 | %
Customer 3 |  | 16 | % |  | 13 | %
Customer 4 |  | — | % |  | 25 | %
The Company’s exposure to credit risk for accounts receivable and contract assets is as follows:
|  | December 31, 2020 |  | December 31, 2019
Trade accounts receivable |  | $ | 23,692 |  |  | $ | 38,686 |
Holdbacks |  | 64 |  |  | 7,152 |
Accrued trade receivables |  | 8,445 |  |  | 13,174 |
Contract receivables, included in accounts receivable |  | $ | 32,201 |  |  | $ | 59,012 |
Other receivables |  | 4,172 |  |  | 7,734 |
Total accounts receivable |  | $ | 36,373 |  |  | $ | 66,746 |
Contract assets |  | 7,034 |  |  | 19,193 |
Total |  | $ | 43,407 |  |  | $ | 85,939 |
Payment terms are per the negotiated customer contracts and generally range between net 15 days and net 60 days. As at December 31, 2020 and December 31, 2019, trade receivables and holdbacks are aged as follows:
|  | December 31, 2020 |  | December 31, 2019
Not past due |  | $ | 21,725 |  |  | $ | 35,409 |
Past due 1-30 days |  | 1,821 |  |  | 10,380 |
Past due 31-60 days |  | 85 |  |  | 5 |
More than 61 days |  | 125 |  |  | 44 |
Total |  | $ | 23,756 |  |  | $ | 45,838 |
As at December 31, 2020, the Company has recorded an allowance for credit losses of $nil (December 31, 2019 - $nil).

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