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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of Financial Instruments, Measured at Fair Value on a Recurring and Non-recurring Basis | As at December 31, 2020, the carrying amount and fair value of the Company’s financial instruments were as follows:
| Level 1 $ |  | Level 2 $ |  | Level 3 $
| Carrying Amount | Fair Value |  | Carrying Amount | Fair Value |  | Carrying Amount | Fair Value
Assets: |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
U.S. federal bonds | 174,397 | 174,399 |  | — | — |  | — | —
Corporate bonds and commercial paper | 134,056 | 134,396 |  | — | — |  | — | —
Repurchase agreements | — | — |  | 290,000 | 290,001 |  | — | —
Marketable securities: |  |  |  |  |  |  |  |
U.S. term deposits | 885,000 | 887,102 |  | — | — |  | — | —
U.S. federal bonds | 1,224,052 | 1,226,657 |  | — | — |  | — | —
Canadian federal bonds | 24,988 | 24,987 |  | — | — |  | — | —
Corporate bonds and commercial paper | — | — |  | 1,550,330 | 1,552,907 |  | — | —
Derivative assets: |  |  |  |  |  |  |  |
Foreign exchange forward contracts | — | — |  | 16,340 | 16,340 |  | — | —
As at December 31, 2019, the carrying amount and fair value of the Company’s financial instruments were as follows:
| Level 1 $ |  | Level 2 $ |  | Level 3 $
| Carrying Amount | Fair Value |  | Carrying Amount | Fair Value |  | Carrying Amount | Fair Value
Assets: |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Repurchase agreements | — | — |  | 200,000 | 200,009 |  | — | —
Marketable securities: |  |  |  |  |  |  |  |
U.S. term deposits | 300,000 | 301,354 |  | — | — |  | — | —
U.S. federal bonds | 222,713 | 223,403 |  | — | — |  | — | —
Canadian federal bonds | 69,922 | 69,919 |  | — | — |  | — | —
Corporate bonds and commercial paper | — | — |  | 1,212,643 | 1,216,822 |  | — | —
Derivative assets: |  |  |  |  |  |  |  |
Foreign exchange forward contracts | — | — |  | 5,830 | 5,830 |  | — | —

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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