4. Cash and cash equivalents:
| 2019 | 2018 | |
|---|---|---|
| Cash and cash equivalents | $ 5,122 | $ 7,100 |
| Cash and cash equivalents | $ 5,122 | $ 7,100 |
The Commission has an agreement with a Canadian chartered bank for an operating line of credit in the amount of $6,000 (2018 - $6,000) bearing interest at prime minus 0.25%. The line of credit is unsecured.
5. Accounts receivable:
| 2019 | 2018 | |
|---|---|---|
| Trade receivables | $ 6,913 | $ 6,146 |
| Unbilled revenue | 5,085 | 4,669 |
| Allowance for doubtful accounts | (92) | (95) |
| Accounts receivable | $ 11,906 | $ 10,720 |
The Commission's exposure to credit risk and impairment losses related to trade receivables is disclosed in Note 17.
6. Inventory:
Inventory consists of parts and supplies acquired for internal construction, consumption or recoverable work.
The amount of inventory consumed by the Commission and recognized as an expense during 2019 was $1,110 (2018 - $1,278).