Table:
|  | 2019 | 2018 |
| --- | --- | --- |
| Advances | 500 | - |
| Board compensation | 413 | 413 |
| Other accrued expenses | 168 | 150 |
|  | $1,081 | $563 |
Paragraphs:
7. ACCRUED LIABILITIES
Other accrued expenses consisted of the following at December 31, 2019 and 2018 (in thousands):
Advances are amounts received from litigation counsel as advanced reimbursement of out-of-pocket expenses expected to be incurred by us. Board compensation of $0.4 million at December 31, 2019 and 2018 represents accrued and unpaid board and committee fees from prior periods. In the first quarter of 2020, current and prior board members agreed to waive unpaid cash fees in exchange for share-based compensation awards with an aggregate grant-date fair value of approximately $0.1 million (see Note 18).
Question:
How many categories of accrued liabilities are there?
Answer: Because Advances##Board Compensation##Other accrued expenses, the answer is: 3.