Other assets as of July 31, 2019 and October 31, 2018 consisted of the following:

	July 31,		October 31,
	2019		2018
Long-term stack residual value ⁽¹⁾	$	987	$	1,206
Long-term unbilled receivables ⁽²⁾		4,159		9,385
Other⁽³⁾		4,873		2,914
Other assets	$	10,019	$	13,505

(1)

Relates to estimated residual value for module exchanges performed under the Company’s service agreements where the useful life extends beyond the contractual term of the service agreement and the Company obtains title for the module from the customer upon expiration or non-renewal of the service agreement. If the Company does not obtain rights to title from the customer, the full cost of the module is expensed at the time of the module exchange.

(2)	Represents unbilled receivables that relate to revenue recognized on customer contracts that will be billed in future periods in excess of twelve months from the balance sheet date.

(3)

The Company entered into an agreement with one of its customers on June 29, 2016 that includes a fee for the purchase of the power plants at the end of the term of the agreement. The fee is payable in installments over the term of the agreement and the total paid as of July 31, 2019 and October 31, 2018 was $2.3 million and $2.0 million, respectively. Also included within “Other” are long-term security deposits and as of July 31, 2019, prepaid withholding taxes on deferred revenue.