OTHER BALANCE SHEET DETAILS

As of the dates indicated, other long-term assets are comprised of the following (in thousands):



	October 31, 2013		July 31, 2014
Maintenance spares inventory, net	$	61,305	$	56,202
Deferred debt issuance costs, net	15,677		16,360
Embedded redemption feature	2,740		—
Restricted cash	2,053		46
Other	4,605		5,513
	$	86,380	$	78,121

Deferred debt issuance costs are amortized using the straight-line method, which approximates the effect of the effective interest rate method, through the maturity of the related debt. Amortization of debt issuance costs related to our convertible notes payable, term loan (described in Note 13 below) and the Credit Facility (described in Note 14 below), which is included in interest expense, was $4.2 million and $3.6 million during the first nine months of fiscal 2013 and fiscal 2014, respectively.

As of the dates indicated, accrued liabilities are comprised of the following (in thousands):



	October 31, 2013		July 31, 2014
Warranty	$	56,303	$	57,442
Compensation, payroll related tax and benefits	98,770		77,272
Vacation	32,118		33,837
Current restructuring liabilities	674		653
Interest payable	6,186		8,679
Other	77,605		89,963
	$	271,656	$	267,846

The following table summarizes the activity in Ciena’s accrued warranty for the fiscal periods indicated (in thousands):



						Balance at
Nine months ended	Beginning					end of
July 31,	Balance		Provisions	Settlements		period
2013	$	55,132	15,148	(16,904	)	$	53,376
2014	$	56,303	18,720	(17,581	)	$	57,442

As of the dates indicated, deferred revenue is comprised of the following (in thousands):



	October 31, 2013			July 31, 2014
Products	$	36,671		$	57,590
Services	75,499			82,078
	112,170			139,668
Less current portion	(88,550		)	(114,590		)
Long-term deferred revenue	$	23,620		$	25,078