The following tables reflect the components of significant balance sheet accounts as of March 28, 2015 and September 27, 2014:



	As of
(in thousands)	March 28, 2015			September 27, 2014
Short term investments, available-for-sale:
Deposits maturing within one year (1)	$	1,629		$	9,105

Inventories, net:
Raw materials and supplies	$	28,248		$	22,184
Work in process	25,037			18,783
Finished goods	43,828			22,590
	97,113			63,557
Inventory reserves	(20,584		)	(13,863		)
	$	76,529		$	49,694
Property, plant and equipment, net:
Buildings and building improvements	$	33,427		$	31,159
Leasehold improvements	19,519			13,962
Data processing equipment and software	28,562			27,538
Machinery, equipment, furniture and fixtures	50,820			45,442
	132,328			118,101
Accumulated depreciation	(80,176		)	(65,346		)
	$	52,152		$	52,755
Accrued expenses and other current liabilities:
Wages and benefits	$	19,993		$	21,498
Accrued customer obligations (2)	8,495			8,999
Commissions and professional fees	3,241			1,961
Deferred rent	2,433			2,161
Severance	376			1,067
Other	8,756			8,045
	$	43,294		$	43,731

(1)

All short-term investments were classified as available-for-sale and were measured at fair value based on level one measurement, or quoted market prices, as defined by ASC 820. As of March 28, 2015 and September 27, 2014, fair value approximated the cost basis for short-term investments. The Company did not recognize any realized gains or losses on the sale of investments during the three and six months ended March 28, 2015 and March 29, 2014.


(2)	Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.