(18)	Commitments

The Company has operating leases expiring on various dates through the year 2019. The leases are primarily for the rental of office space, office and laboratory equipment and vehicles. At December 31, 2011, future minimum commitments under non-cancelable operating lease arrangements were as follows:

Year ended December 31:
2012	$	815
2013		715
2014		650
2015		614
2016		489
2017 and thereafter		954
Total commitments	$	4,237

Total operating lease expense was $644, $2,027 and $1,978 for the years ended December 31, 2011, 2010 and 2009, respectively.

The Company is party to several unconditional purchase obligations resulting from contracts that contain legally binding provisions with respect to quantities, pricing and timing of purchases. The Company's purchase obligations mainly include commitments to purchase utilities. At December 31, 2011, future commitments under these obligations were as follows:

Year ended December 31:
2012	$	1,487
2013		540
2014		32
2015		-
2016		-
Total commitments	$	2,059