N OTE 17: C OMMITMENTS AND C ONTINGENCIES Purchase Commitments As of December 31, 2011, the Company had $45.2 million in purchase commitments, which are generally non-cancellable. Lease Commitments As of December 31, 2011, the Company had the following commitments under operating leases for property and equipment for each of the next five years: Year Amount 2012 $ 2,006,155 2013 650,755 2014 466,558 2015 98,152 2016 38,174 Thereafter   $ 3,259,794 During the years ended December 31, 2011, 2010 and 2009, the Company incurred rent expense of $2.6 million, $1.4 million and $1.5 million, respectively. Agreements with Contract Manufacturers The Company currently depends on a small number of contract manufacturers to manufacture its products. If any of these contract manufacturers were to terminate their agreements with the Company or fail to provide the required capacity and quality on a timely basis, the Company may be unable to manufacture and ship products until replacement contract manufacturing services could be obtained. Other Contingencies In the ordinary course of business, the Company and its subsidiaries are routinely defendants in or parties to pending and threatened legal actions and proceedings. In accordance with applicable accounting guidance, the Company establishes an accrued liability for litigation and regulatory matters when those matters present loss contingencies that are both probable and estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. When a loss contingency is not both probable and estimable, the Company does not establish an accrued liability. As a litigation or regulatory matter develops, the Company, in conjunction with counsel handling the matter, evaluates on an ongoing basis whether such matter presents a loss contingency that is probable and estimable. If, at the time of evaluation, the loss contingency related to a litigation or regulatory matter is not both probable and estimable, the matter will continue to be monitored for further develop