This excerpt taken from the NANO 10-K filed Mar 27, 2009.
Amortization of intangible assets.
Amortization of intangible assets for 2008 decreased $2.3 million from the comparable period in 2007 as impairment charges were recorded in the second and third quarters of 2008 to reflect certain brand names, customer relationships and developed technology at their fair value in accordance with SFAS No. 144 Accounting for the Impairment or Disposal of Long-lived Assets. Amortization associated with these intangible assets ceased in the second and third quarter of 2008 as we wrote off values to the asset impairment account.
Amortization of intangible assets for 2007 increased $0.4 million from the comparable period in 2006 due primarily to incurring amortization charges for the full year in 2007 as compared to incurring amortization for only a part of the year in 2006, as the Soluris acquisition closed in March 2006 and the Accent acquisition closed in July 2006.