	Balance at Beginning of Period	Charged to Costs and Expenses	Write-Offs	Balance at End of Period
Year ended December 31, 2006:	$ 38	$ 6	$ (4)	$ 40
Year ended December 31, 2007:	40	10	(1)	49

Balance at Beginning of Period

Charged to Costs and Expenses

Write-Offs

Balance at End of Period

Year ended December 31, 2006:

$ 38

$ 6

$ (4)

$ 40

Year ended December 31, 2007:

40

10

(1)

49