Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Balance Sheet Components [Abstract]
Prepaid expenses and deposits for inventory	$ 2,794,000		$ 1,991,000
Escrow receivable	3,000,000		0
Other current assets	1,219,000	[1]	386,000	[1]
Prepaid expenses and other current assets	7,013,000		2,377,000
Transition recivables, Current	700,000
Vendor rebates and other receivables	$ 500,000

[1] Other current assets in 2012 include $0.7 million receivable from the Buyers for performance of transition services and $0.5 million in vendor rebate and other receivables.