Balance Sheet Components (Accured liab) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Balance Sheet Components
Accrued expenses	$ 16,374	$ 8,560
Accrued rent	352	551
Deferred lease obligation	57	99
Accrued interest	455	764
Sales tax payable	250	367
Total other accrued liabilities	$ 17,488	$ 10,341