Balance Sheet Components (Accured liab) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Balance Sheet Components
Accrued expenses	$ 17,870	$ 8,560
Accrued rent	450	551
Deferred lease obligation	42	99
Accrued interest		764
Sales tax payable	346	367
Total other accrued liabilities	$ 18,708	$ 10,341