Balance Sheet Components (Accured Liab) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Balance Sheet Components
Accrued expenses	$ 19,341	$ 17,870
Accrued rent	875	450
Deferred lease obligation	28	42
Sales tax payable	471	346
Total other accrued liabilities	$ 20,715	$ 18,708