Consolidated Financial Statement Components - Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Supplemental Balance Sheet Information [Abstract]
Accrued outside services	$ 975	$ 1,455
Accrued network costs	773	917
Accrued accounting and legal	467	458
Accrued recognition awards	299	370
Deferred rent	134	165
Asset retirement obligations	85	296
Total other current liabilities	$ 2,733	$ 3,661