Consolidated Financial Statement Components - Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Supplemental Balance Sheet Information [Abstract]
Accrued outside services	$ 1,057	$ 975
Accrued accounting and legal	678	467
Accrued network costs	644	773
Deferred rent and other	255	433
Asset retirement obligations	186	85
Total other current liabilities	$ 2,820	$ 2,733