Consolidated Financial Statement Components - Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Supplemental Balance Sheet Information [Abstract]
Accrued outside services	$ 929	$ 975
Accrued network costs	686	773
Accrued accounting and legal	477	467
Deferred rent and other	263	433
Asset retirement obligations	205	85
Total other current liabilities	$ 2,560	$ 2,733