Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 1,192	$ 2,121
Accrued network costs	867	917
Accrued taxes	3,193	3,465
Accrued outside services	1,184	1,171
Accrued other	1,368	1,573
Total accounts payable and accrued liabilities	7,804	$ 9,247
Decrease in accounts payable	$ 900