Satellite Network and Other Equipment - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended				9 Months Ended
	Jun. 30, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense		$ 6,331			$ 2,481	$ 19,426	$ 6,470
Non-cash impairment charge			$ 12,748			12,748
OG2 Satellite Procurement [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense		3,703			1,708	11,554	4,446
Internal-use Software [Member]
Property, Plant and Equipment [Line Items]
Company capitalized costs attributable to the design and development of internal-use software						2,617	2,084
Internal-use Software [Member] | OG2 Satellite Procurement [Member]
Property, Plant and Equipment [Line Items]
Amortization of internal-use software		$ 452			$ 259	1,236	$ 669
Satellite Network [Member]
Property, Plant and Equipment [Line Items]
Removal/decrease in satellite network and other equipment				$ 137
In-orbit OG2 Satellites One [Member]
Property, Plant and Equipment [Line Items]
Removal/decrease in satellite network and other equipment						13,788
Non-cash impairment charge	$ 12,748		$ 12,748
Accumulated depreciation on equipment						$ 1,040