Satellite Network and Other Equipment - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense		$ 4,616	$ 3,800		$ 3,406
Impairment charges-satellite network	9,793		9,793	[1]
Insurance claim arising from the loss of the prototype satellite	10,000
Insurance recovery-satellite network			10,000	[1]
Accumulated depreciation and amortization	20,371	24,628	20,371
Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Company capitalized costs attributable to the design and development of internal-use software		1,754	857
Amortization of internal-use software		611	388		347
Satellite Network [Member]
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ 14,550		$ 14,550

[1] Stock-based compensation included in costs and expenses: Costs of services $ 303 $ 286 $ 131 Costs of product sales 114 19 8 Selling, general and administrative 2,316 1,346 1,742 Product development 240 150 33 $ 2,973 $ 1,801 $ 1,914