Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current deferred tax assets:
Deferred revenues	$ 989	$ 856
Allowance for doubtful accounts	887	879
Inventory	235	89
Deferred compensation	448	108
Bonus accruals	455	375
Vacation accrual	160	163
Deferred rent	15	52
Warranty accrual	668	869
Installment sale note receivable	9	9
Other		57
Total current deferred tax assets	3,866	3,457
Non-current deferred tax assets:
Intangibles	441	274
Acquisition related costs	653	515
Deferred revenues	958	695
Deferred compensation	2,751	2,657
Deferred rent	163	39
Accrued expenses	321	317
Installment sale note receivable	576	577
Foreign tax credit	1,646	1,646
Alternative minimum tax credit	340	308
Tax loss carryforwards and credits	1,397	4,913
Total non-current current deferred tax assets	9,246	11,941
Total deferred tax assets	13,112	15,398
Current deferred tax liabilities:
Accrued expenses		(19)
Unremitted earnings of Japan Subsidiary		(2,455)
Total current deferred tax liabilities		(2,474)
Non-current deferred tax liabilities:
Satellite network and other property	(1,396)	(158)
Goodwill	(1,043)	(397)
Total non-current current deferred tax liabilities	(2,439)	(555)
Total deferred tax liabilities	(2,439)	(3,029)
Net deferred tax assets before valuation allowance	10,673	12,369
Less valuation allowance	(11,235)	(12,204)
Net deferred tax asset (liabilities)	(562)	165
Deferred tax assets, current	623	164
Deferred tax assets, non-current	1,254	398
Deferred tax liabilities, non-current	(2,439)	(397)
Net deferred tax assets (liabilities)	$ (562)	$ 165