Accrued Liabilities - Components of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Accrued compensation and benefits	$ 3,438	$ 3,092
Warranty	2,199	2,762
Corporate income tax payable	81	843
Contingent earn-out amounts	24	320
AIS deployment and license agreement	192	216
Accrued satellite network and other equipment	212	1,559
Other accrued expenses	3,681	2,479
Total accrued liabilities	$ 9,827	$ 11,271

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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