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Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Effects of the revisions on Consolidated Balance Sheet
Accounts receivable	$ 22,482us-gaap_AccountsReceivableNetCurrent	$ 22,944us-gaap_AccountsReceivableNetCurrent
Other current assets	5,962us-gaap_OtherAssetsCurrent	3,166us-gaap_OtherAssetsCurrent
Accounts payable	14,038us-gaap_AccountsPayableCurrent	13,055us-gaap_AccountsPayableCurrent
Accrued expenses	22,158us-gaap_AccruedLiabilitiesCurrent	20,315us-gaap_AccruedLiabilitiesCurrent
Customer advances and deferred revenue	19,467us-gaap_DeferredRevenueCurrent	10,002us-gaap_DeferredRevenueCurrent
Accumulated deficit	(130,136)	(137,249)
Accumulated other comprehensive loss	(9,340)	(13,842)	(13,130)	(7,484)
Adjustments
Effects of the revisions on Consolidated Balance Sheet
Accounts receivable	1	261
Other current assets	(2)	(65)
Accrued expenses	(4,133)
Customer advances and deferred revenue	6,820
Accumulated deficit	(2,670)	197
Accumulated other comprehensive loss	(17)	(1)
Impact of correcting error related to the M240 Program, previously recorded immaterial out-of-period adjustments and the reclassification of business development expenses \| Adjustments
Effects of the revisions on Consolidated Balance Sheet
Accounts receivable	1	261
Other current assets	(2)	(65)
Accrued expenses	(4,133)
Customer advances and deferred revenue	6,820
Accumulated deficit	(2,670)	197
Accumulated other comprehensive loss	(17)	(1)
Impact of a contract modification related to the M240 machine gun program \| Adjustments
Effects of the revisions on Consolidated Balance Sheet
Customer advances and deferred revenue	(6,820)
Impact of a contract obligation expense related to the M240 machine gun program \| Adjustments
Effects of the revisions on Consolidated Balance Sheet
Accrued expenses	$ (4,132)