Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended			1 Months Ended		12 Months Ended					12 Months Ended	0 Months Ended	1 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2013 Lawsuits	Dec. 31, 2013 Cases Lawsuits	Sep. 30, 2011 Cases	Dec. 31, 2013 Lawsuits	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Slade [Member]	Jul. 31, 2011 Slade [Member]	Dec. 31, 2012 Slade [Member]	Dec. 31, 2011 Slade [Member]	May 04, 2012 Slade [Member]	Apr. 20, 2012 Slade [Member]	Dec. 31, 2013 Ramsey [Member]	Dec. 31, 2013 2008 [Member]	Jan. 10, 2014 Subsequent Event [Member]	Nov. 30, 2013 Products Liability Litigation [Member] Lawsuits	Dec. 31, 2013 Karbon Arms LLC [Member]	Dec. 31, 2013 AA And Saba Consultants [Member]	Feb. 28, 2014 AA And Saba Consultants [Member] Subsequent Event [Member]	Dec. 31, 2013 Office Equipment [Member]
Loss Contingencies [Line Items]
Rent expense under operating lease				$ 1,500,000	$ 1,400,000	$ 1,800,000
Capital lease obligation																				103,000
Original cost of leased equipment																				147,000
Associated accumulated amortization																				44,000
Interest rate																				6.20%
Open purchase order	11,900,000	11,900,000		11,900,000
Number of lawsuits against Company	16	16		16
Number of lawsuit	1	1		1
Number of active product liability cases		16	55
Product litigation settlement amount																2,300,000
Number of pre-2009, product liability law suits settled																2
Jury decision against company								10,000,000
Litigation judgment		2,600,000								3,300,000
Jury award value							4,400,000								2,400,000
Jury decision against company which adjusted to award											5,500,000	5,500,000
Benefit on reversal of accrued litigation				(1,450,000)	2,200,000	(3,301,000)			2,200,000
Benefit on reversal of accrued litigation leaving a reserve									1,100,000				0
Remaining Insurance Coverage														2,600,000
Loss contingency receivable																	0
Amount of settlement offer					800,000
Verdict against the company																			3,300,000
Loss contingency loss in period																		2,600,000
Amount payable on termination of contract	$ 800,000