Segment Data (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011 Segment	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of operational information relative to the company's reportable segments
Product sales	$ 28,222,443		$ 21,198,055	$ 53,863,835	$ 44,315,004
Service revenue	126,588		83,037	238,175	155,891
Net sales	28,222,443		21,198,055	53,863,835	44,315,004
Cost of products sold	11,720,070		8,956,362	22,120,203	19,865,649
Cost of services delivered	1,199,260		1,202,420	2,194,125	2,353,982
Gross margin	16,502,373		12,241,693	31,743,632	24,449,355
Litigation judgment benefit			3,301,243	(2,200,000)	3,301,243
Income (loss) from operations	6,058,932		(5,016,545)	12,513,949	(4,906,359)
Purchases of property and equipment	302,572		803,367	602,302	659,872
Purchases of intangible assets	129,809		125,420	251,987	213,276
Depreciation and amortization	1,707,332		2,199,067	3,395,443	4,117,580
Segment Data (Textual) [Abstract]
Number of reportable segment of company		2
ECD [Member]
Summary of operational information relative to the company's reportable segments
Product sales	26,931,727		20,450,150	51,689,401	42,663,989
Service revenue
Net sales	26,931,727		20,450,150	51,689,401	42,663,989
Cost of products sold	9,783,886		7,203,441	18,395,306	16,249,223
Cost of services delivered
Gross margin	17,147,841		13,246,709	33,294,095	26,414,766
Litigation judgment benefit			3,301,243	(2,200,000)	3,301,243
Income (loss) from operations	8,557,103		(1,390,065)	17,976,508	1,537,228
Purchases of property and equipment	181,847		785,050	313,291	639,341
Purchases of intangible assets	129,809		125,420	251,987	213,276
Depreciation and amortization	1,067,237		1,548,451	2,282,454	2,981,632
Video [Member]
Summary of operational information relative to the company's reportable segments
Product sales	1,164,128		664,868	1,936,259	1,495,124
Service revenue	126,588		83,037	238,175	155,891
Net sales	1,290,716		747,905	2,174,434	1,651,015
Cost of products sold	736,924		550,501	1,530,772	1,262,444
Cost of services delivered	1,199,260		1,202,420	2,194,125	2,353,982
Gross margin	(645,468)		(1,005,016)	(1,550,463)	(1,965,411)
Litigation judgment benefit
Income (loss) from operations	(2,498,171)		(3,626,480)	(5,462,559)	(6,443,587)
Purchases of property and equipment	120,725		18,317	289,011	20,531
Purchases of intangible assets
Depreciation and amortization	$ 640,095		$ 650,616	$ 1,112,989	$ 1,135,948