Segment Data (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010
Summary of operational information relative to the company's reportable segments
Product sales	$ 32,115,957	$ 28,772,956	$ 28,222,443	$ 25,641,392	$ 21,329,792	$ 24,383,110	$ 21,198,055	$ 23,116,949	$ 114,752,748	$ 90,027,906	$ 86,930,019
Service revenue									627,425	351,696	79,345
Net sales									114,752,748	90,027,906	86,930,019
Cost of products sold									47,038,173	41,752,520	41,563,144
Cost of services delivered									3,914,887	4,846,952	3,148,023
Excess inventory charges										3,700,000
Gross margin	19,167,932	16,803,011	16,502,373	15,241,259	6,976,273	13,103,609	12,240,492	12,208,863	67,714,575	44,529,237	45,366,875
Sales, general and administrative									39,086,190	38,000,455	39,021,564
Research and development									8,139,359	9,989,219	11,411,889
Litigation judgment						3,300,000			(2,200,000)	3,301,243
Loss on impairment										1,353,857
Loss on write down / disposal of property and equipment, net									160,506	2,800,396	73,061
Income (loss) from operations									22,528,520	(10,915,933)	(5,139,639)
Purchases of property and equipment									1,333,986	1,854,083	4,023,691
Purchases of intangible assets									428,983	413,466	478,983
Depreciation and amortization									6,519,250	8,096,543	7,286,915
Segment Data (Textual) [Abstract]
Number of reportable segment of company									2
CEW [Member]
Summary of operational information relative to the company's reportable segments
Product sales									109,054,723	86,675,067	82,390,462
Net sales									109,054,723	86,675,067	82,390,462
Cost of products sold									39,350,134	34,212,839	35,018,904
Excess inventory charges										1,749,099
Gross margin									69,704,589	50,713,129	47,371,558
Sales, general and administrative									35,575,818	34,793,889	36,644,150
Research and development									3,938,166	5,444,874	5,535,815
Litigation judgment									(2,200,000)	3,301,243
Loss on impairment										1,353,857
Loss on write down / disposal of property and equipment, net									160,506	643,560	73,061
Income (loss) from operations									32,230,099	5,175,706	5,118,532
Purchases of property and equipment									922,329	1,501,121	3,000,705
Purchases of intangible assets									428,983	413,466	478,983
Depreciation and amortization									4,327,427	5,409,026	5,704,286
Video [Member]
Summary of operational information relative to the company's reportable segments
Product sales									5,070,600	3,001,143	4,460,212
Service revenue									627,425	351,696	79,345
Net sales									5,698,025	3,352,839	4,539,557
Cost of products sold									3,773,152	2,692,729	3,396,217
Cost of services delivered									3,914,887	4,846,952	3,148,023
Excess inventory charges										1,997,050
Gross margin									(1,990,014)	(6,183,892)	(2,004,683)
Sales, general and administrative									3,510,372	3,206,566	2,377,414
Research and development									4,201,193	4,544,345	5,876,074
Loss on write down / disposal of property and equipment, net										2,156,836
Income (loss) from operations									(9,701,579)	(16,091,639)	(10,258,171)
Purchases of property and equipment									411,657	352,962	1,022,986
Depreciation and amortization									$ 2,191,823	$ 2,687,517	$ 1,582,629