Intangible Assets - Gross carrying amount and accumulated amortization acquired identifiable intangible assets(Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,900,000	$ 16,900,000
Accumulated Amortization	(13,438,112)	(12,864,382)
Effect of Foreign Currency Translation	1,172,748	1,234,953
Total	4,634,636	5,270,571
Acquired Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	8 years	8 years
Gross Carrying Amount	15,900,000	15,900,000
Accumulated Amortization	(12,698,529)	(12,156,049)
Effect of Foreign Currency Translation	1,172,748	1,234,953
Total	4,374,219	4,978,904
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	8 years	8 years
Gross Carrying Amount	1,000,000	1,000,000
Accumulated Amortization	(739,583)	(708,333)
Effect of Foreign Currency Translation
Total	$ 260,417	$ 291,667