Intangible Assets - Gross carrying amount and accumulated amortization acquired identifiable intangible assets(Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,900,000	$ 16,900,000
Accumulated Amortization	(12,864,382)	(10,557,893)
Effect of Foreign Currency Translation	1,234,953	1,132,529
Total	5,270,571	7,474,636
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	(12,156,049)	(9,974,597)
Effect of Foreign Currency Translation	1,234,953	1,132,529
Total	4,978,904	7,057,932
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	(708,333)	(583,296)
Effect of Foreign Currency Translation
Total	$ 291,667	$ 416,704