Intangible Assets - Gross carrying amount and accumulated amortization acquired identifiable intangible assets(Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,900,000	$ 16,900,000
Accumulated Amortization	(14,006,403)	(12,864,382)
Effect of Foreign Currency Translation	1,089,374	1,234,953
Total	3,982,971	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	(13,235,570)	(12,156,049)
Effect of Foreign Currency Translation	1,089,374	1,234,953
Total	3,753,804	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	(770,833)	(708,333)
Effect of Foreign Currency Translation
Total	$ 229,167	$ 291,667