Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amounts Reclassified Out Of Accumulated Other Comprehensive Income Loss [Abstract]
Net income (loss)	$ (1,359,941)	$ 575,677	$ (7,166,596)	$ 651,917
Other comprehensive income (loss):
Net unrealized gains (losses) on marketable securities, net of tax	(49,029)	(4,295)	(68,535)	6,438
Net translation gains (losses)	317,802	(905,512)	(1,196,356)	130,201
Total other comprehensive income (loss)	268,773	(909,807)	(1,264,891)	136,639
Comprehensive income (loss)	$ (1,091,168)	$ (334,130)	$ (8,431,487)	$ 788,556