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Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Comprehensive Income [Abstract]
Net loss	$ (26,439,159)	$ (28,491,153)	$ (21,328,538)
Other comprehensive income (loss)
Foreign currency translation adjustments	57,568	151,125	40,032
Unrealized gains (losses) on marketable securities	1,356	1,339	(119,041)
Other comprehensive income (loss)	58,924	152,464	(79,009)
Comprehensive loss	$ (26,380,235)	$ (28,338,689)	$ (21,407,545)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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