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Warrants And Derivative Liabilities (Narrative) (Details) (USD $)	12 Months Ended				0 Months Ended		1 Months Ended			0 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Convertible Bond [Member]	Mar. 31, 2013 Capital Ventures International [Member]	Mar. 31, 2013 Hercules Technology Growth Capital [Member]	Apr. 04, 2012 Senior Convertible Note [Member] Capital Ventures International [Member]	Apr. 04, 2010 Senior Convertible Note [Member] Capital Ventures International [Member]	Dec. 31, 2012 New Unsecured Senior Convertible Note [Member] Capital Ventures International [Member]	Dec. 31, 2012 New Unsecured Senior Convertible Note [Member] Capital Ventures International [Member] Maximum [Member]	Dec. 31, 2012 New Unsecured Senior Convertible Note [Member] Capital Ventures International [Member] Minimum [Member]	Jun. 05, 2012 Senior Secured Term Loan [Member] Hercules Technology Growth Capital [Member]
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock					3,094,060					139,276
Warrant exercise, waiting period	6 months
Warrant exercise period	5 years
Exercise price					$ 5.45					$ 3.59
Beneficial ownership limitation percentage								9.99%	4.99%
Required notification period	61 days
Gain (loss) in change of fair value of derivative instruments and warrants	$ 7,556,000	$ 3,800,000	$ 3,600,000	$ 200,000
Conversion price						$ 4.85		$ 4.85	$ 3.19
Increase in derivative liability							$ 500,000
Convertible debt instrument redemption waiting period	1 year
Convertible debt instrument contractual term	30 months

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

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