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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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