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Warrants And Derivative Liabilities (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended |  | 3 Months Ended
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Dec. 31, 2012 | Dec. 31, 2012 | Apr. 04, 2012 Securities Purchase Agreement [Member] | Dec. 31, 2012 Securities Purchase Agreement [Member] | Dec. 31, 2012 Securities Purchase Agreement [Member] | Dec. 31, 2012 Convertible Bond [Member] | Dec. 31, 2012 Convertible Bond [Member] | Jun. 05, 2012 Loan And Security Agreement [Member] | Dec. 31, 2012 Capital Ventures International [Member] | Dec. 31, 2012 Hercules Technology Growth Capital [Member] | Dec. 31, 2012 Hercules Technology Growth Capital [Member] | Dec. 31, 2012 Unsecured Senior Convertible Note [Member] Capital Ventures International [Member] | Apr. 03, 2012 Unsecured Senior Convertible Note [Member] Capital Ventures International [Member] | Dec. 31, 2012 New Unsecured Senior Convertible Note [Member] Capital Ventures International [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares warranted to purchase |  |  | 3,100,000 |  |  |  |  | 139,276 |  |  |  |  |  |
Warrant exercise, waiting period |  |  |  | 6 months | 6 months |  |  |  |  |  |  |  |  |
Warrant exercise period |  |  |  | 5 years | 5 years |  |  |  |  |  |  |  |  |
Exercise price |  |  | $ 5.45 |  |  |  |  | $ 3.59 |  |  |  |  |  |
Beneficial ownership limitation percentage |  |  |  |  |  |  |  |  |  |  |  | 4.99% |  | 9.99%
Required notification period |  |  |  | 61 days | 61 days |  |  |  |  |  |  |  |  |
Gain (loss) in change of fair value of derivative instruments and warrants | $ 5,217,000 | $ 6,114,000 |  | $ 2,700,000 | $ 2,600,000 | $ 2,300,000 | $ 3,300,000 |  |  | $ 200,000 | $ 200,000 |  |  |
Conversion price |  |  |  |  |  |  |  |  |  |  |  | $ 4.85 | $ 4.85 | $ 3.19
Debt discount |  |  |  |  |  |  |  |  | $ 13,100,000 | $ 1,200,000 | $ 1,200,000 |  |  | $ 500,000
Convertible debt instrument redemption waiting period | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt instrument contractual term | 30 months | 30 months |  |  |  |  |  |  |  |  |  |  |  |

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