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
	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