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Debt (Details) (USD $) | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended | 1 Months Ended |  | 0 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011 | Oct. 04, 2012 | Jun. 30, 2012 | Apr. 04, 2012 Senior Convertible Note [Member] | Mar. 31, 2013 Senior Convertible Note [Member] | Apr. 30, 2012 New Unsecured Senior Convertible Note [Member] | Jun. 05, 2012 Senior Secured Term Loan [Member] | Apr. 04, 2012 Capital Ventures International [Member] Senior Convertible Note [Member] | Apr. 04, 2010 Capital Ventures International [Member] Senior Convertible Note [Member] | Dec. 31, 2012 Capital Ventures International [Member] Senior Convertible Note [Member] | Dec. 31, 2012 Capital Ventures International [Member] New Unsecured Senior Convertible Note [Member] | Dec. 03, 2012 Capital Ventures International [Member] New Unsecured Senior Convertible Note [Member] | Jun. 05, 2012 Hercules Technology Growth Capital [Member] Senior Secured Term Loan [Member] | Mar. 31, 2013 Hercules Technology Growth Capital [Member] Senior Secured Term Loan [Member] | Dec. 31, 2012 Minimum [Member] Capital Ventures International [Member] New Unsecured Senior Convertible Note [Member] | Jun. 05, 2012 Minimum [Member] Hercules Technology Growth Capital [Member] Senior Secured Term Loan [Member] | Dec. 31, 2012 Maximum [Member] Capital Ventures International [Member] New Unsecured Senior Convertible Note [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private placement |  |  |  |  | $ 35,000,000 | $ 25,000,000 |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  | 7.00% |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Net proceeds after fees and expenses of purchase agreement |  |  |  |  |  |  |  |  |  | 23,200,000 |  |  |  |  |  |  |  |  |
Conversion price |  |  |  |  |  |  |  |  |  |  | $ 4.85 |  |  |  |  |  | $ 3.19 |  | $ 4.85
Premium over closing price, percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Period before first installment payment |  |  |  |  |  |  |  |  |  | 4 months |  |  |  |  |  |  |  |  |
Shares registered for resale |  |  |  |  |  |  |  |  |  | 10,262,311 |  |  |  |  |  |  |  |  |
Derivative liability of note | 4,162,000 |  |  |  |  |  |  |  |  | 3,800,000 |  |  | 1,500,000 |  |  |  |  |  |
Number of shares received from warrants received to purchase common stock |  |  |  |  |  |  |  |  |  | 3,094,060 |  |  |  |  | 139,276 |  |  |  |
Strike price per share |  |  |  |  |  |  |  |  |  | $ 5.45 |  |  |  |  | $ 3.59 |  |  |  |
Fair value of warrants at issuance |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  | 400,000 |  |  |  |
Legal and origination costs |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  | 300,000 |  |  |
Amendment covenant description |  |  |  |  |  |  |  |  |  |  |  |  | Allow the Company to convert, subject to the satisfaction of certain conditions set forth in the Exchanged Note, (a) at least $2.5 million of the approximately $5.3 million installment amount payable with respect to the January 2013 installment date (including approximately $4.2 million of deferred installment amounts from the period September 4, 2012 to December 3, 2012) into shares of the Company's common stock (on December 21, 2012 the Company converted $3.8 million in deferred installment amount principal and interest and issued 1,715,443 shares of common stock), and (b) the balance of the January 2013 installment amount in equal amounts on each of the February and March 2013 installment dates; Reduce the price failure equity condition with respect to a particular date of determination from $2.50 to $1.00;Reduce the aggregate daily dollar trading volume equity condition required for at least 25 of the 30 consecutive trading days immediately preceding a date of determination from $1,500,000 to $850,000 per trading day. In addition, if the aggregate daily dollar trading volume is between $50,000 and $850,000, the Company may still convert into common stock a portion of an installment amount payable with respect to an installment date equal to the quotient of (x) the aggregate daily dollar trading volume, divided by (y) $850,000;Increase CVI's beneficial ownership limitation under the Exchanged Note from 4.99% to 9.99%; andReduce the conversion price, from $4.85 per share of the Company's common stock to $3.19 per share of the Company's common stock, subject to certain price-based and other anti-dilution adjustments. |  |  |  |  |  |
Portion of installment payment to be converted |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |
Installment amount of note payable |  |  |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  |  |  |  |
Deferred installment payments of note payable |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200,000 |  |  |  |  |
Convertible amount of installment payment | 18,896,000 | 720,000 | 842,000 |  |  |  |  |  |  |  |  |  | 3,800,000 |  |  |  |  |  |
Number of shares issued for converted payment |  |  |  |  |  |  |  |  |  |  |  |  | 1,715,443 |  |  |  |  |  |
Price failure equity condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  | $ 2.50
Beneficial ownership limitation percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.99% |  | 9.99%
Increase in derivative liability |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |
Total debt discount being amortized into interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 13,100,000 |  |  |  |  |  |
Non-cash interest expense amortization of debt discount | 12,400,000 |  |  |  |  |  | 8,200,000 |  |  |  |  |  |  |  |  | 600,000 |  |  |
Percentage of stock discount | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash interest expense issuing stock at discount | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to issue additional principal amount |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowed amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |
Proceeds from the issuance of debt, net of expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,700,000 |  |  |  |
Interest rate on loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |
Prime rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.75% |
End of term fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |
Interest expense | 14,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |
Covenant, unrestricted cash balance requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |

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- Definition The cost of borrowed funds accounted for as interest that was charged against earnings during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 9 -Chapter V -Subsection II -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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