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Debt (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended |  | 3 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended
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Apr. 04, 2012 | Dec. 31, 2012 | Dec. 31, 2012 | Dec. 20, 2012 | Apr. 04, 2012 Capital Ventures International [Member] | Dec. 31, 2012 Capital Ventures International [Member] | Dec. 31, 2012 Capital Ventures International [Member] | Apr. 03, 2012 Capital Ventures International [Member] Unsecured Senior Convertible Note [Member] | Apr. 04, 2012 Capital Ventures International [Member] Unsecured Senior Convertible Note [Member] | Dec. 31, 2012 Capital Ventures International [Member] Unsecured Senior Convertible Note [Member] | Oct. 04, 2012 Capital Ventures International [Member] Unsecured Senior Convertible Note [Member] | Dec. 31, 2012 Capital Ventures International [Member] New Unsecured Senior Convertible Note [Member] | Jun. 05, 2012 Hercules Technology Growth Capital [Member] | Dec. 31, 2012 Hercules Technology Growth Capital [Member] | Dec. 31, 2012 Hercules Technology Growth Capital [Member] | Jun. 05, 2012 Hercules Technology Growth Capital [Member] Senior Secured Term Loan [Member] | Dec. 31, 2012 Hercules Technology Growth Capital [Member] Senior Secured Term Loan [Member] | Dec. 31, 2012 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] | Dec. 31, 2012 Maximum [Member] Capital Ventures International [Member] New Unsecured Senior Convertible Note [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private placement |  |  |  |  | $ 25,000,000 |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |
Net proceeds after fees and expenses of purchase agreement |  |  |  |  |  |  |  |  | 23,200,000 |  |  |  |  |  |  |  |  |  |  |
Shares registered for resale | 10,262,311 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of senior convertible notes |  |  |  |  | 7.00% |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Conversion price |  |  |  |  |  |  |  | $ 4.85 |  | $ 4.85 |  | $ 3.19 |  |  |  |  |  |  |  |
Derivative liability of note |  | 5,605,000 | 5,605,000 | 1,500,000 | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |  |  |  |  |  |  |
Number of shares issued for converted payment |  |  |  |  |  |  |  |  |  |  |  | 1,715,443 |  |  |  |  |  |  |  |
Price failure equity condition percentage |  |  |  |  |  |  |  |  |  | $ 2.50 |  | $ 1.00 |  |  |  |  |  |  |  |
Aggregate daily dollar trading volume |  |  |  |  |  |  |  |  |  | 1,500,000 |  | 850,000 |  |  |  |  |  |  | 50,000 | 850,000
Beneficial ownership limitation percentage |  |  |  |  |  |  |  |  |  | 4.99% |  | 9.99% |  |  |  |  |  |  |  |
Increase in derivative liability |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash interest expense amortization of debt discount |  |  |  |  |  | 2,200,000 | 6,400,000 |  |  |  |  |  |  | 200,000 | 500,000 |  | 3,900,000 | 8,400,000 |  |
Percentage of stock discount |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash interest expense issuing stock at discount |  | 1,500,000 | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to issue additional principal amount |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |
Legal and origination costs |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  | 300,000 |  |  |  |  |
Total debt discount being amortized into interest expense |  |  |  |  |  | 13,100,000 | 13,100,000 |  |  |  |  | 500,000 |  | 1,200,000 | 1,200,000 |  |  |  |  |
End of term fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |
Premium over closing price |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Value of warrants received to purchase common stock |  |  |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |
Prime rate, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |
Number of shares received from warrants received to purchase common stock |  |  |  |  |  |  |  |  |  |  |  |  | 139,276 |  |  |  |  |  |  |
Fair value of warrants at issuance |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |
Strike price per share |  |  |  |  | $ 5.45 |  |  |  |  |  |  |  | $ 3.59 |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,600,000 | 10,300,000 |  |
Borrowed amount |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  | 10,000,000 |  |  |  |
Proceeds from the issuance of debt, net of expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,700,000 |  |  |  |
Covenant, unrestricted cash balance requirement |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  |  |
Period before first installment payment |  |  |  |  |  |  |  |  | 4 months |  |  |  |  |  |  |  |  |  |  |

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