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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net loss $ (25,135) $ (26,224)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 5,343 6,628
Stock-based compensation expense 4,287 4,039
Restructuring charges, net of payments 161 (49)
Provision for excess and obsolete inventory 192 421
Adverse purchase commitment recoveries, net   (8,309)
Loss on minority interest investments 499 1,490
Change in fair value of derivatives and warrants (1,355) (897)
Non-cash interest expense 4,765 4,443
Other non-cash items 892 350
Changes in operating asset and liability accounts:    
Accounts receivable 10,704 2,856
Inventory 9,315 (971)
Prepaid expenses and other current assets 3,531 8,394
Accounts payable and accrued expenses (9,105) (14,900)
Deferred revenue (18,873) (2,236)
Net cash used in operating activities (14,779) (24,965)
Cash flows from investing activities:    
Purchase of property, plant and equipment (115) (903)
Proceeds from the maturity of marketable securities   84
Change in restricted cash 4,053 (4,116)
Change in other assets (495)  
Net cash provided by (used in) investing activities 3,443 (4,935)
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (57) (36)
Proceeds from the issuance of debt, net of expenses   32,895
Repayment of debt (2,308)  
Proceeds from exercise of employee stock options and ESPP 99 178
Net cash (used in) provided by financing activities (2,266) 33,037
Effect of exchange rate changes on cash and cash equivalents 226 (280)
Net (decrease) increase in cash and cash equivalents (13,376) 2,857
Cash and cash equivalents at beginning of year 39,243 46,279
Cash and cash equivalents at end of period 25,867 49,136
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds   (752)
Issuance of common stock to settle liabilities 7,831 2,676
Cash paid for interest $ 400 $ 269