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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net loss $ (10,275) $ (37,679)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operations:    
Depreciation and amortization 3,344 3,242
Stock-based compensation expense 1,994 3,466
Restructuring charges, net of payments (39)  
Provision for excess and obsolete inventory 250 413
Adverse purchase commitment losses (recoveries), net (7,301) 1,071
Loss on minority interest investments 812  
Change in fair value of derivatives and warrants 2,388  
Non-cash interest expense 2,282  
Other non-cash items 200 827
Changes in operating asset and liability accounts:    
Accounts receivable 4,132 670
Inventory 136 (5,324)
Prepaid expenses and other current assets 848 (7,812)
Accounts payable and accrued expenses (6,449) (19,732)
Deferred revenue (3,913) 3,084
Net cash (used in) operating activities (11,591) (57,774)
Cash flows from investing activities:    
Purchase of property, plant and equipment (88) (4,498)
Proceeds from the maturity of marketable securities 100 90,800
Increase in restricted cash (6,858) (3,763)
Purchase of intangible assets   (240)
Purchase of minority investments   (1,800)
Advanced payment for planned acquisition   (20,551)
Change in other assets   (195)
Net cash (used in) provided by investing activities (6,846) 59,753
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (36) (271)
Proceeds from the issuance of debt, net of expenses 32,961 4,626
Proceeds from exercise of employee stock options and ESPP   21
Net cash provided by financing activities 32,925 4,376
Effect of exchange rate changes on cash and cash equivalents (280) 747
Net increase in cash and cash equivalents 14,208 7,102
Cash and cash equivalents at beginning of period 46,279 123,783
Cash and cash equivalents at end of period 60,487 130,885
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds (828) 12,485
Issuance of common stock to settle liabilities $ 1,016 $ 205