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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net loss $ (10,513) $ (10,275)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operations:    
Depreciation and amortization 2,655 3,344
Stock-based compensation expense 2,135 1,994
Restructuring charges, net of payments (27) (39)
Provision for excess and obsolete inventory 160 250
Adverse purchase commitment recoveries, net   (7,301)
Loss on minority interest investments 248 812
Change in fair value of derivatives and warrants (469) 2,388
Non-cash interest expense 1,672 2,282
Other non-cash items 686 200
Changes in operating asset and liability accounts:    
Accounts receivable 8,111 4,132
Inventory 2,861 136
Prepaid expenses and other current assets (1,151) 848
Accounts payable and accrued expenses (5,464) (6,449)
Deferred revenue (10,211) (3,913)
Net cash used in operating activities (9,307) (11,591)
Cash flows from investing activities:    
Purchase of property, plant and equipment (97) (88)
Proceeds from the maturity of marketable securities   100
Proceeds from the sale of property, plant and equipment 25  
Change in restricted cash 4,051 (6,858)
Change in other assets (205)  
Net cash provided by (used in) investing activities 3,774 (6,846)
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   32,961
Repayment of debt (1,154)  
Net cash (used in) provided by financing activities (1,211) 32,925
Effect of exchange rate changes on cash and cash equivalents 109 (280)
Net (decrease) increase in cash and cash equivalents (6,635) 14,208
Cash and cash equivalents at beginning of period 39,243 46,279
Cash and cash equivalents at end of period 32,608 60,487
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 145 (828)
Issuance of common stock to settle liabilities 1,832 1,016
Cash paid for interest $ 216