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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net loss $ (38,939) $ (25,135)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 4,901 5,343
Stock-based compensation expense 3,099 4,287
Impairment of long-lived and intangible assets 3,464  
Provision for excess and obsolete inventory 1,285 192
Loss on minority interest investments 410 499
Change in fair value of derivatives and warrants (760) (1,355)
Non-cash interest expense 343 4,765
Other non-cash items (860) 892
Changes in operating asset and liability accounts:    
Accounts receivable (2,264) 10,704
Inventory (5,283) 9,315
Prepaid expenses and other current assets (1,533) 3,531
Accounts payable and accrued expenses 4,154 (8,944)
Accrued arbitration liability 10,188  
Deferred revenue 10,426 (18,873)
Net cash used in operating activities (11,369) (14,779)
Cash flows from investing activities:    
Purchase of property, plant and equipment (514) (115)
Proceeds from the sale of property, plant and equipment 8  
Change in restricted cash 2,782 4,053
Change in other assets (12) (495)
Net cash provided by investing activities 2,264 3,443
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (400) (57)
Repayment of debt (3,641) (2,308)
Proceeds from ATM sales, net 4,825  
Proceeds from exercise of employee stock options and ESPP 60 99
Net cash provided by (used in) financing activities 844 (2,266)
Effect of exchange rate changes on cash and cash equivalents (174) 226
Net decrease in cash and cash equivalents (8,435) (13,376)
Cash and cash equivalents at beginning of year 43,114 39,243
Cash and cash equivalents at end of year 34,679 25,867
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 226  
Issuance of common stock to settle liabilities 1,528 7,831
Cash paid for interest $ 684 $ 400