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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net loss $ (13,517) $ (10,513)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 2,475 2,655
Stock-based compensation expense 1,581 2,135
Non-cash portion of restructuring charges (44) (27)
Provision for excess and obsolete inventory 649 160
Loss on minority interest investments 202 248
Change in fair value of derivatives and warrants 35 (469)
Non-cash interest expense 190 1,672
Other non-cash items 93 686
Changes in operating asset and liability accounts:    
Accounts receivable (2,741) 8,111
Inventory 623 2,861
Prepaid expenses and other current assets 441 (1,151)
Accounts payable and accrued expenses (1,344) (5,464)
Deferred revenue 5,851 (10,211)
Net cash used in operating activities (5,506) (9,307)
Cash flows from investing activities:    
Purchase of property, plant and equipment (287) (97)
Proceeds from the sale of property, plant and equipment 5 25
Change in restricted cash 108 4,051
Change in other assets (93) (205)
Net cash (used in) provided by investing activities (267) 3,774
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (368) (57)
Repayment of debt (1,442) (1,154)
Proceeds from ATM sales, net 1,177  
Net cash used in financing activities (633) (1,211)
Effect of exchange rate changes on cash and cash equivalents (84) 109
Net decrease in cash and cash equivalents (6,490) (6,635)
Cash and cash equivalents at beginning of year 43,114 39,243
Cash and cash equivalents at end of year 36,624 32,608
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 34 145
Issuance of common stock to settle liabilities 1,431 1,832
Cash paid for interest $ 368 $ 216