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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:      
Net loss $ (23,139) $ (48,656) $ (56,258)
Adjustments to reconcile net loss to net cash used in operations:      
Depreciation and amortization 7,972 9,554 10,615
Stock-based compensation expense 3,248 5,936 10,696
Impairment of minority interest investments 746 3,464 1,265
Provision for excess and obsolete inventory 2,713 1,386 316
Write-off prepaid taxes 289   1,426
Gain on sale from minority interest investments (3,092)    
Loss from minority interest investments 356 743 1,008
Change in fair value of derivatives and warrants 228 (3,963) (1,872)
Loss on extinguishment of debt     5,197
Reversal of Catlin legal costs   (2,220)  
Non-cash interest expense 359 566 7,713
Other non-cash items 1,462 (2,436) 1,980
Changes in operating asset and liability accounts:      
Accounts receivable (9,318) (2,677) 11,379
Inventory (782) (1,887) 13,043
Prepaid expenses and other current assets 5,608 (2,330) 12,512
Accounts payable and accrued expenses 1,543 5,579 (10,861)
Deferred revenue 7,248 4,265 (21,426)
Net cash used in operating activities (4,559) (32,676) (13,267)
Cash flows from investing activities:      
Purchase of property, plant and equipment (1,201) (737) (278)
Proceeds from the sale of property, plant and equipment 47 18 54
Change in restricted cash 2,669 2,248 4,669
Proceeds from sale of minority interests 3,092    
Change in other assets 266 280 (436)
Net cash provided by investing activities 4,873 1,809 4,009
Cash flows from financing activities:      
Employee taxes paid related to net settlement of equity awards (110) (401) (57)
Proceeds from the issuance of debt, net of expenses   1,422 9,842
Repayment of debt (4,000) (7,295) (4,615)
Proceeds from public equity offering, net 22,282 14,933 7,458
Proceeds from exercise of employee stock options and ESPP 30 124 168
Net cash provided by financing activities 18,202 8,783 12,796
Effect of exchange rate changes on cash and cash equivalents 324 (540) 333
Net increase/(decrease) in cash and cash equivalents 18,840 (22,624) 3,871
Cash and cash equivalents at beginning of year 20,490 43,114 39,243
Cash and cash equivalents at end of year 39,330 20,490 43,114
Supplemental schedule of cash flow information:      
Cash paid for income taxes, net of refunds 1,723 362 864
Issuance of common stock to settle liabilities 377 1,715 24,407
Cash paid for interest $ 709 $ 1,362 $ 990