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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:    
Net loss $ (19,777) $ (45,292)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 6,050 7,298
Stock-based compensation expense 2,542 4,620
Impairment of minority interest investment 746 3,464
Provision for excess and obsolete inventory 1,835 1,401
Write-off prepaid taxes 289  
(Gain on sale)/loss from minority interest investment (2,155) 644
Change in fair value of derivatives and warrants (409) (3,048)
Non-cash interest expense 290 490
Other non-cash items 694 (838)
Changes in operating asset and liability accounts:    
Accounts receivable (7,156) (3,434)
Inventory 3,288 (7,598)
Prepaid expenses and other current assets 5,800 (3,072)
Accounts payable and accrued expenses (34) 5,694
Accrued arbitration liability   10,328
Deferred revenue 198 8,409
Net cash used in operating activities (7,799) (20,934)
Cash flows from investing activities:    
Purchase of property, plant and equipment (788) (681)
Proceeds from the sale of property, plant and equipment 30 20
Change in restricted cash 2,832 4,700
Proceeds from sale of minority-interest 2,511  
Change in other assets 271 316
Net cash provided by investing activities 4,856 4,355
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (110) (400)
Proceeds from the issuance of debt, net of expenses   1,429
Repayment of debt (3,000) (6,295)
Proceeds from ATM sales, net   5,839
Proceeds from public equity offering, net 22,282 9,114
Proceeds from exercise of employee stock options and ESPP 30 60
Net cash provided by financing activities 19,202 9,747
Effect of exchange rate changes on cash and cash equivalents (312) (299)
Net increase/(decrease) in cash and cash equivalents 15,947 (7,131)
Cash and cash equivalents at beginning of year 20,490 43,114
Cash and cash equivalents at end of year 36,437 35,983
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 1,120 362
Issuance of common stock to settle liabilities 286 1,623
Cash paid for interest $ 574 $ 937