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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net loss $ (17,680) $ (16,819)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 3,735 4,009
Stock-based compensation expense 1,653 1,834
Impairment of minority interest investments 0 746
Provision for excess and obsolete inventory 671 829
Write-off prepaid taxes 0 511
Loss from minority interest investments 0 356
Change in fair value of derivatives and warrants (567) (1,501)
Non-cash interest expense 98 207
Other non-cash items (103) 921
Changes in operating asset and liability accounts:    
Accounts receivable 7,118 (1,196)
Inventory (8,696) 3,478
Prepaid expenses and other current assets 2,843 2,957
Accounts payable and accrued expenses (4,481) (3,337)
Deferred revenue 4,497 (762)
Net cash used in operating activities (10,912) (7,767)
Cash flows from investing activities:    
Purchase of property, plant and equipment (359) (310)
Proceeds from the sale of property, plant and equipment 15 7
Change in restricted cash 4 (16)
Change in other assets (28) 91
Net cash used in investing activities (368) (228)
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (490) (109)
Repayment of debt (2,000) (2,000)
Proceeds from public equity offering, net 0 22,281
Proceeds from exercise of employee stock options and ESPP 0 30
Net cash (used in)/provided by financing activities (2,490) 20,202
Effect of exchange rate changes on cash and cash equivalents (298) (125)
Net (decrease)/increase in cash and cash equivalents (14,068) 12,082
Cash and cash equivalents at beginning of year 39,330 20,490
Cash and cash equivalents at end of year 25,262 32,572
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 894 758
Issuance of common stock to settle liabilities 212 197
Cash paid for interest $ 187 $ 391