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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net income (loss) $ 35,114 $ (26,782)
Adjustments to reconcile net income (loss) to net cash used in operations:    
Depreciation and amortization 3,455 9,239
Stock-based compensation expense 2,402 2,115
Provision for excess and obsolete inventory 686 415
(Gain) on sale of minority interest (127) (951)
Change in fair value of warrants and contingent consideration 2,658 (1,397)
Non-cash interest (income) expense (168) 19
Other non-cash items (1,692) 81
Changes in operating asset and liability accounts:    
Accounts receivable (724) (3,576)
Inventory 3,320 180
Prepaid expenses and other current assets (1,380) 647
Accounts payable and accrued expenses 4,603 638
Deferred revenue (361) (862)
Net cash provided by/(used in) operating activities 47,786 (20,234)
Cash flows from investing activities:    
Purchase of property, plant and equipment (709) (2,125)
Proceeds from the sale of property, plant and equipment 138 18
Cash paid for acquisition, net of cash acquired 0 74
Proceeds from sale of minority interest 127 951
Change in other assets (206) 26
Net cash provided by/(used in) investing activities (650) (1,056)
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (456) (274)
Repayment of debt 0 (1,575)
Proceeds from public equity offering, net 0 16,952
Proceeds from exercise of employee stock options and ESPP 71 85
Net cash provided by/(used in) financing activities (385) 15,188
Effect of exchange rate changes on cash (792) 636
Net increase in cash, cash equivalents and restricted cash 45,959 (5,466)
Cash, cash equivalents and restricted cash at beginning of period 34,248 27,744
Cash, cash equivalents and restricted cash at end of period 80,207 22,278
Supplemental schedule of cash flow information:    
Issuance of common stock in connection with the purchase of Infinia Technology Corporation 0 3,498
Cash paid for income taxes, net of refunds 2,792 1,012
Issuance of common stock to settle liabilities 235 252
Cash paid for interest $ 0 $ 42