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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:    
Net loss $ (26,782) $ (20,448)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 9,239 5,606
Stock-based compensation expense 2,115 2,266
Provision for excess and obsolete inventory 415 1,074
Gain on sale of minority interest (951) (325)
Change in fair value of warrants and contingent consideration (1,397) (667)
Non-cash interest expense 19 127
Other non-cash items 81 (937)
Changes in operating asset and liability accounts:    
Accounts receivable (3,576) 3,213
Inventory 180 (2,294)
Prepaid expenses and other current assets 647 2,283
Accounts payable and accrued expenses 638 (4,031)
Deferred revenue (862) 3,598
Net cash used in operating activities (20,234) (10,535)
Cash flows from investing activities:    
Purchase of property, plant and equipment (2,125) (557)
Proceeds from the sale of property, plant and equipment 18 15
Change in restricted cash 795 457
Cash paid for acquisition, net of cash acquired 74 0
Proceeds from sale of minority interest 951 325
Change in other assets 26 117
Net cash (used in)/provided by investing activities (261) 357
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (274) (490)
Repayment of debt (1,575) (3,167)
Proceeds from public equity offering, net 16,952 0
Proceeds from exercise of employee stock options and ESPP 85 0
Net cash provided by/(used in) financing activities 15,188 (3,657)
Effect of exchange rate changes on cash and cash equivalents 636 (432)
Net decrease in cash and cash equivalents (4,671) (14,267)
Cash and cash equivalents at beginning of year 26,784 39,330
Cash and cash equivalents at end of year 22,113 25,063
Supplemental schedule of cash flow information:    
Issuance of common stock in connection with the purchase of Infinia Technology Corporation 3,498 0
Cash paid for income taxes, net of refunds 1,012 920
Issuance of common stock to settle liabilities 252 289
Cash paid for interest $ 42 $ 238