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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 78 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Cash flows from operating activities:          
Net income (loss) $ 22,558 $ (7,281) $ 17,821 $ (22,533)  
Adjustments to reconcile net income (loss) to net cash used in operations:          
Depreciation and amortization     2,307 7,682  
Stock-based compensation expense 825 478 1,610 1,232  
Provision for excess and obsolete inventory 400 100 514 351  
(Gain) on sale of minority interest 0 (951) 0 (951)  
Change in fair value of warrants     182 (1,270)  
Non-cash interest (income) expense     (112) 19  
Other non-cash items     (727) (97)  
Changes in operating asset and liability accounts:          
Accounts receivable     (279) 124  
Inventory     1,278 1,354  
Prepaid expenses and other current assets     (572) 85  
Accounts payable and accrued expenses     2,166 (770)  
Deferred revenue     (593) 1,235  
Net cash provided by/(used in) operating activities     23,595 (13,539)  
Cash flows from investing activities:          
Purchase of property, plant and equipment     (418) (483)  
Proceeds from the sale of property, plant and equipment     138 12  
Cash paid for acquisition, net of cash acquired     0 134  
Proceeds from sale of minority interest     0 951  
Change in other assets     (131) (130)  
Net cash provided by/(used in) investing activities     (411) 484  
Cash flows from financing activities:          
Employee taxes paid related to net settlement of equity awards     (396) (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     (325) 15,188 $ 84,900
Effect of exchange rate changes on cash     (774) 608  
Net increase in cash, cash equivalents and restricted cash     22,085 2,741  
Cash, cash equivalents and restricted cash at beginning of period     34,249 27,744  
Cash, cash equivalents and restricted cash at end of period $ 56,334 $ 30,485 56,334 30,485 $ 56,334
Supplemental schedule of cash flow information:          
Issuance of common stock in connection with the purchase of Infinia Technology Corporation     0 3,557  
Cash paid for income taxes, net of refunds     1,438 753  
Issuance of common stock to settle liabilities     172 185  
Cash paid for interest     $ 0 $ 42