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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (9,837) $ (7,129)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 2,631 2,009
Stock-based compensation expense 2,393 1,758
Provision for excess and obsolete inventory 1,203 1,250
Deferred income taxes (2,137) 0
Change in fair value of contingent consideration (2,330) 0
Other non-cash items 197 233
Unrealized foreign exchange loss on cash and cash equivalents 1 272
Changes in operating asset and liability accounts:    
Accounts receivable (8,657) 157
Inventory (475) 3,591
Prepaid expenses and other assets 1,521 (866)
Accounts payable and accrued expenses 3,475 (3,192)
Deferred revenue 281 (4,636)
Net cash used in operating activities (11,734) (6,553)
Cash flows from investing activities:    
Purchase of property, plant and equipment (510) (1,326)
Sale of marketable securities 0 25,006
Cash paid for acquisition, net of cash acquired (11,479) 0
Proceeds from the maturity of marketable securities 5,189 0
Change in other assets (30) 63
Net cash (used)/provided by investing activities (6,830) 23,743
Cash flows from financing activities:    
Repurchase of treasury stock (46) (670)
Repayment of debt (18) 0
Proceeds from exercise of employee stock options and ESPP 125 99
Net cash provided/(used) by financing activities 61 (571)
Effect of exchange rate changes on cash (47) 53
Net increase/(decrease) in cash, cash equivalents and restricted cash (18,550) 16,672
Cash, cash equivalents and restricted cash at beginning of period 75,539 30,864
Cash, cash equivalents and restricted cash at end of period 56,989 47,536
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 306 275
Non-cash investing and financing activities    
Issuance of common stock to settle liabilities $ 2,529 $ 189