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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net loss $ (18,590) $ (9,837)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 2,799 2,631
Stock-based compensation expense 2,052 2,393
Provision for excess and obsolete inventory 1,015 1,203
Deferred income taxes 63 (2,137)
Change in fair value of contingent consideration (120) (2,330)
China dissolution 1,921 0
Other non-cash items (134) 197
Unrealized foreign exchange loss on cash and cash equivalents (3) 1
Changes in operating asset and liability accounts:    
Accounts receivable (92) (8,657)
Inventory (13,749) (475)
Prepaid expenses and other assets 211 1,521
Accounts payable and accrued expenses 6,885 3,475
Deferred revenue 6,170 281
Net cash used in operating activities (11,572) (11,734)
Cash flows from investing activities:    
Purchase of property, plant and equipment (560) (510)
Cash paid for acquisition, net of cash acquired 0 (11,479)
Proceeds from the maturity of marketable securities 0 5,189
Change in other assets (99) (30)
Net cash used in investing activities (659) (6,830)
Cash flows from financing activities:    
Repurchase of treasury stock 0 (46)
Repayment of debt (33) (18)
Proceeds from exercise of employee stock options and ESPP 128 125
Net cash provided by financing activities 95 61
Effect of exchange rate changes on cash 4 (47)
Net decrease in cash, cash equivalents and restricted cash (12,132) (18,550)
Cash, cash equivalents and restricted cash at beginning of period 49,486 75,539
Cash, cash equivalents and restricted cash at end of period 37,354 56,989
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 152 306
Non-cash investing and financing activities    
Issuance of common stock to settle liabilities $ 317 $ 2,529