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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (11,111) $ (35,041)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 4,494 5,361
Stock-based compensation expense 4,652 4,729
Provision for excess and obsolete inventory 1,970 1,467
Deferred income taxes 65 24
Change in fair value of contingent consideration 4,922 70
China dissolution 0 1,921
Other non-cash items 44 600
Unrealized foreign exchange gain on cash and cash equivalents (2) (226)
Changes in operating asset and liability accounts:    
Accounts receivable 4,340 (10,360)
Inventory (6,841) (14,796)
Prepaid expenses and other current assets 6,313 (5,757)
Accounts payable and accrued expenses (13,825) 8,660
Deferred revenue 7,117 20,863
Net cash provided by (used in) operating activities 2,138 (22,485)
Cash flows from investing activities:    
Purchases of property, plant and equipment (934) (1,236)
Change in other assets (27) (281)
Net cash used in investing activities (961) (1,517)
Cash flows from financing activities:    
Repayment of debt (65) (73)
Proceeds from public equity offering, net 65,227 0
Proceeds from exercise of ESPP 279 235
Net cash provided by financing activities 65,441 162
Effect of exchange rate changes on cash, cash equivalents and restricted cash (13) 29
Net increase (decrease) in cash, cash equivalents and restricted cash 66,605 (23,811)
Cash, cash equivalents and restricted cash at beginning of year 25,675 49,486
Cash, cash equivalents and restricted cash at end of year 92,280 25,675
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 286 350
Non-cash investing and financing activities    
Issuance of common stock to settle contingent consideration 3,092 0
Issuance of common stock to settle liabilities $ 624 $ 623