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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net loss $ (8,710) $ (5,403)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 1,401 1,268
Stock-based compensation expense 1,033 1,292
Provision for excess and obsolete inventory 346 624
Deferred income taxes 61 (2,207)
Change in fair value of contingent consideration 170 100
Non-cash interest income 0 (24)
Other non-cash items (127) 124
Unrealized foreign exchange loss on cash and cash equivalents 0 3
Changes in operating asset and liability accounts:    
Accounts receivable (1,426) (7,388)
Inventory (9,633) (465)
Prepaid expenses and other assets 580 463
Accounts payable and accrued expenses 6,343 8,563
Deferred revenue 4,099 (2,779)
Net cash used in operating activities (5,863) (5,829)
Cash flows from investing activities:    
Purchase of property, plant and equipment (441) (224)
Cash paid for acquisition, net of cash acquired 0 (11,479)
Change in other assets (55) (5)
Net cash used in investing activities (496) (11,708)
Cash flows from financing activities:    
Repurchase of treasury stock 0 (46)
Repayment of debt (20) 0
Net cash used in financing activities (20) (46)
Effect of exchange rate changes on cash (17) (5)
Net decrease in cash, cash equivalents and restricted cash (6,396) (17,588)
Cash, cash equivalents and restricted cash at beginning of period 49,486 75,539
Cash, cash equivalents and restricted cash at end of period 43,090 57,951
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 49 149
Non-cash investing and financing activities    
Issuance of common stock to settle liabilities 138 1,793
Neeltran Inc. [Member]    
Non-cash investing and financing activities    
Issuance of common stock in connection with the purchase of Neeltran, Inc. $ 0 $ 4,387