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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating activities:    
Net loss $ (3,167) $ (6,512)
Adjustments to reconcile net loss to net cash used by operating activities:    
Depreciation and amortization 2,911 3,642
Stock-based compensation expense 1,755 2,055
Loss (gain) on sale of property, plant and equipment (Note 3) (2,366) 65
Other 72 (25)
Changes in operating assets and liabilities increasing (decreasing) cash:    
Accounts receivable (6,543) 4,622
Costs and estimated earnings in excess of billings on uncompleted contracts 2,519 (14,857)
Inventories (1,716) 1,595
Other assets and liabilities (7,669) (3,370)
Accounts payable (2,173) (6,376)
Billings on uncompleted contracts in excess of costs and estimated earnings (12,303) (11,820)
Accrued expenses (195) (4,248)
Net cash used by operating activities (28,875) (35,229)
Investing activities:    
Capital expenditures (478) (1,578)
Proceeds from Burlington office sale 2,618 4
Net cash provided (used) by investing activities 2,140 (1,574)
Financing activities:    
Proceeds from issuance of common stock under employee stock purchase plan 45 65
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (456) (310)
Net cash used by financing activities (411) (245)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (307) (981)
Net decrease in cash, cash equivalents and restricted cash (27,453) (38,029)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Period 79,812 77,371
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period 52,359 39,342
Supplemental disclosure of cash flow information:    
Income taxes (27) 0
Interest, including payment of debt amendment fees 389 421
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 6 $ 101