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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities:    
Net loss $ (6,512) $ (17,538)
Adjustments to reconcile net loss to net cash used by operating activities:    
Depreciation and amortization 3,642 4,052
Stock-based compensation expense 2,055 1,869
Deferred income tax 0 (5,343)
Loss (gain) on sale of property, plant and equipment 65 (101)
Provision for uncollectible accounts (88) 4
Accelerated amortization of deferred debt amendment fees (Note 5) 0 1,518
Other 63 0
Changes in operating assets and liabilities increasing (decreasing) cash:    
Accounts receivable 4,622 3,134
Costs and estimated earnings in excess of billings on uncompleted contracts (14,857) (2,992)
Inventories 1,595 1,028
Other assets and liabilities (3,370) (5,921)
Accounts payable (6,376) 5,108
Billings on uncompleted contracts in excess of costs and estimated earnings (11,820) (2,859)
Accrued expenses (4,248) (1,112)
Net cash used by operating activities (35,229) (19,153)
Investing activities:    
Capital expenditures (1,578) (219)
Proceeds from asset sales 4 103
Net cash used by investing activities (1,574) (116)
Financing activities:    
Payment of debt amendment fees 0 (922)
Proceeds from issuance of common stock under employee stock purchase plan 65 76
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (310) (853)
Other 0 (118)
Net cash used by financing activities (245) (1,817)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (981) (514)
Decrease in cash, cash equivalents and restricted cash (38,029) (21,600)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Period 77,371 83,878
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Period 39,342 62,278
Supplemental disclosure of cash flow information:    
Interest, including payment of debt amendment fees 421 1,603
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 101 $ 51