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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net (loss) income $ (10,303) $ 36,738
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Provision for doubtful accounts 490 (28)
Depreciation and amortization 8,277 8,893
Deferred income taxes 0 8
Loss on disposals of fixed assets 488 164
Gain on sale of Videotel 0 (53,701)
Compensation expense related to stock-based awards and employee stock purchase plan 2,459 3,019
Unrealized currency translation gain (492) (799)
Changes in operating assets and liabilities:    
Accounts receivable 852 (1,637)
Inventories (1,198) (2,412)
Prepaid expenses, other current assets, and current contract assets (88) (235)
Other non-current assets and non-current contract assets (776) (729)
Accounts payable (3,391) (2,331)
Contract liabilities and long-term contract liabilities (937) 2,229
Accrued compensation, product warranty and other 1,686 (612)
Other long-term liabilities 5 (17)
Net cash used in operating activities (2,928) (11,450)
Cash flows from investing activities:    
Capital expenditures (10,206) (9,335)
Cash paid for acquisition of intangible asset (58) (71)
Proceeds from sale of fixed assets 6 103
Proceeds from sale of Videotel, net of cash sold 0 88,447
Purchases of marketable securities (6,095) (50,300)
Maturities and sales of marketable securities 13,500 4,000
Net cash (used in) provided by investing activities (2,853) 32,844
Cash flows from financing activities:    
Repayments of mortgage loan 0 (2,597)
Proceeds from PPP loan 6,927 0
Repayments of term note borrowings 0 (21,938)
Repayments of line of credit borrowings 0 (15,000)
Proceeds from line of credit borrowings 0 10,000
Proceeds from stock options exercised and employee stock purchase plan 207 558
Repurchase of common stock (390) 0
Payment of finance lease (468) (457)
Net cash provided by (used in) financing activities 6,276 (29,434)
Effect of exchange rate changes on cash and cash equivalents (711) (767)
Net decrease in cash and cash equivalents (216) (8,807)
Cash and cash equivalents at beginning of period 18,365 18,050
Cash and cash equivalents at end of period 18,149 9,243
Supplemental disclosure of non-cash investing activities:    
Changes in accrued other and accounts payable related to property and equipment additions $ 265 $ 86