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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net (loss) income $ (9,766) $ 41,082
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Provision for doubtful accounts 482 (68)
Depreciation and amortization 5,402 6,412
Deferred income taxes 0 26
Loss on disposals of fixed assets 400 117
Gain on sale of Videotel 0 (54,520)
Compensation expense related to stock-based awards and employee stock purchase plan 1,547 1,907
Unrealized currency translation (gain) loss (950) 746
Changes in operating assets and liabilities:    
Accounts receivable 3,739 (1,186)
Inventories (993) (1,308)
Prepaid expenses, other current assets, and current contract assets 161 2,055
Other non-current assets and non-current contract assets (422) 876
Accounts payable (2,395) (22)
Contract liabilities and long-term contract liabilities (460) (2,803)
Accrued compensation, product warranty and other 365 1,031
Other long-term liabilities 4 (928)
Net cash used in operating activities (2,886) (6,583)
Cash flows from investing activities:    
Capital expenditures (7,049) (6,720)
Cash paid for acquisition of intangible asset (40) (37)
Proceeds from sale of fixed assets 6 103
Proceeds from sale of Videotel, net of cash sold 0 88,447
Purchases of marketable securities (6,091) (50,032)
Maturities and sales of marketable securities 13,500 0
Net cash provided by investing activities 326 31,761
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 (13,000)
Proceeds from line of credit borrowings 0 10,000
Proceeds from stock options exercised and employee stock purchase plan 207 365
Repurchase of common stock (390) 0
Payment of finance lease (312) (304)
Net cash provided by (used in) financing activities 6,432 (27,474)
Effect of exchange rate changes on cash and cash equivalents (794) (448)
Net increase (decrease) in cash and cash equivalents 3,078 (2,744)
Cash and cash equivalents at beginning of period 18,365 18,050
Cash and cash equivalents at end of period 21,443 15,306
Supplemental disclosure of non-cash investing activities:    
Changes in accrued other and accounts payable related to property and equipment additions $ 128 $ 229