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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income (loss) $ 40,997 $ (5,236)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Provision for doubtful accounts (68) 129
Depreciation and amortization 6,412 6,288
Deferred income taxes (22) 24
Loss on disposals of fixed assets 117 0
Gain on sale of Videotel (54,520) 0
Compensation expense related to stock-based awards and employee stock purchase plan 1,907 1,592
Unrealized currency translation gain (289) (212)
Changes in operating assets and liabilities:    
Accounts receivable (1,186) (1,719)
Inventories (1,308) (137)
Prepaid expenses, other current assets, and current contract assets 272 230
Other non-current assets and non-current contract assets (1,466) (1,252)
Accounts payable (22) 908
Contract liabilities and long-term contract liabilities 2,472 527
Accrued compensation, product warranty and other current liabilities 1,049 (2,331)
Other long-term liabilities (928) (9)
Net cash used in operating activities (6,583) (1,198)
Cash flows from investing activities:    
Capital expenditures (6,720) (7,461)
Cash paid for acquisition of intangible asset (37) 0
Proceeds from sale of fixed assets 103 0
Proceeds from sale of Videotel, net of cash sold 88,447 0
Purchases of marketable securities (50,032) (2,036)
Maturities and sales of marketable securities 0 10,020
Net cash provided by investing activities 31,761 523
Cash flows from financing activities:    
Repayments of long-term debt (2,597) (89)
Repayments of term note borrowings (21,938) (3,400)
Repayments of line of credit borrowings (13,000) 0
Proceeds from line of credit borrowings 10,000 0
Proceeds from stock options exercised and employee stock purchase plan 365 101
Sale of treasury stock 0 4,500
Payment of finance lease (304)  
Payment of finance lease   (258)
Net cash (used in) provided by financing activities (27,474) 854
Effect of exchange rate changes on cash and cash equivalents (448) (238)
Net decrease in cash and cash equivalents (2,744) (59)
Cash and cash equivalents at beginning of period 18,050 34,596
Cash and cash equivalents at end of period 15,306 34,537
Supplemental disclosure of non-cash investing activities:    
Changes in accrued other and accounts payable related to property and equipment additions $ 229 $ 624