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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net (loss) income $ (21,940,000) $ 33,255,000
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Provision for doubtful accounts 333,000 (131,000)
Depreciation and amortization 11,663,000 11,487,000
Impairment charge to goodwill and intangibles 10,490,000 0
Deferred income taxes (283,000) 203,000
Loss on disposals of fixed assets 713,000 189,000
Gain on sale of Videotel 0 (53,711,000)
Compensation expense related to stock-based awards and employee stock purchase plan 3,462,000 4,159,000
Unrealized currency translation loss 151,000 71,000
Changes in operating assets and liabilities:    
Accounts receivable (1,123,000) (4,344,000)
Inventories (1,205,000) (553,000)
Prepaid expenses, other current assets, and current contract assets (314,000) (307,000)
Other non-current assets and non-current contract assets (484,000) (1,042,000)
Accounts payable (3,274,000) (1,916,000)
Deferred revenue, contract liabilities, and long-term contract liabilities (817,000) 1,170,000
Accrued compensation, product warranty, and other (458,000) (2,691,000)
Other long-term liabilities 7,000 (4,000)
Net cash used in operating activities (3,079,000) (14,165,000)
Cash flows from investing activities:    
Capital expenditures (14,066,000) (12,526,000)
Cash paid for acquisition of intangible assets (75,000) (94,000)
Proceeds from sale of fixed assets 80,000 103,000
Proceeds from sale of Videotel, net of cash sold 0 88,447,000
Purchases of marketable securities (8,734,000) (41,882,000)
Maturities and sales of marketable securities 13,500,000 12,000,000
Net cash (used in) provided by investing activities (9,295,000) 46,048,000
Cash flows from financing activities:    
Repayments of long-term debt 0 (2,597,000)
Proceeds from PPP loan 6,927,000 0
Repayments of term note borrowings 0 (21,938,000)
Repayments of line of credit borrowings 0 (15,000,000)
Proceeds from line of credit borrowings 0 10,000,000
Proceeds from stock options exercised and employee stock purchase plan 1,216,000 700,000
Repurchase of common stock (390,000) (1,297,000)
Payment of finance lease (624,000) (624,000)
Net cash provided by (used in) financing activities 7,129,000 (30,756,000)
Effect of exchange rate changes on cash and cash equivalents (542,000) (812,000)
Net (decrease) increase in cash and cash equivalents (5,787,000) 315,000
Cash and cash equivalents at beginning of period 18,365,000 18,050,000
Cash and cash equivalents at end of period 12,578,000 18,365,000
Supplemental disclosure of cash flow information:    
Cash paid for interest 0 929,000
Cash paid for income taxes, net of refunds 1,051,000 424,000
Changes in accrued other and accounts payable related to property and equipment additions 165,000 126,000
Right of use assets (ROU) assets arising from entering into new operating lease obligations $ 3,032,000 $ 494,000