Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 33,255	$ (8,232)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Provision for doubtful accounts	(131)	657
Depreciation and amortization	11,487	12,857
Deferred income taxes	203	(781)
Loss on disposals of fixed assets	189	17
Gain on sale of Videotel	(53,711)	0
Compensation expense related to stock-based awards and employee stock purchase plan	4,159	3,321
Unrealized currency translation loss (gain)	71	(377)
Changes in operating assets and liabilities:
Accounts receivable	(4,344)	(2,183)
Inventories	(553)	(174)
Prepaid expenses, other current assets, and current contract assets	(307)	(286)
Other non-current assets and non-current contract assets	(1,042)	(2,054)
Accounts payable	(1,916)	2,041
Deferred revenue, contract liabilities, and long-term contract liabilities	1,170	(498)
Accrued compensation, product warranty, and other	(2,691)	874
Other long-term liabilities	(4)	2
Net cash (used in) provided by operating activities	(14,165)	5,184
Cash flows from investing activities:
Capital expenditures	(12,526)	(15,897)
Cash paid for acquisition of intangible assets	(94)	(44)
Proceeds from sale of fixed assets	103	0
Proceeds from sale of Videotel, net of cash sold	88,447	0
Purchases of marketable securities	(41,882)	(2,036)
Maturities and sales of marketable securities	12,000	10,330
Net cash provided by (used in) investing activities	46,048	(7,647)
Cash flows from financing activities:
Repayments of long-term debt	(2,597)	(182)
Repayments of term note borrowings	(21,938)	(22,507)
Repayments of line of credit borrowings	(15,000)	0
Proceeds from line of credit borrowings	10,000	5,000
Proceeds from stock options exercised and employee stock purchase plan	700	484
Repurchase of common stock	(1,297)	0
Sale of treasury stock	0	4,500
Payment of finance lease	(624)	(561)
Net cash used in financing activities	(30,756)	(13,266)
Effect of exchange rate changes on cash and cash equivalents	(812)	(817)
Net increase (decrease) in cash and cash equivalents	315	(16,546)
Cash and cash equivalents at beginning of period	18,050	34,596
Cash and cash equivalents at end of period	18,365	18,050
Supplemental disclosure of cash flow information:
Cash paid for interest	929	1,679
Cash paid for income taxes, net of refunds	424	2,578
Changes in accrued other and accounts payable related to property and equipment additions	126	244
Satellite hubs acquired under finance lease	0	3,068
Cash in current assets held for sale	0	2,838
Right of use assets (ROU) assets arising from entering into new operating lease obligations	$ 494	$ 0