CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (21,035)	$ (82,955)		$ (72,314)
Adjustments to reconcile net loss to net cash provided by operating activities:
Amortization of intangibles	8,367	8,322	[1]	14,836	[1]
Depreciation	12,971	14,599		18,819
Stock-based compensation	17,289	16,610		13,060
Amortization of discount on convertible debt	6,060	5,489		4,964
Provision for non-cash warrant	1,178	153		434
Restructuring, asset impairment and loss on retirement of fixed assets	1,491	1,906		2,305
Loss on impairment of long-term investments	0	530		2,735
Unrealized foreign exchange (gain) loss	(1,906)	2,369		(856)
Gain on pension curtailment	0	0		(1,955)
Deferred income taxes, net	661	2,189		(10,085)
Provision for doubtful accounts, returns and discounts	2,521	4,912		2,589
Provision for excess and obsolete inventories	1,649	6,005		6,871
Other non-cash adjustments, net	407	445		408
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	(14,700)	12,598		(2,563)
Inventories	(2,045)	11,687		(4,107)
Prepaid expenses and other assets	3,227	6,642		(1,892)
Accounts payable	1,018	3,432		5,793
Deferred revenues	(4,808)	(392)		18,106
Income taxes payable	440	(2,978)		(133)
Accrued and other liabilities	(501)	(8,499)		3,423
Net cash provided by operating activities	12,284	3,064		438
Cash flows from investing activities:
Acquisition of business, net of cash and restricted cash acquired	0	0		(74,334)
Proceeds from maturities of investments	0	3,106		19,707
Proceeds from sales of investments	104	3,792		0
Purchases of property and equipment	(7,044)	(11,399)		(15,107)
Net cash used in investing activities	(6,940)	(4,501)		(69,734)
Cash flows from financing activities:
Payment of convertible debt issuance cost	0	0		(582)
Proceeds from other debts and capital leases	5,066	6,344		5,968
Repayment of other debts and capital leases	(7,132)	(7,408)		(8,338)
Proceeds from common stock issued to employees	4,947	4,716		4,444
Payment of tax withholding obligations related to net share settlements of restricted stock units	(230)	(2,757)		(1,644)
Net cash provided by (used in) financing activities	2,651	895		(152)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(763)	1,879		(415)
Net increase (decrease) in cash, cash equivalents and restricted cash	7,232	1,337		(69,863)
Cash, cash equivalents and restricted cash at beginning of period	58,757	57,420		127,283
Cash, cash equivalents and restricted cash at end of period	65,989	58,757		57,420
Supplemental disclosures of cash flow information:
Income tax payments (refunds), net	2,031	2,141		(54)
Interest payments, net	5,273	5,515		5,275
Supplemental schedule of non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	148	337		394
Issuance of warrant	2,295			1,597
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents	65,989	57,024		55,635
Total cash, cash equivalents and restricted cash	$ 58,757	$ 57,420		$ 127,283

[1] For the years ended December 31, 2017 and 2016, the unallocated corporate expenses included TVN acquisition- and integration-related costs, TVN VDP costs (see Note 10, “Restructuring and Related charges-TVN VDP,” for more information on TVN VDP ) and Cable Access product line inventory obsolescence costs, totaling $7.9 million and $32.2 million, respectively. In addition, in fiscal 2017, the unallocated corporate expenses included $8.0 million of Avid litigation settlement cost and associated legal fees (see Note 19, “Legal Proceedings,” for more information). The remaining unallocated corporate expenses for all years presented above include primarily other restructuring charges and excess facilities charges.