CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ (5,924)	$ (21,035)	$ (82,955)
Adjustments to reconcile net loss to net cash provided by operating activities:
Amortization of intangibles	8,319	8,367	8,322	[1]
Depreciation	11,287	12,971	14,599
Stock-based compensation	12,074	17,289	16,610
Amortization of discount on convertible debt	6,756	6,060	5,489
Amortization of non-cash warrant	13,576	1,178	153
Restructuring, asset impairment and loss on retirement of fixed assets	124	1,491	1,906
Loss on impairment of long-term investments	0	0	530
Foreign currency adjustments	(290)	(1,906)	2,369
Loss on debt extinguishment	5,695	0	0
Deferred income taxes, net	(2,076)	661	2,189
Provision for doubtful accounts, returns and discounts	1,500	2,521	4,912
Provision for excess and obsolete inventories	1,479	1,649	6,005
Other non-cash adjustments, net	1,225	407	445
Changes in operating assets and liabilities:
Accounts receivable	(8,388)	(14,700)	12,598
Inventories	(4,819)	(2,045)	11,687
Prepaid expenses and other assets	(3,347)	3,227	6,642
Accounts payable	5,086	1,018	3,432
Deferred revenues	(3,436)	(4,808)	(392)
Income taxes payable	(136)	440	(2,978)
Accrued and other liabilities	(7,410)	(501)	(8,499)
Net cash provided by operating activities	31,295	12,284	3,064
Cash flows from investing activities:
Proceeds from maturities of investments	0	0	3,106
Proceeds from sales of investments	0	104	3,792
Purchases of property and equipment	(10,328)	(7,044)	(11,399)
Net cash used in investing activities	(10,328)	(6,940)	(4,501)
Cash flows from financing activities:
Proceeds from convertible debt	115,500	0	0
Payments of convertible debt	(109,603)	0	0
Payment of convertible debt issuance costs	(4,277)
Proceeds from other debts and finance leases	4,684	5,066	6,344
Repayment of other debts and finance leases	(6,913)	(7,132)	(7,408)
Proceeds from common stock issued to employees	8,406	4,947	4,716
Payment of tax withholding obligations related to net share settlements of restricted stock units	(1,492)	(230)	(2,757)
Net cash provided by financing activities	6,305	2,651	895
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(203)	(763)	1,879
Net increase in cash, cash equivalents and restricted cash	27,069	7,232	1,337
Cash, cash equivalents and restricted cash at beginning of period	65,989	58,757	57,420
Cash, cash equivalents and restricted cash at end of period	93,058	65,989	58,757
Supplemental disclosures of cash flow information:
Income tax payments, net	1,138	2,031	2,141
Interest payments, net	4,260	5,273	5,515
Supplemental schedule of non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	2,055	148	337
Issuance of warrant	16,142	2,295	0
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents	93,058	65,989	57,024
Total cash, cash equivalents and restricted cash	$ 93,058	$ 65,989	$ 58,757

[1] For the year ended December 31, 2017, the unallocated corporate expenses included acquisition- and integration-related costs, French VDP costs (see Note 11, “Restructuring and Related charges,” for more information on French VDP) and Cable Access product line inventory obsolescence costs, totaling $7.9 million. In addition, in fiscal 2017, the unallocated corporate expenses included $8.0 million of Avid litigation settlement cost and associated legal fees (see Note 20, “Legal Proceedings,” for more information). The remaining unallocated corporate expenses for all years presented above include primarily other restructuring charges and excess facilities charges.