CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	[1]	$ 402,874	$ 403,558	$ 358,246
Total cost of revenue		179,862	194,349	188,426
Total gross profit		223,012	209,209	169,820
Operating expenses:
Research and development		84,614	89,163	95,978
Selling, general and administrative		119,035	118,952	136,270
Amortization of intangibles		3,139	3,187	3,142
Restructuring and related charges		3,141	2,918	5,307
Total operating expenses		209,929	214,220	240,697
Income (loss) from operations		13,083	(5,011)	(70,877)	[2]
Interest expense, net		(11,651)	(11,401)	(11,078)
Loss on debt extinguishment		(5,695)	0	0
Other expense, net		(2,333)	(536)	(2,222)
Loss on impairment of long-term investments		0	0	(530)
Loss before income taxes		(6,596)	(16,948)	(84,707)	[2]
Provision for (benefit from) income taxes		(672)	4,087	(1,752)
Net loss		$ (5,924)	$ (21,035)	$ (82,955)
Net loss per share:
Basic and diluted		$ (0.07)	$ (0.25)	$ (1.02)
Shares used in per share calculations:
Basic and diluted		89,575	85,615	80,974
Appliance & Integration [Member]
Revenue		$ 275,797	$ 287,564	$ 246,353
Total cost of revenue		130,284	148,472	142,545
SaaS and service
Revenue		127,077	115,994	111,893
Total cost of revenue		$ 49,578	$ 45,877	$ 45,881

[1] Revenue is attributed to countries based on the location of the customer.

[2] 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.