CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Revenue	[1]	$ 403,558	$ 358,246		$ 405,911
Total cost of revenue		194,349	188,426		205,161
Total gross profit		209,209	169,820		200,750
Operating expenses:
Research and development		89,163	95,978		98,401
Selling, general and administrative		118,952	136,270		144,381
Amortization of intangibles		3,187	3,142		10,402
Restructuring and related charges		2,918	5,307		14,602	[2]
Total operating expenses		214,220	240,697		267,786
Loss from operations		(5,011)	(70,877)	[3]	(67,036)	[3]
Interest expense, net		(11,401)	(11,078)		(10,628)
Other expense, net		(536)	(2,222)		(31)
Loss on impairment of long-term investments		0	(530)		(2,735)
Loss before income taxes		(16,948)	(84,707)	[3]	(80,430)	[3]
Provision for (benefit from) income taxes		4,087	(1,752)		(8,116)
Net loss		$ (21,035)	$ (82,955)		$ (72,314)
Net loss per share:
Basic and diluted		$ (0.25)	$ (1.02)		$ (0.93)
Shares used in per share calculations:
Basic and diluted		85,615	80,974		77,705
Product [Member]
Revenue		$ 252,067	$ 224,645		$ 285,260
Total cost of revenue		127,268	119,802		145,714
Service [Member]
Revenue		151,491	133,601		120,651
Total cost of revenue		$ 67,081	$ 68,624		$ 59,447

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

[2] The restructuring and related charges for the fiscal year ended December 31, 2016 is net of $0.6 million and $1.4 million, in Cost of revenue and Operating expenses - Restructuring and related charges, respectively, of gain from TVN pension curtailment. See “Harmonic 2016 Restructuring Plan” below for additional information.

[3] 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.