|12 Months Ended
Dec. 31, 2018
|Restructuring and Related Activities [Abstract]
From time to time, the Company approves and implements restructuring plans as a result of acquisitions, internal resource alignment, and cost saving measures. Such restructuring plans include terminating employees, vacating certain leased facilities, and cancellation of contracts.
The following table presents the activity related to the plans, which is included in restructuring charges in the consolidated statements of operations:
Included in employee separation expenses for the year ended December 31, 2017 is stock-based compensation from the acceleration of certain stock-based awards the Company assumed from Exar due to existing change in control provisions triggered upon termination or diminution of authority of former Exar executives of $5.1 million.
Lease related and other charges primarily related to exiting certain redundant facilities. The lease related restructuring charges in the 2016 period also included adjustments to the estimates of net present value of the remaining lease obligation associated with certain vacated facilities that are under assumed lease arrangements. Total sublease income related to leased facilities the Company ceased using was approximately $2.4 million, $2.1 million and $1.3 million for the for the years ended December 31, 2018, 2017, and 2016 respectively. The Company does not expect to incur additional material costs related to 2018 restructuring plans.
The following table presents a roll-forward of the Company's restructuring liability for the years ended December 31, 2018 and 2017. The restructuring liability is included in accrued expenses and other current liabilities in the consolidated balance sheets.