Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments Under Noncancelable Operating Leases

Future minimum lease payments under non-cancellable operating leases at December 31, 2018, are as follows (in thousands):

	Operating Leases
Year ending December 31,
2019	$	13,515
2020	10,139
2021	4,088
2022	2,523
2023	2,220
Thereafter	6,694
Total minimum payments	$	39,179

Summary of Warranty Accrual Included in Accrued Liabilities

Activities for the Company’s warranty accrual for each fiscal year, which is included in accrued and other current liabilities, is summarized below (in thousands):

	2018			2017			2016
Balance at beginning of period	$	4,381		$	4,862		$	3,913
Accrual for current period warranties	6,612			5,117			5,482
Balance assumed from TVN acquisition	—			—			1,012
Warranty costs incurred	(6,124		)	(5,598		)	(5,545		)
Balance at end of period	$	4,869		$	4,381		$	4,862