Accrued Expenses and Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Accrued Expenses and Other Liabilities

Schedule of accrued expenses and other current liabilities

	December 31,
	2018		2017
	(in thousands)
Payroll and related benefits	$	20,486	$	32,996
Warranty		7,852		6,532
Interest		4,321		4,430
Professional fees		2,897		3,942
Merger consideration payable		—		2,662
Sales, use, and other taxes		2,670		2,144
Restructuring liability		2,213		1,520
Other		6,011		3,842
Total	$	46,450	$	58,068

Schedule of changes in deferred revenue

	(in thousands)
Balance - December 31, 2017	$	70,536
Deferral of revenue		10,251
Recognition of previously deferred revenue		(36,372)
Balance - December 31, 2018	$	44,415