Accrued Expenses and Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Accrued Expenses and Other Liabilities

Schedule of accrued expenses and other current liabilities

	December 31,		December 31,
	2019		2018
	(in thousands)
Payroll and related benefits	$	15,174	$	20,486
Warranty		7,067		7,852
Operating lease liabilities		4,196		—
Interest		4,321		4,321
Professional fees		2,443		2,897
Sales, use, and other taxes		811		2,670
Restructuring liability		2,841		2,213
Other		4,390		6,011
Total	$	41,243	$	46,450

Schedule of changes in deferred revenue

	(in thousands)
Balance - December 31, 2018	$	44,415
Deferral of revenue		5,816
Recognition of previously deferred revenue		(21,982)
Balance - December 31, 2019	$	28,249