Detail of Certain Balance Sheet Accounts (Tables)

12 Months Ended

Dec. 31, 2019

Detail of Certain Balance Sheet Accounts

Schedule of activity in allowance for doubtful accounts

Activity in our allowance for doubtful accounts consists of the following (in thousands):

	December 31,
	2019		2018		2017
Balance at beginning of year	$	5,898	$	3,400	$	4,288
Bad debt expense (benefit)		2,978		3,562		182
Deductions for uncollectible receivables written off, net of recoveries		(3,924)		(1,304)		(1,829)
Allowance for doubtful accounts of acquired companies at date of acquisition		1,955		240		759
Balance at end of year	$	6,907	$	5,898	$	3,400

Schedule of other current liabilities

Other current liabilities consist of the following (in thousands):

	December 31,
	2019		2018
Accrued warranty costs	$	7,452	$	6,453
Current lease liability		14,016		—
Accrued job losses		2,226		1,495
Accrued sales and use tax		2,938		2,685
Deferred revenue		5,506		5,233
Liabilities due to former owners		11,219		2,045
Other current liabilities		38,273		14,941
	$	81,630	$	32,852