Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Summary of Significant Accounting Policies

Activity in the allowance for doubtful accounts

	Years Ended December 31,
	2019		2018		2017
Balances at Beginning of Year	$	39	$	137	$	781
Net charges to bad debt expense		1,183		464		426
Recoveries		(81)		(562)		—
Write-offs		(152)		—		(1,070)
Balances at End of Year	$	989	$	39	$	137

Summary of estimated useful lives

Buildings	5-15 years
Machinery and office equipment	3-5 years
Furniture and fixtures	7 years
Software	3 years