SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Property and Equipment, Depreciable Lives

Depreciable lives are generally as follows:

Building and building improvements	25 to 30 years
Furniture and fixtures	5 to 7 years
Computer equipment	3 to 5 years
Business software	3 years
Office and other equipment	5 to 7 years
Instruments	5 years
Sample inventory	2 years

Summary of Activity in Allowance for Doubtful Accounts

The following table summarizes activity in the allowance for doubtful accounts:

	December 31,
	2020		2019		2018
Balance at beginning of year	$	506	$	134	$	143
Additions charged to expense	274		424		3
Write-offs	347		52		12
Balance at end of year	$	433	$	506	$	134