Summary of Significant Accounting Policies and Other Items (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Rollforward of the allowance for credit losses

The following is a rollforward of our allowance for credit losses:

	Balance at Beginning of Period		Expense		Write off		Balance at End of Period
Year Ended December 31, 2021	$	598	$	310	$	(167)	$	741
Year Ended December 31, 2020	837		342		(581)		598
Year Ended December 31, 2019	576		355		(94)		837

Rollforward of inventory obsolescence reserve

The following is a rollforward of our inventory obsolescence reserve:

	Balance at Beginning of Period		Expense		Write off		Translation Adjustments		Balance at End of Period
Year Ended December 31, 2021	$	14,637	$	3,490	$	(62)	$	(53)	$	18,012
Year Ended December 31, 2020	9,772		4,840		(53)		78		14,637
Year Ended December 31, 2019	7,310		2,552		(90)		—		9,772

Schedule of PP&E useful lives

Estimated useful lives are as follows:

Land	N/A
Buildings and improvements	5	-	30	years
Machinery and equipment	2	-	12	years
Vehicles under finance lease			3	years
Rental equipment	2	-	11	years
Furniture and fixtures			5	years
Computers and software			4	years

Property and equipment as of December 31, 2021 and 2020 consists of the following:

	December 31,
	2021		2020
Land	$	3,203	$	3,203
Buildings and improvements	22,532		21,935
Machinery and equipment	56,937		57,726
Vehicles under finance lease	23,450		14,371
Rental equipment	180,704		172,012
Furniture and fixtures	1,755		1,780
Computers and software	3,495		3,530
Gross property and equipment	292,076		274,557
Less: Accumulated depreciation	(175,992)		(147,221)
Net property and equipment	116,084		127,336
Construction in progress	13,033		15,489
Total property and equipment, net	$	129,117	$	142,825

Schedule of depreciation expense by income statement caption

Depreciation and amortization expense is included in the consolidated statements of income as follows:

	Year Ended December 31,
	2021		2020		2019
Cost of product revenue	$	3,176	$	3,506	$	3,304
Cost of rental revenue	25,812		28,063		24,881
Cost of field service and other revenue	6,863		8,075		9,986
Selling, general and administrative expenses	457		876		683
Total depreciation and amortization	$	36,308	$	40,520	$	38,854

Schedule of accrued expenses and other current liabilities

Accrued expenses and other current liabilities as of December 31, 2021 and 2020 are as follows:

	December 31,
	2021		2020
Accrued international freight and tariffs	$	14,794	$	2,087
Payroll, incentive compensation, payroll taxes and benefits	7,030		4,210
Deferred revenue	1,764		1,068
Taxes other than income	1,641		450
Income based tax payable	1,182		2,336
Accrued professional fees and other	1,078		687
Accrued dividends	346		271
Accrued workers’ compensation insurance	269		—
Product warranties	136		283
Total accrued expenses and other current liabilities	$	28,240	$	11,392