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Summary of Significant Accounting Policies and Other Items (Tables)

12 Months Ended

Dec. 31, 2019

Preparation Of Interim Financial Statements And Other Items

Rollforward of the allowance for doubtful accounts


		Balance at												Balance at
		Beginning of			Expense									End of
		Period			(recovery)			Write off			Other			Period
Year Ended December 31, 2019		$	576		$	355		$	(94)		$	—		$	837
Year Ended December 31, 2018			740			—			(164)			—			576
Year Ended December 31, 2017			851			(100)			(3)			(8)			740

Rollforward of inventory obsolescence reserve


		Balance at												Balance at
		Beginning of												End of
		Period			Expense			Write off			Other			Period
Year Ended December 31, 2019		$	7,310		$	2,552		$	(90)		$	—		$	9,772
Year Ended December 31, 2018			5,885			1,451			—			(26)			7,310
Year Ended December 31, 2017			4,770			1,259			(103)			(41)			5,885

Schedule of PP&E useful lives


Land			N/A
Buildings		10	-	30	years
Machinery and equipment		2	-	12	years
Vehicles under finance lease				3	years
Rental equipment		2	-	8	years
Furniture and fixtures				5	years
Computers and software				4	years

Schedule of property and equipment net


		December 31,
		2019			2018
Land		$	3,203		$	3,614
Buildings and improvements			21,655			20,803
Machinery and equipment			55,494			47,606
Vehicles under finance lease			24,275			25,165
Rental equipment			161,156			124,002
Furniture and fixtures			1,684			1,623
Computers and software			3,317			3,094
Gross property and equipment			270,784			225,907
Less: Accumulated depreciation			(123,397)			(96,412)
Net property and equipment			147,387			129,495
Construction in progress			14,361			12,559
Total property and equipment, net		$	161,748		$	142,054

Schedule of depreciation expense by income statement caption


		Year Ended December 31,
		2019			2018			2017
Cost of product revenue		$	3,304		$	3,262		$	3,169
Cost of rental revenue			24,881			17,997			14,912
Cost of field service and other revenue			9,986			8,456			4,786
Selling, general and administrative expenses			683			438			404
Total depreciation and amortization		$	38,854		$	30,153		$	23,271

Schedule of accrued expenses and other current liabilities


		December 31,
		2019			2018
Payroll, incentive compensation, payroll taxes and benefits		$	10,708		$	7,842
Accrued international freight and tariffs			3,794			1,418
Income based tax payable			2,481			2,061
Accrued professional fees and other			1,790			1,512
Deferred revenue			1,371			1,110
Taxes other than income			767			1,414
Accrued workers' compensation insurance			600			—
Product warranties			556			293
Total		$	22,067		$	15,650