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Description of the company and summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Activity in Company's Allowance for Doubtful Accounts

The activity in the Company’s allowance for doubtful accounts as of December 31, was as follows:


		2015				2014
Balance at beginning of year		$	652			$	452
Charged to expense			641				204
(Write-offs), net of recoveries			(356	)			(4	)

Balance at end of year		$	937			$	652

Components of Inventories

Inventories consisted of the following as of December 31:


		2015				2014
Raw materials		$	104,433			$	87,133
Work in process			6,401				1,752
Finished goods			21,853				6,777

Total inventories			132,687				95,662
Inventory allowance			(2,340	)			(1,759	)

Inventories, net		$	130,347			$	93,903

Summary of Inventory Reserve Activity

The activity in the Company’s inventory allowance as of December 31 was as follows:


		2015				2014
Balance at beginning of year		$	1,759			$	1,510
Charged to expense			945				679
Write-offs			(364	)			(430	)

Balance at end of year		$	2,340			$	1,759

Schedule of Company's Warranty Accrual

The activity in the Company’s warranty liability as of December 31 was as follows:


		2015				2014
Balance at beginning of year		$	3,094			$	1,274
Acquisitions			631				1,600
Charged to expense			428				2,020
Payments			(1,726	)			(1,800	)

Balance at end of year		$	2,427			$	3,094

Schedule of Other Accrued Liabilities

Other accrued liabilities consisted of the following as of December 31:


		2015				2014
Due to former owners		$	8,788			$	—
Warranty			2,427				3,094
Customer deposits			3,606				385
Other			4,354				3,263

Balance at end of year		$	19,175			$	6,742