Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Warranty Activity

Warranty activity consists of the following (in thousands):

	Three Months Ended March 31,
	2018			2017
Beginning balance	$	2,083		$	1,210
Additions	434			312
Charges	(281		)	(191		)
Ending balance	$	2,236		$	1,331