Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of allowance for doubtful accounts

Activity within the Company’s allowance for doubtful accounts for the periods presented is as follows:

	2018			2017			2016
Beginning balance	$	2,852		$	3,477		$	3,534
Additions	657			674			872
Deductions (write-offs/recoveries) from reserve	(824		)	(1,299		)	(929		)
Ending balance	$	2,685		$	2,852		$	3,477

Summary of product warranty activity

The following table summarizes product warranty activity during 2018 and 2017:

	2018			2017
Beginning balance	$	2,074		$	2,280
Charges to expense	2,060			1,042
Costs incurred	(2,218		)	(1,248		)
Ending balance	$	1,916		$	2,074

Revenue and related development costs, customer-funded research and development costs

Revenue and related development costs from customer-funded research and development are as follows:

	Year Ended December 31,
	2018		2017		2016
Customer-funded service sales	$	4,563	$	2,621	$	1,400
Customer-funded costs included in costs of service sales	3,087		1,510		498

Schedule of reconciliation of basic and diluted weighted average common shares outstanding

A reconciliation of the basic and diluted weighted average common shares outstanding is as follows:

	2018	2017	2016
Weighted average common shares outstanding—basic	17,072	16,419	15,834
Dilutive common shares issuable in connection with stock plans	—	—	—
Weighted average common shares outstanding—diluted	17,072	16,419	15,834