Credit Risk (Tables)

3 Months Ended

Mar. 31, 2017

Receivables [Abstract]

Schedule of changes in the allowance for doubtful accounts

The following table summarizes the changes in the allowance for doubtful accounts during the three months endedMarch 31, 2017(in thousands):

Balance at beginning of period	$	267
Reversed to expense	(60		)
Write-offs, net of amounts recovered	(29		)
Balance at end of period	$	178