Annual report pursuant to Section 13 and 15(d)

Schedule II--Valuation and Qualifying Accounts (Details)

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Schedule II--Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowances for accounts receivable      
Valuation and qualifying accounts      
Beginning Balance $ 1,668 $ 1,819 $ 1,429
Charged to Cost and Expense 644   189
Charged to Cost and Expense   (181)  
Deductions 19 (30) (201)
Ending Balance 2,293 1,668 1,819
Reserve for inventory obsolescence      
Valuation and qualifying accounts      
Beginning Balance 16 10 16
Charged to Cost and Expense 3 13 6
Deductions 4 7 12
Ending Balance $ 15 $ 16 $ 10