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, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for doubtful accounts receivable      
Movement in valuation and qualifying accounts      
Balance at Beginning of Year $ 205 $ 190 $ 849
Provisions 556 305 83
Amounts Written Off (366) (290) (714)
Amounts Recovered 0 0 0
Effect of Currency Translation 0 0 (28)
Balance at End of Year 395 205 190
Allowance for sales returns      
Movement in valuation and qualifying accounts      
Balance at Beginning of Year 156 94 129
Provisions 1,746 1,435 1,126
Amounts Written Off (1,644) (1,368) (1,155)
Amounts Recovered 0 0 0
Effect of Currency Translation 12 (5) (6)
Balance at End of Year 270 156 94
Tax valuation allowance      
Movement in valuation and qualifying accounts      
Balance at Beginning of Year 11,250 6,565 13,169
Provisions 13,786 5,638 (6,088)
Amounts Written Off 0 (493) 0
Amounts Recovered (865) 0 0
Effect of Currency Translation (147) (460) (516)
Balance at End of Year $ 24,024 $ 11,250 $ 6,565