Schedule II - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts and returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 155	$ 307	$ 52
Charges to Revenue/ Expense	156	39	582
Deductions	75	191	327
Ending Balance	236	155	307
Reserve for excess, obsolete, and slow moving inventories
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	1,422	305	158
Charges to Revenue/ Expense	3,990	1,464	194
Deductions	176	347	47
Ending Balance	5,236	1,422	305
Valuation allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	7,768	9,008	6,051
Charges to Revenue/ Expense	4,769	(1,240)	2,957
Deductions	0	0	0
Ending Balance	$ 12,537	$ 7,768	$ 9,008

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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- Definition

Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

+ References

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- Definition

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+ References

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