Schedule II - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts and returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 307	$ 52	$ 219
Charges to Revenue/ Expense	39	582	(6)
Deductions	191	327	161
Ending Balance	155	307	52
Reserve for excess, obsolete, and slow moving inventories
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	305	158	613
Charges to Revenue/ Expense	1,464	194	146
Deductions	347	47	601
Ending Balance	1,422	305	158
Valuation allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	9,008	6,051	27,496
Charges to Revenue/ Expense	(1,240)	2,957	(21,445)
Deductions	0	0	0
Ending Balance	$ 7,768	$ 9,008	$ 6,051