Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes Textual [Abstract]
Transition tax on accumulated foreign earnings, amount	$ 547
Mandatory repatriation of foreign earnings	547	$ 0	$ 0
Revaluation of deferred income taxes from U.S. tax reform	11,806	0	0
Deferred tax assets, valuation allowance	1,458	1,753
Federal net operating loss carryforwards	18,854
State net operating loss carryforwards	3,150
Undistributed foreign earnings	3,608
Tax contingency	2,278	2,230
Unrecognized tax benefits	2,278	2,230	$ 1,265
Unrecognized tax benefits that would impact effective tax rate	1,323
HzO, Inc
Income Taxes Textual [Abstract]
Deferred tax assets, valuation allowance	1,007	1,483
Tax year 2012-2014
Income Taxes Textual [Abstract]
Increase taxable income	231
Research and development expense	21
Tax Year 2015
Income Taxes Textual [Abstract]
Bad debt reserve for tax purposes	11,948
Capital Loss Carryforward
Income Taxes Textual [Abstract]
Tax credit carryforward, valuation allowance	184	$ 271
Research Tax Credit Carryforward
Income Taxes Textual [Abstract]
Tax credit carryforward, valuation allowance	$ 267