Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts Receivable:
Allowance for Doubtful Accounts Receivable, beginning balance	$ 366	$ 83
Allowance for Doubtful Accounts Receivable, charged to operations	42	312
Allowance for Doubtful Accounts Receivable, credited to operations	(295)	(25)
Allowance for Doubtful Accounts Receivable, written off	0	0
Allowance for Doubtful Accounts Receivable, effect of exchange rate changes	(11)	(4)
Allowance for Doubtful Accounts Receivable, ending balance	102	366
Inventory reserve:
Inventory reserve, beginning balance	826	85
Inventory reserve, charged to operations	60	2,614
Inventory reserve, credited to operations	(458)	(1,869)
Inventory reserve, written off	0	0
Inventory reserve, effect of exchange rate changes	(29)	(4)
Inventory reserve, ending balance	399	826
Deferred Tax Valuation Allowance:
Deferred tax valuation allowance, beginning balance	1,703	0
Deferred tax valuation allowance, charged to operations	0	1,703
Deferred tax valuation allowance, charged to additional paid-in capital and other comprehensive income	0	0
Deferred tax valuation allowance, creditied to additional paid-in capital and other comprehensive income	(225)	0
Deferred tax valuation allowance, other adjustments	0	0
Deferred tax valuation allowance, ending balance	$ 1,478	$ 1,703