Goodwill and Intangible Assets, Net - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Schedule of Goodwill and Intangible Assets [Line Items]
Cost	$ 8,454		$ 8,454		$ 3,298
Accumulated Amortization	(2,693)		(2,693)		(2,351)
Net Book Value	5,761		5,761		947
Intangible assets not subject to amortization	40		40		40
Total intangible assets, net	5,801		5,801		987
Amortization of intangible assets	200	$ 100	400	$ 300
Goodwill	900		900		317
Existing technology
Schedule of Goodwill and Intangible Assets [Line Items]
Cost	7,066		7,066		1,910
Accumulated Amortization	(1,996)		(1,996)		(1,728)
Net Book Value	5,070		5,070		182
Patent license
Schedule of Goodwill and Intangible Assets [Line Items]
Cost	1,388		1,388		1,388
Accumulated Amortization	(697)		(697)		(623)
Net Book Value	$ 691		$ 691		$ 765