Goodwill and Intangible Assets, Net - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Goodwill and Intangible Assets [Line Items]
Cost	$ 13,544		$ 15,455
Accumulated Amortization	(1,815)		(3,094)
Net Book Value	11,729		12,361
Intangible assets not subject to amortization	40		40
Total intangible assets, net	11,769		12,401
Amortization of intangible assets	600	$ 100
Goodwill	$ 1,549		1,549
Developed technology
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted Average Life (Years)	5 years
Weighted Remaining Average Life (Years)	4 years 6 months 15 days	4 years 9 months 15 days
Cost	$ 12,156		14,067
Accumulated Amortization	(1,068)		(2,371)
Net Book Value	$ 11,088		11,696
Patent licenses
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted Average Life (Years)	14 years
Weighted Remaining Average Life (Years)	6 years 4 months 13 days	6 years 7 months 29 days
Cost	$ 1,388		1,388
Accumulated Amortization	(747)		(723)
Net Book Value	$ 641		$ 665