Investments (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Feb. 28, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments, All Other Investments [Abstract]
Technology licenses and consulting services purchased	$ 3,500	$ 0	$ 0	$ 3,451
Intangible assets		2,000		$ 2,800
Intangible assets written off due to impairment of investment		$ 600

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Name:	us-gaap_PaymentsToAcquireIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration