Basis of Presentation - Additional information (Details) - Laser Quantum	Jan. 10, 2017	Jan. 09, 2017	Mar. 31, 2017
Basis Of Presentation [Line Items]
Equity method investment ownership percentage on Laser Quantum	76.00%	41.00%
Percentage of additional shares acquired	35.00%		35.00%

Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant