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Supplemental Consolidated Balance Sheet and Statement of Operations Information - Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Nonoperating Income (Expense) [Abstract]
Interest income									$ 586	$ 286	$ 151
Recognition of IEDA government grant									0	0	1,638
Income from training reimbursement program									1,578	1,141	744
(Losses) gains on foreign currency transactions									(372)	67	(293)
Other									(9)	6	62
Nonoperating Income (Expense)	$ 797	$ 198	$ 176	$ 612	$ 348	$ 298	$ 278	$ 576	$ 1,783	$ 1,500	$ 2,302

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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