Revenue - Revenue Recognition (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($) subsidiary	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of subsidiaries \| subsidiary	3
Percentage of Gallium	99.99%
Accounts receivable	$ 22,516	$ 22,778
Accrued liabilities	$ 11,793	11,149
Adjustment \| ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable		169
Accrued liabilities		$ 169
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales commissions benefit period	1 year

Period at which sales commissions are expected to be received.

No definition available.

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- Definition

Number of consolidated subsidiaries.

+ References

No definition available.

+ Details

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- Definition

Percentage of Gallium.

+ References

No definition available.

+ Details

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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