Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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.

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No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Stock-Based Compensation - Plan Information and Expense (Details) - USD ($) $ in Millions		3 Months Ended
	May 14, 2010	Mar. 31, 2017	Mar. 31, 2016
Stock-Based Compensation
Total stock-based compensation		$ 2.6	$ 2.2
Cost of revenues
Stock-Based Compensation
Total stock-based compensation		0.4	0.3
Selling, general and administrative
Stock-Based Compensation
Total stock-based compensation		1.8	1.6
Research and development
Stock-Based Compensation
Total stock-based compensation		$ 0.4	0.3
2010 Plan
Stock-Based Compensation
Common stock authorized for issuance (in shares)	8,000,000	0
2010 Plan \| Minimum
Stock-Based Compensation
Vesting period	3 years
2010 Plan \| Maximum
Stock-Based Compensation
Vesting period	5 years
2016 Plan
Stock-Based Compensation
Common stock authorized for issuance (in shares)		9,500,000
2016 Plan \| Minimum
Stock-Based Compensation
Vesting period		1 year
2016 Plan \| Maximum
Stock-Based Compensation
Vesting period		4 years
Stock options
Stock-Based Compensation
Total stock-based compensation		$ 1.7	1.8
Stock options \| Minimum
Stock-Based Compensation
Vesting period		3 years
Stock options \| Maximum
Stock-Based Compensation
Vesting period		4 years
Restricted stock awards
Stock-Based Compensation
Total stock-based compensation		$ 0.3	$ 0.4
Restricted stock units
Stock-Based Compensation
Total stock-based compensation		$ 0.6