Stock-Based Compensation - Expense (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Stock-Based Compensation
Total stock-based compensation	$ 2.5	$ 2.6
Costs of product revenue
Stock-Based Compensation
Total stock-based compensation	0.4	0.4
Selling, general and administrative
Stock-Based Compensation
Total stock-based compensation	1.7	1.8
Research and development
Stock-Based Compensation
Total stock-based compensation	0.4	0.4
Stock options
Stock-Based Compensation
Total stock-based compensation	1.0	1.7
Restricted stock awards
Stock-Based Compensation
Total stock-based compensation	0.2	0.3
Restricted stock units
Stock-Based Compensation
Total stock-based compensation	$ 1.3	$ 0.6

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
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration