Summary of Significant Accounting Policies - Accounts Receivable, net (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Accounts Receivable, net
Allowance for expected sales discounts	$ 8.1	$ 5.6
7.50% Convertible Senior Secured Notes due 2019
Deferred Financing Costs
Interest rate (as a percent)	7.50%

Contractual interest rate for funds borrowed, under the debt agreement.

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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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