Net Loss Per Common Share - Narrative (Details) - 1.75% convertible senior notes due 2020 - Convertible debt - $ / shares |
Mar. 31, 2018 |
Dec. 09, 2015 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Interest rate | 1.75% | 1.75% |
| Debt instrument, conversion price (in dollars per share) | $ 16.42 | $ 16.42 |
| X | ||||||||||
- Definition The price per share of the conversion feature embedded in the debt instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- 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. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|