Quarterly report pursuant to Section 13 or 15(d)

Debt - Supplemental Indenture (Details)

v3.8.0.1
Debt - Supplemental Indenture (Details) - $ / shares
May 23, 2017
Sep. 30, 2017
Sep. 20, 2017
Sep. 28, 2016
Debt Instrument [Line Items]        
Indenture, minimum percentage of note holders for waiver 66.67%      
Convertible notes        
Debt Instrument [Line Items]        
Convertible debt conversion price (in dollars per share)   $ 1.364 $ 1.364 $ 1.364