Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Common Share - Narrative (Details)

v3.7.0.1
Net Loss Per Common Share - Narrative (Details) - $ / shares
Jun. 30, 2017
Jun. 09, 2017
Dec. 09, 2015
1.75% convertible senior notes due 2020 | Convertible debt      
Debt Instrument [Line Items]      
Interest rate 1.75%   1.75%
Debt instrument, conversion price (in dollars per share)     $ 16.42
Series A convertible preferred stock      
Debt Instrument [Line Items]      
Agreement to sell shares (in shares) 480,000 480,000  
Debt instrument, conversion price (in dollars per share) $ 10.50 $ 10.50  
Initial closing | Series A convertible preferred stock      
Debt Instrument [Line Items]      
Agreement to sell shares (in shares) 172,500