Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Preferred Stock (Details)

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Stockholders' Equity - Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2017
Jun. 30, 2018
Series A Preferred Stock          
Class of Stock [Line Items]          
Value of shares redeemed       $ 13.8  
Number of shares redeemed (in shares)       83,502  
Reduction in the original recorded value of preferred stock       $ 8.4  
Reduction in the accretive value of the preferred stock       $ 5.4  
Series A-1 Preferred Stock          
Class of Stock [Line Items]          
Value of shares redeemed   $ 19.9      
Number of shares redeemed (in shares)   153,000      
Reduction in the original recorded value of preferred stock   $ 15.3      
Reduction in the accretive value of the preferred stock   4.6      
Issuance costs   $ 1.0      
Deemed dividend     $ 4.6    
Private Placement | Soryn HLDR | Series A-1 Preferred Stock          
Class of Stock [Line Items]          
Shares issued (in shares) 153,000        
Price per share (in dollars per share)         $ 100.00
Proceeds from private placement $ 15.3