Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Underwritten Public Offering (Details)

v3.8.0.1
Subsequent Events - Underwritten Public Offering (Details) - Subsequent Event
$ / shares in Units, $ in Millions
1 Months Ended
Feb. 28, 2018
USD ($)
$ / shares
shares
Subsidiary, Sale of Stock [Line Items]  
Price per share sold (in dollars per share) | $ / shares $ 8.00
Stock offering costs | $ $ 0.3
Public Stock Offering  
Subsidiary, Sale of Stock [Line Items]  
Shares sold in offering (in shares) | shares 6,325,000
Net proceeds from stock offering | $ $ 47.6
Over-Allotment Option  
Subsidiary, Sale of Stock [Line Items]  
Shares sold in offering (in shares) | shares 825,000