Annual report pursuant to Section 13 and 15(d)

Subsequent Events - ATM Program (Details)

v3.8.0.1
Subsequent Events - ATM Program (Details) - At-the-Market Program - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 12 Months Ended
Oct. 13, 2017
Feb. 20, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Sale of stock, number of shares issued in transaction (in shares) 121,875   544,075
Sale of stock (in dollars per share)     $ 13.04
Gross proceeds from issuance of common stock     $ 7.1
Subsequent Event      
Subsequent Event [Line Items]      
Sale of stock, number of shares issued in transaction (in shares)   96,590  
Sale of stock (in dollars per share)   $ 13.19  
Gross proceeds from issuance of common stock   $ 1.3