Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Underwritten Public Offering (Details)

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Stockholders' Equity - Underwritten Public Offering (Details)
$ / shares in Units, $ in Millions
1 Months Ended
Feb. 28, 2018
USD ($)
$ / shares
shares
Class of Stock [Line Items]  
Price per share sold (in dollars per share) | $ / shares $ 8.00
Stock offering costs | $ $ 0.4
Public Stock Offering  
Class of Stock [Line Items]  
Shares sold in offering (in shares) | shares 6,325,000
Net proceeds from stock offering | $ $ 47.6
Over-Allotment Option  
Class of Stock [Line Items]  
Shares sold in offering (in shares) | shares 825,000