XML 52 R35.htm IDEA: XBRL DOCUMENT v3.10.0.1
Nature of operations - Additional Information (Details) - Initial Public Offering
$ / shares in Units, $ in Millions
Sep. 27, 2016
USD ($)
$ / shares
shares
Nature of Operations [Line Items]  
Common stock issued including underwriter's overallotment option (in shares) 9,583,333
Initial offering price (in USD per share) | $ / shares $ 17.00
Gross proceeds from issuance of initial public offering | $ $ 162.9
Net proceeds excluding underwriting discounts and commissions and other offering expenses including offering expenses paid prior to the initial public offering | $ $ 54.9
Conversion of preferred stock into common stock (in shares) 37,271,375
Existing Stockholders  
Nature of Operations [Line Items]  
Common stock issued including underwriter's overallotment option (in shares) 5,583,333