Net Loss per Share - IPO (Details)	Oct. 04, 2016 $ / shares shares
IPO
Initial Public Offering
Issuance of common stock upon public offering (in shares)	4,300,000
Issuance price (in dollars per share) | $ / shares	$ 12.00
Underwriter option
Initial Public Offering
Issuance of common stock upon public offering (in shares)	645,000