Nature of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 06, 2015	Mar. 31, 2017	Dec. 31, 2016
Completion of IPO [Abstract]
Common stock, par value (in dollars per share)	$ 0.00033	$ 0.00033	$ 0.00033
Gross proceeds from issuance of common stock	$ 92.5
Net proceeds from issuance of common stock	$ 82.8
Common Stock issued upon conversion of preferred stock (in shares)	18,566,856
IPO [Member]
Completion of IPO [Abstract]
Shares of common stock sold (in shares)	8,412,423
Sales price per share (in dollars per share)	$ 11.00