Nature of Operations (Details) - USD ($)		12 Months Ended
	Oct. 06, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Completion of IPO [Abstract]
Sales price per share (in dollars per share)	$ 11.00
Gross proceeds from issuance of common stock	$ 92,500,000	$ 86,059,087	$ 0	$ 0
Net proceeds from issuance of common stock	82,800,000
Underwriting discounts, commissions and other offering costs	$ 9,700,000
Common shares issued upon conversion of preferred stock (in shares)	18,566,856
Preferred stock, shares outstanding (in shares)		0
Common stock, shares authorized (in shares)	75,000,000	75,000,000	35,000,000
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000	17,000,000
Common stock, par value (in dollars per share)	$ 0.00033	$ 0.00033	$ 0.00033
IPO [Member]
Completion of IPO [Abstract]
Shares of common stock sold (in shares)	8,412,423
Over-Allotment Option [Member]
Completion of IPO [Abstract]
Shares of common stock sold (in shares)	1,097,272