Organization and Operations - Liquidity (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	9 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Proceeds from Issuance Initial Public Offering			$ 61,776
Accumulated deficit				$ (135,292)	$ (108,010)
Initial public offering
Stock Issued During Period, Shares, New Issues		5,750,000
Share price (in dollars per share)	$ 12.00	$ 12.00
Proceeds from Issuance Initial Public Offering		$ 61,700
Underwriting discounts, commissions and offering-related expenses payable		$ 7,300
Conversion of convertible preferred stock into common stock (in shares)	9,029,549	9,029,549
Initial public offering | Warrants for the purchase of Common Stock
Number of shares after conversion of issued warrants (in shares)	24,566	24,566
Over-Allotment option for underwriters
Stock Issued During Period, Shares, New Issues		750,000
Preferred Stock | Initial public offering
Preferred Stock warrants converted (in shares)		315,688