Organization and Business (Details)					1 Months Ended	12 Months Ended
	May. 18, 2015 USD ($) $ / shares shares	Oct. 27, 2014 shares	Jul. 01, 2013 shares	Jun. 11, 2013 shares	Oct. 31, 2014	Dec. 31, 2015 USD ($) segment shares	Dec. 31, 2014 USD ($) shares	Oct. 26, 2014 shares
Organization and business
Number of segments | segment						1
General and administrative expense						$ 5,339,351	$ 4,095,324
Research and development expense						$ 6,475,851	$ 4,220,338
Reverse Stock Split
Common stock, shares authorized | shares						50,000,000	15,000,000
Initial Public Offering
Net proceeds from initial public offering						$ 18,810,484
Liquidity
Accumulated deficit						$ (25,702,328)	$ (9,410,778)
IPO
Initial Public Offering
Underwriting discounts, commissions, and estimated offering expenses	$ 2,900,000
Non-cash offering expenses	3,300,000
Underwriters' over-allotment option
Initial Public Offering
Underwriting discounts, commissions, and estimated offering expenses	$ 1,200,000
Common Stock
Reverse Stock Split
Reverse stock split ratio		0.667			0.667
Common stock, shares authorized | shares		15,000,000						10,000,000
Initial Public Offering
Shares issued (in shares) | shares						2,860,000
Common Stock | IPO
Initial Public Offering
Shares issued (in shares) | shares	2,860,000
Shares issued (price per share) | $ / shares	$ 7.00
Net proceeds from initial public offering	$ 15,900,000
Underwriting discounts, commissions, and estimated offering expenses						$ 2,897,825
Issuance of common stock upon conversion (in shares) | shares	2,010,596
Common Stock | Underwriters' over-allotment option
Initial Public Offering
Underwriting discounts, commissions, and estimated offering expenses						1,209,802
Service Agreement | Napo
Organization and business
Number of shares issued in exchange for cash and services | shares			2,666,666	2,666,666
General and administrative expense						114,858
Research and development expense						$ 28,764