Stockholders' Equity - Additional Information (Details) - Subsequent Event Type [Domain] - USD ($)				1 Months Ended		6 Months Ended
	Apr. 06, 2015	Feb. 10, 2015	Oct. 06, 2014	Apr. 17, 2015	Mar. 19, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Stockholders Equity Note [Line Items]
Stock Issued During Period, Shares, New Issues			1,959,000	88,293
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number						3,176,519		3,237,851
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term						9 years 1 month 6 days
Shares Issued, Price Per Share			$ 8.04
Proceeds From Issuance Initial Public Offering						$ 81,014,989	$ 1,763,104
Stock Issued During Period, Shares, New Issues			1,959,000	88,293
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period						40,666
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period						93,720
2010 Plan
Stockholders Equity Note [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number						80,500
Common Stock, Capital Shares Reserved for Future Issuance						679,292
2014 Plan
Stockholders Equity Note [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number						2,474,368
Common Stock, Capital Shares Reserved for Future Issuance						44,966
Common Stock [Member]
Stockholders Equity Note [Line Items]
Stock Issued During Period, Value, New Issues					$ 70,400,000
Stock Issued During Period, Shares, New Issues					5,555,555
Sale of Stock, Price Per Share					$ 13.50
Shares Issued, Price Per Share					$ 13.50
Stock Issued During Period, Shares, New Issues					5,555,555
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period						40,666
Warrant [Member]
Stockholders Equity Note [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				120,265
Underwritten Public Offering [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Stock Issued During Period, Value, New Issues	$ 10,600,000
Stock Issued During Period, Shares, New Issues	833,333
Shares Issued, Price Per Share	$ 13.50
Proceeds From Issuance Initial Public Offering	$ 81,000,000
Stock Issued During Period, Shares, New Issues	833,333
Underwriters [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Stock Issued During Period, Shares, New Issues					833,333
Stock Issued During Period, Shares, New Issues					833,333
Dr Ellison [Member]
Stockholders Equity Note [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares		266,666
Accelerated Options		266,667