Organization and Nature of Business - Additional Information (Details) $ / shares in Units, $ in Millions		9 Months Ended
	Apr. 20, 2015 USD ($) $ / shares shares	Sep. 30, 2016 Segment Platform shares	Dec. 31, 2015 shares
Organization And Nature Of Business [Line Items]
Number of business segments | Segment		1
Number of technology platforms developed | Platform		3
Preferred stock shares authorized	10,000,000	10,000,000	10,000,000
Common stock shares authorized	300,000,000	300,000,000	300,000,000
Common Stock | IPO
Organization And Nature Of Business [Line Items]
Issuance of common stock (in shares)	8,050,000
Stock price per share | $ / shares	$ 17.00
Proceeds from IPO net of underwriting discount, commission and offering expenses | $	$ 124.2
Number of common stock issued on conversion of convertible preferred stock	51,822,659
Common Stock | Exercise of Underwriters
Organization And Nature Of Business [Line Items]
Issuance of common stock (in shares)	1,050,000
Novartis Agreement | Common Stock | Private Placement
Organization And Nature Of Business [Line Items]
Issuance of common stock (in shares)	1,470,588
Stock price per share | $ / shares	$ 17.00
Issuance of common stock | $	$ 25.0