Subsequent Events - Additional Information (Details) - Subsequent Event - USD ($)	May 01, 2017	Apr. 21, 2017
Subsequent Event [Line Items]
Maximum aggregate offering price	$ 150,000,000
At The Market Sales Agreement | JonesTrading Institutional Services LLC
Subsequent Event [Line Items]
Maximum aggregate offering price of common stock	$ 20,000,000
interim CMO
Subsequent Event [Line Items]
Salary per month		$ 27,000
Option to purchase common stock, subject to service condition		24,000