Common Stock Reserved for Future Issuance (Details) - shares	Jun. 30, 2017	Jun. 30, 2016
Stockholders' equity
Shares reserved for future issuance (in shares)	4,218,016	3,493,157
Common stock warrants
Stockholders' equity
Shares reserved for future issuance (in shares)	24,566	24,566
Stock options
Stockholders' equity
Shares reserved for future issuance (in shares)	3,669,791	3,133,107
Employee Stock Purchase Plan
Stockholders' equity
Shares reserved for future issuance (in shares)	523,659	335,484