Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Schedule of Outstanding Potentially Dilutive Securities Excluded in the Calculation of Diluted Net Loss Per Share

The following table sets forth the outstanding potentially dilutive securities that have been excluded in the calculation of diluted net loss per share because to do so would be anti-dilutive (in common stock equivalent shares):

	Three Months Ended March 31,
(in thousands)	2017	2016
Convertible preferred stock	—	11,521
Options to purchase common stock	1,995	2,027
Warrants to purchase preferred stock	—	294
Warrants to purchase common stock	332	117
Total	2,327	13,959