Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares

Potential common stock equivalents excluded from the calculation of diluted earnings per share because the effect would have been anti-dilutive were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Stock options		10,612,258		7,984,469		10,612,258		7,984,469
ESPP		54,895		—		54,895		—
Warrants		486,812		486,812		486,812		486,812
Restricted stock units		812,347		1,395,829		812,347		1,395,829
Performance stock units		56,666		466,668		56,666		466,668
Deferred stock units		—		35,418		—		35,418
		12,022,978		10,369,196		12,022,978		10,369,196