Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of dilutive securities excluded from computations of diluted weighted average shares outstanding

The following potentially dilutive securities outstanding at the end of the periods presented have been excluded from the computations of diluted shares outstanding because such securities have an antidilutive impact due to losses reported:

	Year Ended December 31,
	2018	2017	2016
Convertible preferred stock outstanding	—	12,111,706	9,367,628
Convertible preferred stock warrants	—	423,784	394,587
Convertible common stock warrants	6,595	—	—
Common stock options outstanding	2,745,156	2,071,616	1,497,511
Total	2,751,751	14,607,106	11,259,726