Common Stock and Stock Warrants (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Shares Reserved for Future Issuance

Shares reserved for future issuance at December 31, 2017 are as follows:

	Number of Shares
Common stock options outstanding	6,083,482
Common stock options available for future grant:
2014 Equity Incentive Plan	125,000
Amended and Restated 2017 Inducement Equity Incentive Plan	1,850,000
Exercise of common stock warrants outstanding	240,620
Total common shares reserved for future issuance	8,299,102