Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Reserved Shares of Common Stock for Future Issuance

The Company had reserved shares of common stock for future issuance as follows: 

	December 31,
	2018	2017
Outstanding stock options	1,671,666	1,399,484
Warrants to purchase common stock issued in January 2018 Offering	10,000,000	—
For possible future issuance under 2016 Stock Plan (Note 10)	699,376	1,023,378
	12,371,042	2,422,862