Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Stock-Based Compensation [Abstract]

Allocation of Stock-Based Compensation Expenses

The table below summarizes the total stock-based compensation expense included in the Company’s consolidated statements of operations for the periods presented:

	Three Months Ended March 31,
	2018		2017
Research and development	$	37,000	$	28,000
General and administrative		85,000		143,000
Total stock-based compensation	$	122,000	$	171,000

Summary of Stock Option Activity

Stock option transactions during the three months ended March 31, 2018 are presented below:

					Weighted
					Average
			Weighted		Remaining
			Average		Contractual		Aggregate
			Exercise		Term		Intrinsic
	Shares		Price		(Years)		Value
Outstanding at December 31, 2017		1,115,865	$	3.17		8.98	$
Granted		1,500		1.23
Forfeited/Cancelled		(1,322)		17.42
Outstanding at March 31, 2018		1,116,043	$	3.15		8.74	$	196,000
Vested and expected to vest at March 31, 2018		830,930	$	3.92		8.47	$	144,000
Exercisable at March 31, 2018		146,162	$	12.94		4.11	$	18,000

Shares Reserved for Future Issuance

As of March 31, 2018, the Company had reserved shares of its common stock for future issuance as follows:

	Shares Reserved
Stock options outstanding		1,116,043
Employee stock purchase plan		51,016
Available for future grants under the 2016 Plan		480,248
Warrants outstanding		8,304,032
Total shares reserved		9,951,339