Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30,				Six Months Ended June 30,
	2018		2017		2018		2017

Research and development	$	38,000	$	73,000	$	75,000	$	101,000
General and administrative		86,000		226,000		171,000		369,000
Total stock-based compensation	$	124,000	$	299,000	$	246,000	$	470,000

Summary of Stock Option Activity

Stock option transactions during the six months ended June 30, 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		36,500		1.20
Forfeited/Cancelled		(1,450)		17.46
Outstanding at June 30, 2018		1,150,915	$	3.09		8.53	$	234,000
Vested and expected to vest at June 30, 2018		865,802	$	3.80		8.29	$	172,000
Exercisable at June 30, 2018		174,578	$	11.43		4.67	$	29,000

Shares Reserved for Future Issuance

As of June 30, 2018, the Company had reserved shares of its common stock for future issuance as follows:



	Shares Reserved
Stock options outstanding		1,150,915
Employee stock purchase plan		47,172
Available for future grants under the 2016 Plan		445,376
Warrants outstanding		8,296,995
Total shares reserved		9,940,458