Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Significant Accounting Policies

Schedule of cash and cash equivalents

Cash and cash equivalents consist of the following (in thousands):

	December 31,
	2018		2017
Cash	$	4,390	$	2,781
Money market fund		5,956		13,588
Corporate debt securities		1,948		—
Reverse repurchase agreements		3,000		—
Total	$	15,294	$	16,369

Schedule of reconciliation of cash, cash equivalents and restricted cash

	December 31,
	2018		2017
Cash and cash equivalents	$	15,294	$	16,369
Restricted cash		113		113
Total	$	15,407	$	16,482

Schedule of stock-based compensation expense

During the years ended December 31, 2018 and 2017, the Company recorded stock-based compensation expense for employee and non-employee stock options and restricted stock, which was allocated as follows in the statements of operations (in thousands): 

	Year Ended December 31,
	2018		2017
Research and development	$	673	$	784
General and administrative		1,098		1,223
Total	$	1,771	$	2,007

Schedule of anti-dilutive common stock equivalents excluded from calculation of diluted net loss per share

	Year Ended December 31,
	2018	2017
Stock options	433,389	283,277
Common stock warrants	4,202,449	2,454
	4,635,838	285,731