Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

Summary of Significant Accounting Policies

Schedule of stock-based compensation expense

During the three months ended March 31, 2019 and 2018, the Company recorded stock-based compensation expense for employee and non-employee stock options, which was allocated as follows in the condensed consolidated statements of operations (in thousands):

	Three Months Ended March 31,
	2019		2018
Research and development	$	135	$	173
General and administrative		273		306
Total	$	408	$	479

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

	Three Months Ended March 31,
	2019	2018
Stock options	758,304	377,563
Common stock warrants	6,201,949	2,454
	6,960,253	380,017

Schedule of reconciliation of cash, cash equivalents and restricted cash

	March 31,
	2019		2018
Cash and cash equivalents	$	11,652	$	17,030
Restricted cash		113		113
Total	$	11,765	$	17,143