Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Summary of Significant Accounting Policies

Schedule of stock-based compensation expense

During the three and nine months ended September 30, 2018 and 2017, 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 September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Research and development	$	168	$	198	$	505	$	595
General and administrative	248		317		835		906
Total	$	416	$	515	$	1,340	$	1,501

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

	Three Months Ended September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Stock options	4,489,457	2,839,407	4,489,457	2,839,407
Common stock warrants	42,024,566	24,566	42,024,566	24,566
	46,514,023	2,863,973	46,514,023	2,863,973

Schedule of reconciliation of cash, cash equivalents and restricted cash

	September 30,
	2018		2017
Cash and cash equivalents	$	19,876	$	21,713
Restricted cash	113		113
Total	$	19,989	$	21,826