Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Summary of Significant Accounting Policies

Schedule of cash and cash equivalents

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

	December 31,
	2016		2015
Cash	$	1,173	$	776
Money market fund		22,423		62,004
Total	$	23,596	$	62,780

Schedule of stock-based compensation expense

        During the years ended December 31, 2016, 2015 and 2014, 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,
	2016		2015		2014
Research and development	$	723	$	681	$	434
General and administrative		1,437		977		463
Total	$	2,160	$	1,658	$	897

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

	Year Ended December 31,
	2016		2015		2014
Convertible preferred stock		—		—		8,012,988
Stock options		2,270,169		1,723,554		1,226,140
Common stock warrants		24,566		59,405		34,839
Preferred stock warrants		—		—		12,283
		2,294,735		1,782,959		9,286,250