Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of employee stock-based compensation expense

The stock-based compensation expense recorded for the three and nine months ended September 30, 2018 and 2017, is as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Research and development	$	29	$	85	$	87	$	269
Selling, general and administrative		326		861		3,003		2,549
Total stock-based compensation expense	$	355	$	946	$	3,090	$	2,818

Schedule of outstanding potentially dilutive securities calculation of diluted loss per share attributable to common stockholders

The following table sets forth the outstanding potentially dilutive securities that have been excluded in the calculation of diluted loss per share attributable to common stockholders (in common stock equivalent shares):

	September 30,
	2018		2017
Common stock purchase warrants		11,714,940		829,285
Restricted stock units		172,912		344,982
Common stock options		1,725,771		1,558,800
Total		13,613,623		2,733,067