Note 10 - Stock-based Compensation

3 Months Ended

Mar. 31, 2018

Notes to Financial Statements

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

10.

Stock-Based Compensation

The Company records stock-based compensation expense during the requisite service period for share-based payment awards granted to employees and non-employees.

The following table sets forth the Company’s stock-based compensation expense (in thousands) for the periods indicated.

	Three Months Ended March 31,
	2018		2017
Stock options and employee stock purchase plan awards
Research and development	$	9	$	9
Selling, general and administrative		30		30
Restricted stock awards
Research and development		—		12
Selling, general and administrative		—		17
Restricted stock units
Research and development		17		18
Selling, general and administrative		41		42
Total stock-based compensation	$	97	$	128