Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Total Stock-Based Compensation Expense

Total stock-based compensation expense was allocated to research and development, manufacturing and production and general and administrative expense as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
Research and development	$	77	$	105	$	159	$	216
Manufacturing and production		30		47		63		81
General and administrative		171		374		369		800
Total stock-based compensation expense	$	278	$	526	$	591	$	1,097