Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2012

Accounts Receivable [Abstract]

Accounts Receivable

5.  Accounts Receivable

	June 30, 2012		December 31, 2011
Royalties	$	1,619	$	1,279
Collaborators		386		77
Research grants		77		100
Other		14		60
Total	$	2,096	$	1,516

The increase in accounts receivable as of June 30, 2012 as compared to December 31, 2011, is primarily due to higher Relistor royalties from increased net sales by Salix during the second quarter of 2012. Since December 31, 2011, we have collected all accounts receivable outstanding on that date.