Accounts Receivable

3 Months Ended

Mar. 31, 2012

Notes to Financial Statements [Abstract]

Accounts Receivable

5.  Accounts Receivable

	March 31, 2012		December 31, 2011
Royalties	$	1,835	$	1,279
Collaborators		480		77
Research grants		74		100
Other		14		60
Total	$	2,403	$	1,516

The increase in accounts receivable as of March 31, 2012 as compared to December 31, 2011, is primarily due to higher Relistor sales during the first quarter of 2012. In addition, during the first quarter we collected substantially all of our December 31, 2011 accounts receivable balances.