Supplemental Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2014

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

	March 31, 2014		December 31, 2013
Prepaid clinical, manufacturing, and scientific costs	$	5,957	$	3,960
Interest receivable		828		859
Prepaid insurance		923		958
Other		1,217		840
	$	8,925	$	6,617

Summary of Other Non-Current Assets

Other non-current assets consist of the following:

	March 31, 2014		December 31, 2013
Restricted cash	$	2,151	$	1,935
Other		80		52
	$	2,231	$	1,987

Accrued Expenses

Accrued expenses consist of the following:

	March 31, 2014		December 31, 2013
Accrued compensation and benefits	$	2,760	$	3,244
Clinical, manufacturing and scientific costs		7,399		6,587
Professional fees		1,011		568
Accrued capital expenditures		1,592		—
Other		1,167		722
	$	13,929	$	11,121