Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2015

Summary of Significant Accounting Policies [Abstract]

Schedule of Cash and Equivalents

Cash and cash equivalents consist of the following at (in thousands):

	March 31, 2015		December 31, 2014
Cash	$	5,171	$	4,481
Money market funds		156,158		20,354
Government-backed security		18,000		7,500
U.S. agency debt securities		35,721		—
Cash and cash equivalents	$	215,050	$	32,335