Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2016

Summary of Significant Accounting Policies [Abstract]

Schedule of Cash and Equivalents

Cash and cash equivalents consist of highly liquid investments with maturities of three months or less from the date of purchase. Cash and cash equivalents consist of the following at (in thousands):

	March 31, 2016		December 31, 2015
Cash	$	7,182	$	29,569
Money market funds		49,321		14,950
Debt securities of U.S. government agencies		9,994		—
Government-backed security		39,500		20,000
Asset-backed securities		—		8,185
Corporate debt securities		26,228		20,404
Cash and cash equivalents	$	132,225	$	93,108