Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2017

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,		December 31,
	2017		2016
Cash	$	15,540	$	17,481
Money market funds		51,816		95,896
Government-backed securities		19,000		19,000
Asset-backed securities		3,500		—
Corporate debt securities		5,991		11,976
Cash and cash equivalents	$	95,847	$	144,353