Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

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):

	September 30,		December 31,
	2017		2016
Cash	$	14,141	$	17,481
Money market funds		36,047		95,896
Asset-backed securities		14,000		19,000
Corporate debt securities		40,057		11,976
Cash and cash equivalents	$	104,245	$	144,353