Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

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, 2018		December 31, 2017
Cash	$	13,448	$	10,482
Money market funds		31,056		36,762
Asset-backed securities		18,750		16,007
Corporate debt securities		50,148		43,056
Cash and cash equivalents	$	113,402	$	106,307

Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statement of cash flows (in thousands):

	March 31, 2018		December 31, 2017
Cash and cash equivalents	$	113,402	$	106,307
Restricted cash current		19,548		28,234
Restricted cash non-current		891		890
Cash, cash equivalents and restricted cash	$	133,841	$	135,431