Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

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 December 31 (in thousands):

	2018		2017
Cash	$	6,750	$	10,482
Money market funds		39,168		36,762
Asset-backed securities		15,000		16,007
Corporate debt securities		9,236		43,056
Cash and cash equivalents	$	70,154	$	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 at December 31 (in thousands):

	2018		2017
Cash and cash equivalents	$	70,154	$	106,307
Restricted cash current		10,847		28,234
Restricted cash non-current		958		890
Cash, cash equivalents and restricted cash	$	81,959	$	135,431