Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 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 (in thousands):

	June 30, 2018		December 31, 2017
Cash	$	3,873	$	10,482
Money market funds		35,555		36,762
Asset-backed securities		30,500		16,007
Corporate debt securities		18,547		43,056
Cash and cash equivalents	$	88,475	$	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):

	June 30, 2018		December 31,  2017
Cash and cash equivalents	$	88,475	$	106,307
Restricted cash current		10,132		28,234
Restricted cash non-current		952		890
Cash, cash equivalents and restricted cash	$	99,559	$	135,431