Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Cash Flows (Parenthetical)

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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]        
Cash and cash equivalents $ 63,516 $ 69,022 $ 42,738 $ 213,939
Restricted cash included in Prepaid expenses and other current assets 150 244 432 0
Restricted cash included in Other long-term assets 10,789 10,108 9,889 9,889
Cash, cash equivalents and restricted cash at end of period $ 74,455 [1] $ 79,374 $ 53,059 [1] $ 223,828
[1] The following table reconciles cash, cash equivalents and restricted cash per the statement of cash flows to the balance sheet. The restricted cash balances are primarily due to letters of credit which have been issued to the landlords of leased office space. The terms of the letters of credit primarily extend beyond one year. June 30, 2018 December 31, 2017 June 30, 2017 December 31, 2016Cash and cash equivalents$63,516 $69,022 $42,738 $213,939Restricted cash included in Prepaid expenses and other current assets150 244 432 —Restricted cash included in Other long-term assets10,789 10,108 9,889 9,889Total cash, cash equivalents and restricted cash at end of period$74,455 $79,374 $53,059 $223,828