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
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]        
Cash and cash equivalents $ 46,044 $ 69,022 $ 73,553 $ 213,939
Restricted cash included in Prepaid expenses and other current assets 150 244 385 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 $ 56,983 [1] $ 79,374 $ 83,827 [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.Cash and cash equivalents : September 30, 2018: $46,044, December 31, 2017: $69,022, September 30, 2017: $73,553, December 31, 2016: $213,939 Restricted cash included in Prepaid expenses and other current assets : September 30, 2018: $150, December 31, 2017: $244, September 30, 2017 : $385, December 31, 2016: $0 Restricted cash included in Other long-term assets: September 30, 2018: $10,789, December 31, 2017: $10,108, September 30, 2017 : $9,889, December 31, 2016: $9,889 Total cash, cash equivalents and restricted cash at end of period: September 30, 2018: $56,983, December 31, 2017: $79,374, September 30, 2017 : $83,827, December 31, 2016: $223,828