Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Cash Flows [Abstract]        
Cash and cash equivalents $ 54,431 $ 69,022 $ 213,939 $ 111,838
Restricted cash included in Prepaid expenses and other current assets 150 244 0 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 $ 65,370 [1] $ 79,374 [1] $ 223,828 [1] $ 121,727
[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 : December 31, 2018: $54,431, December 31, 2017: $69,022, December 31, 2016: $213,939, December 31, 2015: $111,838 Restricted cash included in Prepaid expenses and other current assets : December 31, 2018: $150, December 31, 2017: $244, December 31, 2016 : $0, December 31, 2015: $0 Restricted cash included in Other long-term assets: December 31, 2018: $10,789, December 31, 2017: $10,108, December 31, 2016 : $9,889, December 31, 2015: $9,889 Total cash, cash equivalents and restricted cash at end of period: December 31, 2018: $65,370, December 31, 2017: $79,374, December 31, 2016 : $223,828, December 31, 2015: $121,727