Cash, cash equivalents, restricted cash and available-for-sale marketable securities (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Amortized Cost
Cash and cash equivalents	$ 165,227	$ 86,042	$ 113,261
Marketable securities, amortized cost	86,374	196,687
Total money market funds and marketable securities	239,769	274,990
Fair Value
Marketable securities, fair value	87,136	197,411
Total money market funds and marketable securities	240,531	275,714
Unrealized Gains and Losses
Marketable securities, unrealized gains	762	752
Total money market funds and marketable securities	$ 762	752
Marketable securities, unrealized losses		28
Total money market funds and marketable securities		28
Debt securities, contractual maturity period	1 year
Money market funds
Amortized Cost
Cash and cash equivalents	$ 153,395	78,303
Fair Value
Cash and cash equivalents	153,395	78,303
U.S. Treasury notes
Amortized Cost
Marketable securities, amortized cost	85,154	195,467
Fair Value
Marketable securities, fair value	85,704	195,491
Unrealized Gains and Losses
Marketable securities, unrealized gains	550	52
Marketable securities, unrealized losses		28
Equity securities
Amortized Cost
Marketable securities, amortized cost	1,220	1,220
Fair Value
Marketable securities, fair value	1,432	1,920
Unrealized Gains and Losses
Marketable securities, unrealized gains	$ 212	$ 700

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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