Cash, cash equivalents, restricted cash and available-for-sale marketable securities (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Amortized Cost
Cash and cash equivalents	$ 144,321	$ 86,042
Marketable securities, amortized cost	86,295	196,687
Total money market funds and marketable securities	224,050	274,990
Fair Value
Marketable securities, fair value	86,771	197,411
Total money market funds and marketable securities	224,526	275,714
Unrealized Gains and Losses
Marketable securities, unrealized gains	475	752
Total money market funds and marketable securities	$ 475	752
Marketable securities, unrealized losses		28
Total money market funds and marketable securities		28
Maximum
Unrealized Gains and Losses
Debt securities, contractual maturity period	1 year
Money market funds
Amortized Cost
Cash and cash equivalents	$ 137,755	78,303
U.S. Treasury notes
Amortized Cost
Marketable securities, amortized cost	85,075	195,467
Fair Value
Marketable securities, fair value	85,349	195,491
Unrealized Gains and Losses
Marketable securities, unrealized gains	273	52
Marketable securities, unrealized losses		28
Equity securities
Amortized Cost
Marketable securities, amortized cost	1,220	1,220
Fair Value
Marketable securities, fair value	1,422	1,920
Unrealized Gains and Losses
Marketable securities, unrealized gains	$ 202	$ 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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