v3.19.2
Cash and cash equivalents and marketable securities
 6 Months Ended
Jun. 30, 2019
Cash and cash equivalents and marketable securities  
Cash and cash equivalents and marketable securities

4. Cash and cash equivalents and marketable securities

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Cash and cash equivalents and marketable securities consisted of the following:

                                                                                                                                                                                    

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June 30, 

    

December 31, 

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2019

​

2018

Cash and cash equivalents:

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​

​

​

​

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Cash

​

$

4,398

​

$

11,689

Money market accounts

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22,983

​

 

137,723

Total cash and cash equivalents

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$

27,381

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$

149,412

Short-term marketable securities-available-for-sale:

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​

​

​

​

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Marketable securities

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$

42,799

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$

—

Total short-term marketable securities

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$

42,799

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$

—

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All contractual maturities of marketable securities were less than one year at June 30, 2019. Marketable securities consist primarily of debt securities which include commercial paper and debt instruments including notes issued by foreign or domestic industrial and financial corporations and governments which pay in U.S. dollars and carry a rating of A or better. For the three months and six months ended June 30, 2019, interest income was $540 and $1,254, respectively. For the three and six months ended June 30, 2018, interest income was $11 and $19, respectively. Interest income is included in interest and other expense, net in the accompanying condensed consolidated statements of operations.