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Cash and cash equivalents and marketable securities (Tables)
9 Months Ended
Sep. 30, 2019
Cash and cash equivalents and marketable securities  
Schedule of cash and cash equivalents and marketable securities

    

September 30, 

    

December 31, 

2019

2018

Cash and cash equivalents:

Cash 

$

4,391

$

11,689

Money market accounts 

 

45,791

 

137,723

Total cash and cash equivalents 

$

50,182

$

149,412

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

Marketable securities

$

36,594

$

Total short-term marketable securities

$

36,594

$