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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured on Recurring Basis The following table presents information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):
  Fair Value Measurements as of September 30, 2017 Fair Value Measurements as of December 31, 2016 
Description  Total  Level 1  Level 2 Total Level 1 Level 2 
Money market funds  $52,027  $52,027  $— $43,496 $43,496 $— 
U.S. treasury debt securities  2,885  —  2,885 3,498 — 3,498 
U.S. corporate debt securities  12,148  —  12,148 7,937 — 7,937 
  $67,060  $52,027  $15,033 $54,931 $43,496 $11,435 
      
Included in cash and cash equivalents  $52,027    $43,496 
Included in marketable securities  $15,033    $11,435