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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
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 March 31, 2018Fair Value Measurements as of December 31, 2017
Description TotalLevel 1Level 2TotalLevel 1Level 2
Money market funds $54,830 $54,830 $— $49,452 $49,452 $— 
U.S. treasury debt securities 3,080 — 3,080 3,075 — 3,075 
U.S. corporate debt securities 12,721 — 12,721 13,289 — 13,289 
$70,631 $54,830 $15,801 $65,816 $49,452 $16,364 
Included in cash and cash equivalents $54,830 $49,452 
Included in marketable securities $15,801 $16,364