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Fair Value Measurement (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table summarizes the financial instruments measured at fair value on a recurring basis classified in the fair value hierarchy (Level 1, 2 or 3) based on the inputs used for valuation in the accompanying unaudited condensed consolidated balance sheets:
 
 
As of June 30, 2019
 
As of December 31, 2018
Fair Value Measurements:
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
 
 
 
 
 
 
 
 
 
 
 
 
 
Marketable securities (see Note 6)
 
 
 
 
 
 
 
 
 
 
 
 
Equity securities
 
$
4,038

 
$
—

 
$
—

 
$
9,145

 
$
—

 
$
—

Money market funds
 
47,033

 
—

 
—

 
52,996

 
—

 
—

Corporate bonds
 
—

 
3,664

 
—

 
—

 
6,339

 
—

Government securities - U.S.
 
—

 
5,234

 
—

 
—

 
12,701

 
—

Other fixed-income securities
 
—

 
2,182

 
—

 
—

 
9,409

 
—

Total assets
 
$
51,071

 
$
11,080

 
$
—

 
$
62,141

 
$
28,449

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
Related party payable (see Note 10)
 
$
—

 
$
—

 
$
24,247

 
$
—

 
$
—

 
$
28,840

Total liabilities
 
$
—

 
$
—

 
$
24,247

 
$
—

 
$
—

 
$
28,840