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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the changes in each component of accumulated other comprehensive loss, net of tax, for 2020:

 
 
Unrealized gains (losses) on short-term investments
 
Total
Balance at December 31, 2019
 
$
(27
)
 
$
(27
)
Other comprehensive income (loss) before reclassifications
 
10

 
10

Net current period other comprehensive loss
 
10

 
10

Balance at March 31, 2020
 
$
(17
)
 
$
(17
)