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Short-term Investments
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Short-term Investments Short-term Investments
Short-term investments consisted of available-for-sale and equity securities as follows (in thousands):
Type of securities as of March 31, 2021Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair value
Corporate debt securities$11,946 $6 $— $11,952 
Asset-backed securities1,461 3 — 1,464 
Total available-for-sale debt securities$13,407 $9 $— $13,416 
Type of securities as of December 31, 2020Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair value
Corporate debt securities$22,338 $71 $— $22,409 
U.S. government-related debt securities5,000 3 — 5,003 
Asset-backed securities1,462 9 — 1,471 
Total available-for-sale debt securities$28,800 $83 $— $28,883 
The fair values of available-for-sale debt securities by contractual maturity were as follows (in thousands):
March 31, 2021December 31, 2020
Maturing in one year or less$13,416 $28,883 
Total available-for-sale debt securities$13,416 $28,883