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Stock-Based Compensation (Tables)
 3 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Expense Total stock-based compensation expense recognized in our unaudited condensed consolidated statements of operations and comprehensive loss includes amounts related to stock options and restricted stock and was as follows (in thousands):
 Quarter Ended September 30,Nine Months Ended September 30,
 2021202020212020
Total stock-based compensation expense$2,518 $390 $3,789 $1,093 
Weighted-Average Assumptions Used to Determine Fair Value of Options Granted The fair value of RealNetworks options granted determined using the Black-Scholes model used the following weighted-average assumptions:
 Quarter Ended September 30,Nine Months Ended September 30,
 2021202020212020
Expected dividend yield0 %0 %0 %0 %
Risk-free interest rate0.58 %0.21 %0.56 %0.40 %
Expected life (years)3.94.03.94.0
Volatility71 %45 %71 %45 %