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Noncash Share-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Noncash Share-based Compensation [Abstract]  
Awards outstanding [Table Text Block] The following table presents the number of shares or units outstanding for each award type as of June 30, 2020 and December 31, 2019, respectively, (in thousands): 
Award typeJune 30, 2020December 31, 2019
Restricted stock units (time-based)1,674  1,893  
Restricted stock units (performance-based)190  114  
Stock appreciation rights32  65  
Market stock units157  267  
Schedule of Share-based Compensation Expense The following table summarizes share-based compensation expense included in the Company's unaudited condensed consolidated statements of comprehensive income (loss) for the three and six months ended June 30, 2020 and 2019:
 Three Months Ended June 30,Six Months Ended June 30,
 2020201920202019
Share-based compensation:
Cost of revenue$502  $494  $1,026  $1,032  
Operating expenses:
Selling and marketing1,965  1,414  3,831  2,814  
General and administrative1,917  2,808  4,367  5,620  
Research and development1,368  1,263  2,875  2,559  
Total included in operating expenses5,250  5,485  11,073  10,993  
Total share-based compensation expense$5,752  $5,979  $12,099  $12,025