Noncash Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021 and December 31, 2020, respectively, (in thousands): 

Award type	March 31, 2021	December 31, 2020
Restricted stock units (time-based)	2,011	1,802
Restricted stock units (performance-based)	140	162
Stock appreciation rights	—	28
Market stock units	126	111

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 months ended March 31, 2021 and 2020:

	Three Months Ended March 31,
	2021		2020
Share-based compensation:
Cost of revenue	$	826	$	524
Operating expenses:
Selling and marketing	2,224		1,866
Research and development	1,826		1,507
General and administrative	3,294		2,450
Total included in operating expenses	7,344		5,823
Total share-based compensation expense	$	8,170	$	6,347

Market Stock Units Valuation Assumptions

The assumptions used to value the MSUs granted during the three months ended March 31, 2021 were as follows:

	March 31, 2021
Volatility	53.29	%
Risk-free interest rate	0.22	%
Expected option life in years	2.97
Dividend yield	—