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Employee Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
The following table summarizes option activity under all plans during the years ended December 31, 2021 and 2020 and shows the exercisable shares as of December 31, 2021:

Number of SharesWeighted Average Exercise Price per Share
Options Outstanding January 1, 202010,132,562 $12.28 
Granted1,738,083 8.53 
Forfeited(713,070)14.23 
Exercised(2,631,935)2.30 
Expired(480,179)18.62 
Options Outstanding December 31, 20208,045,461 14.18 
Granted489,804 7.09 
Forfeited(370,106)14.04 
Exercised(426,762)3.79 
Expired(545,857)19.85 
Options Outstanding December 31, 20217,192,540 13.89 
Exercisable December 31, 20214,865,369 14.44 
Schedule of Black-Scholes Assumptions for Option Granted The table below summarizes the inputs used to calculate the estimated fair value of options awarded for the years ended December 31:
202120202019
Expected term (in years)5.795.946.28
Volatility65 %58 %60 %
Expected dividends— — — 
Risk free interest rates1.1 %0.6 %2.1 %
Estimated forfeitures— %— %— %
Weighted average fair value$4.09 $4.49 $8.33 
Schedule of Stock Option Supplemental Information
The following table shows summary information for outstanding options and options that are exercisable (vested) as of December 31, 2021:

Options
Outstanding		Options
Exercisable
Number of options7,192,540 4,865,369 
Weighted average remaining contractual term (in years)5.694.69
Weighted average exercise price$13.89 $14.44 
Weighted average fair value$8.64 $8.91 
Aggregate intrinsic value (in millions)$1.5 $1.5 
Schedule of Restricted Stock Activity
The following table summarizes RSU and stock grant activity during the years ended December 31, 2021 and 2020:

Number of SharesWeighted Average Grant Date Fair Value per Share
RSUs & Stock Grants Outstanding January 1, 202014,332 $16.66 
Granted813,256 11.44 
Forfeited(98,398)11.66 
Vested/released(202,776)12.41 
RSUs & Stock Grants outstanding December 31, 2020526,414 11.17 
Granted2,704,948 11.23 
Forfeited(479,472)11.01 
Vested/released(661,708)12.23 
RSUs & Stock Grants outstanding December 31, 20212,090,182 10.77 
Schedule of Weighted Average Fair Value of Grants Awarded The table below summarizes the weighted average fair value of RSUs and stock grants awarded for the years ending December 31:
202120202019
Weighted average fair value$11.23 $11.44 $20.32 
Schedule of Equity-Based Compensation Expense and Tax Benefit
The expense and tax benefits recognized on the Company’s consolidated statements of operations and comprehensive loss related to share-based compensation for the years ended December 31 (in thousands) is as follows:

202120202019
Cost of Sales$325 $351 $277 
Research and development4,102 4,035 4,115 
Sales, general and administrative17,620 12,078 8,226 
Total equity-based compensation expense$22,047 $16,464 $12,618 
Recognized tax benefit$— $— $— 

The share-based compensation cost capitalized to inventory or inventory transferred to property and equipment (also referred to as instruments) for the years ended December 31 (in thousands) is as follows:

202120202019
Cost capitalized to inventory$401 $253 $409 
The table below summarizes share-based compensation cost in connection with performance-based stock options for the years ending December 31 (in thousands):

202120202019
Performance-based stock option expense
$230 $215 $107 
The table below summarizes share-based compensation cost in connection with performance-based stock options for the years ending December 31 (in thousands):

202120202019
Performance-based RSU expense
$818 $810 $—