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Employee Equity-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
The following table summarizes option activity under the Company's equity-based compensation plans for the six months ended June 30, 2022:

Number of SharesWeighted Average Exercise Price per Share
Options outstanding January 1, 20227,192,540 $13.89 
Granted140,000 3.05 
Forfeited(128,670)13.02 
Exercised(6,105)1.04 
Expired(1,158,808)10.05 
Options outstanding June 30, 20226,038,957 $14.41 
Schedule of Black-Scholes Assumptions for Option Granted
The table below summarizes the resulting weighted average inputs used to calculate the estimated fair value of options awarded for the three months ended June 30, 2022 and 2021:

Three Months Ended June 30,
20222021
Expected term (in years)0.05.79
Volatility— %65 %
Expected dividends— — 
Risk free interest rates— %1.10 %
Weighted average fair value$— $4.09 
Schedule of Stock Option Supplemental Information
The following table shows summary information for outstanding options and options that are exercisable (vested) as of June 30, 2022:

Options
Outstanding		Options
Exercisable
Number of options6,038,957 4,644,828 
Weighted average remaining contractual term (in years)5.715.18
Weighted average exercise price$14.41 $15.04 
Weighted average fair value$9.00 $9.31 
Aggregate intrinsic value (in thousands)$— $— 
Schedule of Restricted Stock Activity
The following table summarizes RSU and restricted stock award activity for the six months ended June 30, 2022:

Number of SharesWeighted Average Grant Date Fair Value per Share
Outstanding January 1, 20222,090,182 $10.77 
Granted4,107,083 1.55 
Forfeited(167,129)9.94 
Vested/released(1,121,468)3.39 
Outstanding June 30, 20224,908,668 $4.77 
Schedule of Equity-Based Compensation Expense and Tax Benefit
The table below summarizes equity-based compensation expense for the three and six months ended June 30, 2022 and 2021 (in thousands):

Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Cost of sales$228 $74 $403 $175 
Research and development539 1,328 901 4,074 
Sales, general and administrative3,204 5,188 5,646 11,180 
$3,971 $6,590 $6,950 $15,429 

The table below summarizes share-based compensation cost capitalized to inventory or inventory transferred to property and equipment (also referred to as instruments) for the three and six months ended June 30, 2022 and 2021 (in thousands):

Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Cost capitalized to inventory
$74 $87 $117 $242 
The table below summarizes share-based compensation cost in connection with performance-based stock options for the six months ended June 30, 2022 and 2021 (in thousands):

Six Months Ended June 30,
20222021
Performance-based stock option expense
$— $230 
The table below summarizes share-based compensation cost in connection with performance-based RSUs for the six months ended June 30, 2022 and 2021 (in thousands):

Six Months Ended June 30,
20222021
Performance-based RSU expense
$— $818