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EMPLOYEE EQUITY-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
The following table summarizes option activity under the plan during the years ended December 31, 2022 and 2021 and shows the exercisable shares as of December 31, 2022:

Number of SharesWeighted Average Exercise Price per Share
Options Outstanding January 1, 20218,045,461 $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 
Granted140,000 3.05 
Forfeited(208,569)12.58 
Exercised(6,105)1.04 
Expired(1,709,205)10.96 
Options Outstanding December 31, 20225,408,661 14.60 
Exercisable December 31, 20224,263,496 15.39 
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:
202220212020
Expected term (in years)6.305.795.94
Volatility66 %65 %58 %
Expected dividends— — — 
Risk free interest rates2.1 %1.1 %0.6 %
Estimated forfeitures— %— %— %
Weighted average fair value$1.88 $4.09 $4.49 
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, 2022:

Options
Outstanding		Options
Exercisable
Number of options5,408,661 4,263,496 
Weighted average remaining contractual term (in years)5.254.82
Weighted average exercise price$14.60 $15.39 
Weighted average fair value$9.08 $9.46 
Aggregate intrinsic value (in millions)$— $— 
Schedule of Restricted Stock Activity
The following table summarizes RSU and stock grant activity during the years ended December 31, 2022 and 2021:

Number of SharesWeighted Average Grant Date Fair Value per Share
RSUs & Stock Grants Outstanding January 1, 2021526,414 $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 
Granted4,227,921 1.53 
Forfeited(662,038)8.28 
Vested/released(1,300,645)3.70 
RSUs & Stock Grants outstanding December 31, 20224,355,420 4.29 
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 ended December 31:
202220212020
Weighted average fair value$1.53 $11.23 $11.44 
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:

202220212020
Cost of Sales$665 $325 $351 
Research and development1,419 4,102 4,035 
Sales, general and administrative8,541 17,620 12,078 
Total equity-based compensation expense$10,625 $22,047 $16,464 
Recognized tax benefit$— $— $— 

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:

202220212020
Cost capitalized to inventory$254 $401 $253 
The table below summarizes share-based compensation cost in connection with performance-based stock options for the years ended December 31 (in thousands):

202220212020
Performance-based stock option expense
$— $230 $215 
The table below summarizes share-based compensation cost in connection with performance-based stock options for the years ended December 31 (in thousands):

202220212020
Performance-based RSU expense
$— $818 $810