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EQUITY INCENTIVE PLAN - Additional Information (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 USD ($) Option $ / shares shares | Dec. 31, 2021 USD ($) Option $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period |  | 4 years |
Stock-based compensation expense | $ |  | $ 6,901,000 | $ 1,117,000
Cash proceeds from exercise of stock options | $ |  | 1,497,000 | $ 120,000
Incremental value as a result of the modification of the awards | $ |  | 0 |
Incremental compensation expense recognized as a result of the modification | $ |  | 0 |
Total unrecognized stock-based compensation expense | $ | $ 13,650,000 | $ 13,650,000 |
Remaining vesting period |  | 2 years 7 months 28 days |
Chief Executive Officer |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award to purchase shares |  | 949,750 |
Number of separate option awards | Option | 2 | 2 |
Executive Chairman |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award to purchase shares |  | 474,874 |
Stock Option Grants |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ |  | $ 1,772,000 |
Expected annual equity volatility |  | 70.00% | 60.00%
Restricted Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Restricted stock units ("RSU") granted | 117,516 |  |
Total grant date fair value | $ | $ 1,080,000 |  |
Total grant date fair value recognized period | 3 years |  |
Restricted Stock Units | Chief Executive Officer |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Granted value | $ |  | $ 2,500,000 |
Incentive Unit Grants |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period |  | 4 years |
Repurchase right valid period |  | 18 months |
Incentive Unit Awards and Replacement Preferred Stock Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Expected annual equity volatility |  | 55.00% |
Earn-Out Shares |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Expected annual equity volatility |  | 54.50% |
Number of shares entitle to certain employees |  | 933,933 |
Expected term |  | 3 years |
Stock Options One | Chief Executive Officer |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award to purchase shares |  | 474,875 |
Stock Options Two | Chief Executive Officer |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award to purchase shares |  | 474,875 |
Two Separate Option Awards | Executive Chairman |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of separate option awards | Option | 2 | 2 |
Class A Common Stock | Chief Executive Officer |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award to purchase shares |  | 1,899,500 |
Vesting period |  | 4 years |
Class A Common Stock | Executive Chairman |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award to purchase shares |  | 712,312 |
Vesting period |  | 4 years |
Class A Common Stock | Restricted Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant date fair value per share | $ / shares | $ 9.19 |  |
Class A Common Stock | Stock Options One | Executive Chairman |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award to purchase shares |  | 237,437 |
Class A Common Stock | Separate Option Award | Chief Executive Officer |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award to purchase shares |  | 474,875 |
Hyperfine Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Common stock, capital shares reserved for future issuance | 16,013,762 | 16,013,762 |
Common stock remain available for issuance | 8,256,741 | 8,256,741 |
Option award to purchase shares |  | 6,771,237 | 1,182,056
Total intrinsic value of stock options exercised | $ |  | $ 2,752,000 | $ 167,000
Weighted-average grant date fair value of options granted | $ / shares |  | $ 0.66 | $ 0.69
Expected annual equity volatility |  | 70.00% | 60.00%
Hyperfine Plan | Service and Performance Shares |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option award to purchase shares |  | 258,833 |
Hyperfine Plan | Class A Common Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Exchange ratio |  | 0.3275 |
Liminal | Class A Common Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Exchange ratio |  | 0.1796 |
4Bionics Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ |  | $ 578,000 | $ 0

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