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STOCKHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU activity under the Plan

The activity for stock subject to vesting for years ended December 31, 2020 and 2019, are as follows (shares in thousands):

​

​

​

​

​

​

​

​

Shares subject 

    

Weighted Average

​

    

to Vesting

    

 Purchase Price

Balance of unvested shares as of January 1, 2020

​

5,587

​

$0.0001

Issuance of additional shares

 

—

 

—

Vested

 

(5,307)

 

$0.001

Balance of unvested shares as of December 31, 2020

 

280

 

$0.001

Schedule of Preferred Stock authorized, issued and outstanding

​

​

​

​

​

​

​

​

    

Prior to Business Combination

Legacy Convertible Preferred Stock Classes

​

Shares Authorized, Issued and Outstanding

​

Preferred Stock

Series A Legacy Convertible Preferred Stock, $0.0001 par value

​

​

26,189,545

​

$

13,878

Series B Legacy Convertible Preferred Stock, $0.0001 par value

 

​

23,675,035

​

​

37,806

Series C Legacy Convertible Preferred Stock, $0.0001 par value

 

​

13,152,896

​

​

44,852

Series D Legacy Convertible Preferred Stock, $0.0001 par value

 

​

21,075,193

​

​

180,353

Series E Legacy Convertible Preferred Stock, $0.0001 par value

 

​

13,450,703

​

​

134,667

Series E‑1 Legacy Convertible Preferred Stock, $0.0001 par value

 

​

2,494,737

​

​

24,977

Total

​

​

100,038,109

​

$

436,533

Collaboration Agreement  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of warrants-pricing model

​

​

​

​

​

​

​

​

​

​

​

Years Ended December 31, 

 

​

​

2020

    

2019

 

Risk‑free interest rate

​

​

2.0

%

​

2.0

%

Expected volatility

​

​

52.5

%

​

52.5

%

Expected life (in years)

​

​

8.0

​

​

8.0 – 8.8

​

Expected dividend yield

​

​

—

​

​

—

​

Fair value of Common Stock

​

$

3.34

​

$

3.34

​

Technical Technical Research and Development Advisor Services  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of warrants-pricing model

​

​

​

​

​

​

​

​

Year Ended December 31, 

​

​

2020

    

Risk‑free interest rate

​

​

0.5

%

Expected volatility

​

​

52.5

%

Expected life (in years)

​

​

0.3

​

Expected dividend yield

​

​

—

​

Fair value of Common Stock

​

$

7.98

​

Private Placement Warrants  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of warrants-pricing model

​

​

​

​

​

​

​

​

​

​

​

​

 

​

​

As of December 31, 2020

    

As of December 9, 2020

 

Risk‑free interest rate

​

​

0.4

%

​

0.4

%

Expected volatility

​

​

50.0

%

​

40.0

%

Expected life (in years)

​

​

4.9

​

​

5

​

Expected dividend yield

​

​

—

​

​

—

​

Fair value of Common Stock

​

$

17.20

​

$

24.77

​