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Common Stock
6 Months Ended
Jun. 30, 2020
Stockholders' Equity Note [Abstract]  
Common Stock
6. Common Stock
The Company has issued restricted shares of common stock to its founders and
non-employees.
In addition, the Company has issued restricted shares of common stock upon the early exercise of stock options under the Company’s 2016 Plan. The restrictions on the common shares generally lapse over four years. The Company has included the proceeds from the sale of the restricted shares of common stock as a restricted stock liability in the accompanying consolidated balance sheets. Amounts are reclassified to additional paid in capital as the restrictions lapse. The Company has the right to repurchase any unvested shares of restricted common stock at the original cost in the event of termination.
The following table summarizes the restricted stock activity for the six months ended June 30, 2020:
 
 
  
Shares
 
  
Weighted-
Average
Purchase
Price
 
Unvested at December 31, 2019
  
 
679,158
 
  
$
0.21
 
Vested
  
 
(373,837
  
 
0.39
 
Cancelled
  
 
(14,844
  
 
0.03
 
 
  
 
 
 
  
   
Unvested at June 30, 2020
  
 
290,477
 
  
$
0.03