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Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Potentially Issuable Common Shares Excluded from Computation of Diluted Net Loss Per Share
The following potentially issuable common shares were not included in the computation of diluted net loss per share because they would have an anti-dilutive effect due to net losses at of the following at December 31 (in thousands):

202120202019
Shares issuable upon the release of restricted stock awards2,090 526 14 
Shares issuable upon exercise of stock options7,193 8,045 10,133 
9,283 8,571 10,147