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Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
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):

202020192018
Shares issuable upon the release of restricted stock awards526 14 76 
Shares issuable upon exercise of stock options8,045 10,133 8,091 
8,571 10,147 8,167