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Common Stock (Tables)
12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Stock by Class
As of December 31, 2018 and 2017, the Company had reserved for future issuance the following number of shares of common stock (in thousands):
 
December 31,
 
2018
 
2017
Shares reserved for vesting of restricted stock awards
7

 
16

Shares reserved for vesting of restricted stock units
371

 

Shares reserved for exercises of outstanding stock options
5,023

 
4,868

Shares reserved for future issuances under the 2017 Stock Option and Incentive Plan
1,114

 
1,032

Total shares reserved for future issuance
6,515

 
5,916