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Accrued Liabilities and Other Long-Term Liabilities
 6 Months Ended
Jun. 30, 2021
Accrued Liabilities and Other Liabilities [Abstract]  
Accrued Liabilities and Other Long-Term Liabilities Accrued Liabilities and Other Long-Term Liabilities
Accrued Liabilities
Accrued liabilities consisted of the following (in thousands):
As of
June 30,
2021
As of
December 31,
2020
Accrued compensation and benefits$3,069 $4,542 
Accrued research and development expenses4,028 3,274 
Other accrued liabilities951 1,675 
Deferred rent120 85 
Total accrued liabilities$8,168 $9,576 
Accrued compensation and benefits consist primarily of accrued bonuses and accrued vacation.
Other Long-Term Liabilities
Other long-term liabilities consisted of the following (in thousands):
  
As of
June 30,
2021
As of
December 31,
2020
Deferred rent$561 $581 
Leasehold incentive obligation243 283 
Other liabilities — deposits— 2 
Total other long-term liabilities$804 $866