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Restructurings (Tables)
6 Months Ended
Jun. 30, 2020
Restructuring and Related Activities [Abstract]  
Restructuring Expense by Components
Total restructuring expense included in our statement of operations for the three and six month periods ended June 30, 2020 and 2019 is comprised of the following:
 Three Months EndedSix Months Ended
June 30,June 30,
 2020201920202019
Operating expenses — restructuring:
Employee severance and benefits
$—  $398  $592  $398  
Total restructuring expense$—  $398  $592  $398  
Schedule of Accrued Restructuring Liabilities
The following is a rollforward of the accrued liabilities related to restructuring for the six month period ended June 30, 2020:

Balance as of December 31, 2019
ExpensedPayments
Balance as of
June 30, 2020
Employee severance and benefits
$66  $592  $(658) $—  
Accrued costs related to restructuring
$66  $592  $(658) $—