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Balance Sheet Details (Tables)
 12 Months Ended
Dec. 31, 2019
Balance Sheet Details [Abstract]  
Schedule of Other Current Assets
Other current assets consist of the following (in thousands):
 
December 31,
 
2019
 
2018
Reimbursement from Required Materials partners (1)
$
6,552

 
$
3,785

Other
10,054

 
5,725

Other current assets
$
16,606

 
$
9,510
Schedule of Accrued Liabilities
Accrued liabilities consist of the following (in thousands):
 
December 31,
 
2019
 
2018
Payable to Required Materials partners (2)
$
4,898

 
$
6,420

Acquisition-related compensation
4,042

 
8,536

Taxes payable
3,046

 
3,864

Accrued purchases of long-lived assets
10,036

 
1,210

Other
17,942

 
14,047

Accrued liabilities
$
39,964


$
34,077


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(1) Reimbursement from Required Materials partners represents the cost of print textbooks sourced on their behalf.
(2) Payable to Required Materials partners represents the amounts owed to our partners for the rental and sale of print textbooks.