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Composition of Certain Balance Sheet Items (Tables)
6 Months Ended
Jun. 30, 2018
Composition of Certain Balance Sheet Items [Abstract]  
Schedule of Property and Equipment
Property and equipment, net consisted of the following (in thousands):
 
June 30,
2018
 
December 31, 2017
Machinery and equipment
$
9,084

 
$
9,078

Leasehold improvements
579

 
579

Purchased computer software
1,299

 
1,316

Build-to-suit property
51,760

 
51,760

 
62,722

 
62,733

Less: accumulated depreciation and amortization
(9,324
)
 
(7,743
)
Property and equipment, net
$
53,398

 
$
54,990

Schedule of Other Current Liabilities
Other current liabilities consisted of the following (in thousands):
 
June 30, 2018
 
December 31, 2017
Payroll and related expenses
$
3,914

 
$
7,342

Professional services
641

 
438

Deferred rent
49

 
49

Other
500

 
1,356

Other current liabilities
$
5,104

 
$
9,185