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Net investment in sales-type leases (Tables)
 6 Months Ended
Jun. 30, 2012
Leases [Abstract]  
Schedule of components of the net investment in sales-type leases
The components of our net investment in sales-type leases are as follows (in thousands):
 
December 31,
December 31,
June 30,
 
2010
2011
2012
 
 
 
(unaudited)

Net minimum lease payments to be received
$
—

$
—

$
1,588

Less unearned interest income portion
—

—

(151
)
Net investment in sales-type leases
—

—

1,437

Less current portion
—

—

(498
)
Non-current net investment in sales-type leases
$
—

$
—

$
939
Schedule of minimum lease payments under sales-type leases
The minimum lease payments under sales-type leases as of June 30, 2012 (unaudited) were as follows (in thousands):
2012 (remaining six months)
$
289

2013
578

2014
578

2015
143

2016 and thereafter
—

Total
$
1,588