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Supplemental Cash Flow Information and Non-Cash Activity (Tables)
 9 Months Ended
Sep. 30, 2013
Supplemental Cash Flow Elements [Abstract]  
Summary of Non-cash Items from Investing and Financing Activities
A summary of non-cash items from investing and financing activities is as follows (in thousands):
 
Nine Months Ended September 30,
 
2013
 
2012
Purchases of computer equipment financed through capital leases
$
5,962

 
$
2,953

Leasehold improvement paid by landlord
$
5,000

 
$
—

Conversion of investment in a convertible note to equity
$
6,765

 
$
—

Transfer of inventory to seismic rental equipment
$
1,471

 
$
6,730

Purchases of property, plant, and equipment and seismic rental equipment financed through accounts payable
$
835

 
$
—