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Supplementary Balance Sheet Information | 12 Months Ended
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Dec. 31, 2013
Supplementary Balance Sheet Information | 10. Supplementary Balance Sheet Information The following tables provide the details of selected balance sheet items as of the periods indicated (in thousands): Inventories
|  | December 31, |
|  | 2013 |  |  | 2012 |
Raw materials |  | $ | 39,194 |  |  | $ | 30,554 |
Work-in-process |  |  | 13,186 |  |  |  | 11,959 |
Finished goods |  |  | 10,885 |  |  |  | 8,023 |
Demo and consigned inventory |  |  | 3,479 |  |  |  | 2,265 |
Total inventories |  | $ | 66,744 |  |  | $ | 52,801 |
Property, Plant and Equipment, net
|  | December 31, |
|  | 2013 |  |  | 2012 |
Cost: |  |  |  |  |  |  |  |
Land, buildings and improvements |  | $ | 38,591 |  |  | $ | 38,955 |
Machinery and equipment |  |  | 50,755 |  |  |  | 45,821 |
Total cost |  |  | 89,346 |  |  |  | 84,776 |
Accumulated depreciation |  |  | (56,856 | ) |  |  | (52,438 | )
Property, plant and equipment, net |  | $ | 32,490 |  |  | $ | 32,338 |
In 2011, the Company capitalized $2.2 million of assets which met the capital lease criteria of ASC 840-30, “Leases—Capital Lease”. The assets acquired under the capital lease are included in machinery and equipment and the related amortization expense is included in depreciation expense. The Company also capitalized software development costs of $0.2 million and $0.6 million in 2013 and 2012, respectively, based on the guidance in ASC 350-40, “Internal-Use Software”. The following table summarizes depreciation expense on property, plant and equipment, including amortization of demo units and the capital lease (in thousands):
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Depreciation expense |  | $ | 8,184 |  |  | $ | 9,612 |  |  | $ | 7,100 |
The following table summarizes total accumulated amortization on capital leases as of the periods indicated (in thousands):
|  | December 31, |
|  | 2013 |  |  | 2012 |
Accumulated amortization on capital leases |  | $ | 1,653 |  |  | $ | 861 |
Accrued Expenses and Other Current Liabilities The following table summarizes accrued expenses and other current liabilities as of the periods indicated (in thousands):
|  | December 31, |
|  | 2013 |  |  | 2012 |
Accrued compensation and benefits |  | $ | 9,326 |  |  | $ | 6,655 |
Accrued warranty |  |  | 3,690 |  |  |  | 2,777 |
Customer deposits |  |  | 1,147 |  |  |  | 3,033 |
Other |  |  | 10,413 |  |  |  | 6,813 |
Total accrued expenses and other current liabilities |  | $ | 24,576 |  |  | $ | 19,278 |
Accrued Warranty The following table summarizes accrued warranty activity for the periods indicated (in thousands):
|  | December 31, |
|  | 2013 |  |  | 2012 |
Balance at beginning of year |  | $ | 2,777 |  |  | $ | 3,035 |
Provision charged to cost of goods sold |  |  | 1,963 |  |  |  | 2,463 |
Acquisition related warranty accrual |  |  | 998 |  |  |  | — |
Use of provision |  |  | (2,074 | ) |  |  | (2,781 | )
Foreign currency exchange rate changes |  |  | 26 |  |  |  | 60 |
Balance at end of year |  | $ | 3,690 |  |  | $ | 2,777 |

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