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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Allowance for Doubtful Accounts | For the years ended December 31, 2013, 2012 and 2011, the allowance for doubtful accounts was as follows (in thousands):
|  | 2013 |  |  | 2012 |  |  | 2011 |
Balance at beginning of year |  | $ | 374 |  |  | $ | 337 |  |  | $ | 499 |
Provision (benefit) charged to selling, general and administrative expense |  |  | 325 |  |  |  | 185 |  |  |  | (61 | )
Allowance resulting from acquisition |  |  | 117 |  |  |  | — |  |  |  | — |
Write-offs, net of recoveries of amounts previously reserved |  |  | (187 | ) |  |  | (162 | ) |  |  | (102 | )
Exchange rate changes |  |  | 22 |  |  |  | 14 |  |  |  | 1 |
Balance at end of year |  | $ | 651 |  |  | $ | 374 |  |  | $ | 337 |
Laser Quantum |
Summary of Financial Information of Laser Quantum - Income Statement | The summarized financial information for Laser Quantum is as follows (in thousands):
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Sales |  | $ | 16,269 |  |  | $ | 13,039 |  |  | $ | 18,384 |
Income from operations |  | $ | 4,720 |  |  | $ | 3,592 |  |  | $ | 3,994 |
Net income |  | $ | 3,745 |  |  | $ | 2,215 |  |  | $ | 4,684 |
Summary of Financial Information of Laser Quantum - Balance Sheet |
|  | 2013 |  |  | 2012 |
Total assets |  | $ | 20,990 |  |  | $ | 21,596 |
Total liabilities |  | $ | 4,240 |  |  | $ | 5,330 |

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