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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Changes in Allowance for Doubtful Accounts | For the years ended December 31, 2015, 2014 and 2013, changes in the allowance for doubtful accounts were as follows (in thousands):
| 2015 |  |  | 2014 |  |  | 2013 |
Balance at beginning of year | $ | 282 |  |  | $ | 575 |  |  | $ | 294 |
Provision charged to selling, general and administrative expenses |  | 285 |  |  |  | 30 |  |  |  | 301 |
Allowance resulting from acquisitions |  | 5 |  |  |  | 52 |  |  |  | 117 |
Write-offs, net of recoveries of amounts previously reserved |  | (29 | ) |  |  | (352 | ) |  |  | (159 | )
Divestiture of JK Lasers |  | (30 | ) |  |  | — |  |  |  | — |
Exchange rate changes |  | (13 | ) |  |  | (23 | ) |  |  | 22 |
Balance at end of year | $ | 500 |  |  | $ | 282 |  |  | $ | 575 |
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, |
| 2015 |  |  | 2014 |  |  | 2013 |
Revenue | $ | 25,599 |  |  | $ | 23,013 |  |  | $ | 16,269 |
Income from operations | $ | 7,362 |  |  | $ | 7,434 |  |  | $ | 4,720 |
Net income | $ | 6,925 |  |  | $ | 6,627 |  |  | $ | 3,745 |
Summary of Financial Information of Laser Quantum - Balance Sheet |
| December 31, |
| 2015 |  |  | 2014 |
Total assets (1) | $ | 30,159 |  |  | $ | 25,423 |
Total liabilities | $ | 2,552 |  |  | $ | 2,482 |
| (1) | Total assets at December 31, 2015 and 2014 included cash and cash equivalent of $21.0 million and $17.1 million, respectively.

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