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Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 9,213 | $ 8,978
Marketable securities | 48,364 | 29,307
Accounts receivable, net of allowance for doubtful accounts of approximately $1,252 as of September 30, 2013 and $929 as of December 31, 2012 | 25,731 | 27,654
Inventories | 18,133 | 16,203
Prepaid expenses and other assets | 3,891 | 3,264
Deferred income taxes | 712 | 1,146
Total current assets | 106,044 | 86,552
Property and equipment, less accumulated depreciation of $35,153 as of September 30, 2013 and $31,657 as of December 31, 2012 | 36,706 | 36,733
Intangible assets, less accumulated amortization of $1,633 as of September 30, 2013 and $826 as of December 31, 2012 | 15,181 | 1,684
Goodwill | 18,086 | 4,712
Other non-current assets | 4,972 | 4,363
Deferred income taxes | 38 | 3,524
Total assets | 181,027 | 137,568
Current liabilities: |  |
Accounts payable | 7,930 | 7,086
Accrued compensation and employee-related expenses | 5,490 | 6,785
Accrued other | 6,969 | 4,595
Accrued product warranty costs | 1,010 | 814
Deferred revenue | 5,468 | 1,892
Current portion of long-term debt | 1,044 | 138
Total current liabilities | 27,911 | 21,310
Other long-term liabilities | 1,121 | 140
Line of credit | 30,000 | 7,000
Long-term debt, excluding current portion | 6,407 | 3,414
Total liabilities | 65,439 | 31,864
Stockholders’ equity: |  |
Preferred stock, $0.01 par value. Authorized 1,000,000 shares; none issued | 0 | 0
Common stock, $0.01 par value. Authorized 30,000,000 shares; 16,886,063 and 16,563,836 shares issued at September 30, 2013 and December 31, 2012; and 15,227,072 and 14,904,845 shares outstanding at September 30, 2013 and December 31, 2012, respectively | 169 | 166
Additional paid-in capital | 115,970 | 111,514
Retained earnings | 12,205 | 7,307
Accumulated other comprehensive income (loss) | 394 | (133)
Less: treasury stock at cost, common stock, 1,658,991 shares as of September 30, 2013 and December 31, 2012 | (13,150) | (13,150)
Total stockholders’ equity | 115,588 | 105,704
Total liabilities and stockholders’ equity | $ 181,027 | $ 137,568

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