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Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 6,529 $ 8,978
Marketable securities 38,316 29,307
Accounts receivable, net of allowance for doubtful accounts of approximately $606 as of March 31, 2013 and $929 as of December 31, 2012 29,392 27,654
Inventories 16,918 16,203
Prepaid expenses and other assets 4,071 3,264
Deferred income taxes 824 1,146
Total current assets 96,050 86,552
Property and equipment, less accumulated depreciation of $32,834 as of March 31, 2013 and $31,657 as of December 31, 2012 35,912 36,733
Intangible assets, less accumulated amortization of $873 as of March 31, 2013 and $826 as of December 31, 2012 1,524 1,684
Goodwill 4,527 4,712
Other non-current assets 4,137 4,363
Deferred income taxes 3,153 3,524
Total assets 145,303 137,568
Current liabilities:    
Accounts payable 6,760 7,086
Accrued compensation and employee-related expenses 5,093 6,785
Accrued other 5,409 4,595
Accrued product warranty costs 803 814
Deferred revenue 2,074 1,892
Current portion of long-term debt 1,098 138
Total current liabilities 21,237 21,310
Other long-term liabilities 1,309 140
Line of credit 7,000 7,000
Long-term debt excluding current portion 7,009 3,414
Total liabilities 36,555 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, 16,785,842 and 16,563,836 shares issued at March 31, 2013 and December 31, 2012; and 15,126,851 and 14,904,845 shares outstanding at March 31, 2013 and December 31, 2012, respectively 168 166
Additional paid-in capital 112,947 111,514
Retained earnings 9,270 7,307
Accumulated other comprehensive loss (487) (133)
Less: treasury stock at cost, common stock, 1,658,991 shares as of March 31, 2013 and December 31, 2012 (13,150) (13,150)
Total stockholders' equity 108,748 105,704
Total liabilities and stockholders' equity $ 145,303 $ 137,568