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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 591 $ 1,746
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 309 269
Stock-based compensation 242 322
Amortization of premium on investments (5)  
Deferred tax provision on other comprehensive income 21 (79)
(Gain)/loss on sale of investments (12) 59
Changes in assets and liabilities:    
Accounts receivable (1,202) (1,312)
Inventories   1,538
Prepaid expenses and other current assets (692) 338
Deferred tax assets 46 197
Accounts payable (111) (923)
Accrued expenses 118 170
Accrued income taxes   88
Deferred revenue 593 270
Net cash provided by (used in) operating activities (102) 2,683
Cash flows from investing activities:    
Purchases of property and equipment (68) (101)
Sales of investments 529 1,432
Purchase of other assets (320)  
Net cash provided by investing activities 141 1,331
Cash flows from financing activities:    
Proceeds from issuance of common stock 22 68
Excess tax benefits from stock-based compensation 554 592
Payments made for taxes of employees who surrendered shares related to unrestricted stock (87) (92)
Net cash provided by financing activities 489 568
Increase in cash and cash equivalents 528 4,582
Cash and cash equivalents, beginning of period 43,985 72,660
Cash and cash equivalents, end of period 44,513 77,242
Supplemental disclosure:    
Cash paid for income taxes 346 2
Non-cash transactions:    
Stock option receivables offset against proceeds from issuance of common stock $ 0 $ 138