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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 15,510 $ 11,335
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,901 1,827
Stock-based compensation expense 1,478 1,064
Deferred income taxes (252) (428)
Provision for doubtful accounts 52
Provision for inventory 181 68
Tax benefit from equity awards (419) (934)
Changes in operating assets and liabilities:    
Accounts receivable (2,932) (2,389)
Inventories (2,438) 496
Prepaid expenses, other current and long-term assets 186 459
Accounts payable (4,252) 559
Accrued expenses and other current liabilities 446 (264)
Deferred revenue (45) (5)
Income taxes payable (3,169) 3,194
Other long-term liabilities 396 (98)
Net cash provided by operating activities 6,643 14,884
Cash flows from investing activities:    
Proceeds from maturity of investments 27,750 10,250
Purchase of investments (22,499) (22,018)
Purchase of property and equipment (9,869) (1,134)
Net cash used in investing activities (4,618) (12,902)
Cash flows from financing activities:    
Repurchases of common stock (25,000)
Proceeds from exercise of equity awards 922 969
Tax benefit from equity awards 419 934
Net cash (used in) provided by financing activities (23,659) 1,903
Exchange rate impact on cash 52 (121)
Increase (decrease) in cash and cash equivalents (21,582) 3,764
Cash and cash equivalents at beginning of period 110,707 100,156
Cash and cash equivalents at end of period 89,125 103,920
Non-cash Investing Activities:    
Purchases of property and equipment included in accounts payable and accrued expenses $ 2,128 $ 116