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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 6,895 $ 3,516
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 942 914
Stock-based compensation expense 817 555
Deferred income taxes 555 (177)
Provision for inventory 82 30
Tax benefit from equity awards (364) (934)
Changes in operating assets and liabilities:    
Accounts receivable 7,034 761
Inventories (787) (284)
Prepaid expenses, other current and long-term assets $ (267) 477
Prepaid income taxes (1,199)
Accounts payable $ (3,629) 632
Accrued expenses and other current liabilities (1,306) (375)
Deferred revenue (39) $ 112
Income taxes payable (2,205)
Other long-term liabilities (48) $ (44)
Net cash provided by operating activities 7,680 3,984
Cash flows from investing activities:    
Proceeds from maturity of investments 14,250 1,500
Purchase of investments (9,499) (7,250)
Purchase of property and equipment (6,418) (256)
Net cash used in investing activities (1,667) $ (6,006)
Cash flows from financing activities:    
Repurchases of common stock (25,000)
Proceeds from exercise of equity awards 668 $ 964
Tax benefit from equity awards 364 934
Net cash (used in) provided by financing activities (23,968) 1,898
Exchange rate impact on cash 85 (230)
Decrease in cash and cash equivalents (17,870) (354)
Cash and cash equivalents at beginning of period 110,707 100,156
Cash and cash equivalents at end of period 92,837 99,802
Non-cash Investing Activities:    
Purchases of property and equipment included in accounts payable and accrued expenses $ 824 $ 24