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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
OPERATING ACTIVITIES:    
NET INCOME $ 12,524 $ 3,551
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 4,438 4,543
Depreciation and amortization 4,212 4,259
Amortization of lease incentives (60)  
Unrealized foreign currency loss 75 450
Deferred income taxes (205) 198
Changes in assets and liabilities    
Restricted cash (1,810)  
Accounts receivable 3,818 (1,572)
Inventories 1,236 633
Prepaid expenses and other assets 1,186 (614)
Accounts payable (125) (72)
Deferred revenue (1,829) 5,269
Accrued expenses and other liabilities (90) (1,540)
Net cash provided by operating activities 23,370 15,105
INVESTING ACTIVITIES:    
Purchases of short-term investments (22,966) (19,411)
Proceeds from maturities of short-term investments 22,966 16,450
Purchases of property and equipment (3,512) (1,885)
Net cash used in investing activities (3,512) (4,846)
FINANCING ACTIVITIES:    
Payments for debt issue costs (367)  
Proceeds from exercise of stock options 894 124
Repurchase of common stock (3,311) (883)
Net cash used in financing activities (2,784) (759)
EFFECT OF FOREIGN EXCHANGE RATE CHANGES ON CASH 558 (1,690)
NET INCREASE IN CASH AND CASH EQUIVALENTS 17,632 7,810
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 94,094 92,867
CASH AND CASH EQUIVALENTS, END OF PERIOD 111,726 100,677
Cash paid for income taxes 812 230
Noncash investing activities (accrued property and equipment purchases) $ 241 $ 76