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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (15,046) $ (11,663)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation 797 622
Stock-based compensation 6,927 4,404
Amortization of deferred commissions 3,325 3,027
Changes in assets and liabilities:    
Trade receivables 43,128 26,395
Prepaid expenses and other current assets (5,806) (2,497)
Deferred commissions (2,434) (2,906)
Other long term assets 41
Trade payables (152) 294
Accrued expenses and other short term liabilities (8,200) (6,421)
Deferred revenues (5,373) (2,417)
Other long term liabilities 237 (541)
Net cash provided by operating activities 17,444 8,297
Cash flows from investing activities:    
Increase in short-term investments (3,033) (4,757)
Increase in long-term deposits (308) (140)
Purchase of property and equipment (1,081) (1,498)
Net cash used in investing activities (4,422) (6,395)
Cash flows from financing activities:    
Proceeds from employee stock plans, net 1,066 882
Net cash provided by financing activities 1,066 882
Increase in cash, cash equivalents and restricted cash 14,088 2,784
Cash, cash equivalents and restricted cash at beginning of period 57,236 48,803
Cash, cash equivalents and restricted cash at end of period 71,324 51,587
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 102 $ 20