v2.4.0.8
Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 1,624 $ 2,280 $ 1,954
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization expense 9,612 7,341 5,373
Bad debt expense 307 218 193
Loss on disposal of property and equipment 12 10 1
Stock-based compensation 5,506 3,452 2,147
Non-cash interest expense 0 24 36
Amortization of premiums on investments 282 7 0
Changes in operating assets and liabilities:      
Accounts receivable (4,343) (4,014) (6,651)
Prepaid expenses and other assets 510 92 (3,564)
Accounts payable (112) (242) 1,248
Accrued liabilities 303 (1,110) 2,752
Deferred revenues 11,281 13,683 11,885
Other noncurrent liabilities 164 211 1,816
Net cash provided by operating activities 25,146 21,952 17,190
Cash flows from investing activities:      
Purchases of investments (145,263) (83,547) 0
Sales and maturities of investments 138,124 0 0
Purchases of property and equipment (13,663) (11,188) (7,499)
Release of restricted cash 114 0 0
Purchases of intangible assets 0 (49) 0
Net cash used in investing activities (20,688) (94,784) (7,499)
Cash flows from financing activities:      
Proceeds from initial public offering, net of offering costs 0 84,534 0
Proceeds from exercise of stock options 4,073 1,685 948
Proceeds from early exercise of stock options 40 384 390
Income tax benefits from exercise of stock options 150 0 0
Proceeds from issuance of Series C Preferred Stock 0 0 128
Principal payments under capital lease obligations (1,186) (2,401) (1,476)
Non-contingent payment related to acquisition 0 (1,000) 0
Net cash provided by (used in) financing activities 3,077 83,202 (10)
Effect of exchange rate changes on cash and cash equivalents (51) (33) (143)
Net increase in cash and cash equivalents 7,484 10,337 9,538
Cash and cash equivalents at beginning of period 34,885 24,548 15,010
Cash and cash equivalents at end of period 42,369 34,885 24,548
Supplemental disclosures of cash flow information      
Cash paid for interest expense 43 162 128
Cash paid for income taxes, net of refunds 390 299 108
Non-cash investing and financing activities      
Purchase of property and equipment recorded in accrued liabilities 487 0  
Purchase of property and equipment under capital lease 0 0 3,100
Vesting of early exercised common stock options 262 155 52
Conversion of convertible preferred stock to common stock 0 63,873 0
Issuance of common stock for acquisition of license $ 0 $ 51 $ 0