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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Operating activities: |  |
Net income | $ 6,255,000 | $ 4,731,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 458,000 | 258,000
Stock-based compensation expense | 1,660,000 | 1,309,000
Amortization of acquired intangible assets | 18,000 | 18,000
Deferred taxes | 1,886,000 | 981,000
Losses on disposal of property and equipment | 34,000 | 46,000
Purchases of treasury stock in connection with tax withholdings on restricted stock grants | (8,000) | (8,000)
Reversal of doubtful accounts | (28,000) |
Unrealized loss on foreign currency forward contract | 24,000 |
Tax benefit related to stock-based compensation expense | 44,000 | 888,000
Excess tax benefit from stock-based compensation | (41,000) | (747,000)
Changes in operating assets and liabilities: |  |
Accounts receivable | 2,373,000 | 1,844,000
Prepaid expenses and other assets | (264,000) | (2,528,000)
Accounts payable | (279,000) | (1,064,000)
Accrued compensation and related benefits | (2,386,000) | (4,832,000)
Accrued and other liabilities | (442,000) | (1,055,000)
Deferred revenues | 2,537,000 | 668,000
Billings in excess of recognized revenues | 248,000 | (159,000)
Net cash provided by operating activities | 12,089,000 | 350,000
Investing activities: |  |
Purchases of property and equipment | (929,000) | (1,211,000)
Net cash used in investing activities | (929,000) | (1,211,000)
Financing activities: |  |
Proceeds from exercise of stock options | 784,000 | 1,201,000
Proceeds from employee stock purchase plan | 632,000 | 546,000
Excess tax benefit from stock-based compensation | 41,000 | 747,000
Purchases of treasury stock | (968,000) |
Net cash provided by financing activities | 489,000 | 2,494,000
Effect of exchange rate changes on cash and cash equivalents | (26,000) | (87,000)
Net change in cash and cash equivalents | 11,623,000 | 1,546,000
Cash and cash equivalents, beginning of period | 89,371,000 | 61,637,000
Cash and cash equivalents, end of period | 100,994,000 | 63,183,000
Cash paid during the period for: |  |
Taxes | 1,648,000 | 779,000
Property and equipment received and accrued in accounts payable and accrued and other liabilities | $ 400,000 | $ 559,000

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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