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Business and Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of revenue | The following table presents a summary of revenue:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Subscription revenue | $ | 53,511 |  |  | $ | 34,932 |  |  | $ | 146,568 |  |  | $ | 93,478 |
Perpetual license and maintenance revenue | 13,864 |  |  | 12,857 |  |  | 40,753 |  |  | 37,129 |
Professional services and other revenue | 2,065 |  |  | 1,191 |  |  | 4,818 |  |  | 3,003 |
Revenue | $ | 69,440 |  |  | $ | 48,980 |  |  | $ | 192,139 |  |  | $ | 133,610 |
Activity of deferred contract costs | The following summarizes the activity of deferred incremental costs of obtaining a contract in the periods presented:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Beginning balance | $ | 50,805 |  |  | $ | 36,252 |  |  | $ | 50,176 |  |  | $ | 30,118 |
Capitalization of contract acquisition costs | 7,138 |  |  | 9,032 |  |  | 16,985 |  |  | 21,194 |
Amortization of deferred contract acquisition costs | (5,059 | ) |  | (3,891 | ) |  | (14,277 | ) |  | (9,919 | )
Ending balance | $ | 52,884 |  |  | $ | 41,393 |  |  | $ | 52,884 |  |  | $ | 41,393 |

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- Definition Tabular disclosure of cost capitalized in obtaining or fulfilling contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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