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Revenue - Impacts on financial statements (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Current assets |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net of allowance | $ 59,631 |  |  |  | $ 48,126 |  |  |  | $ 59,631 | $ 48,126 |  |
Contract asset | 7,962 |  |  |  |  |  |  |  | 7,962 |  |  |
Other current assets | 5,705 |  |  |  | 5,501 |  |  |  | 5,705 | 5,501 |  |
Total current assets | 191,956 |  |  |  | 227,937 |  |  |  | 191,956 | 227,937 |  |
Deferred income taxes | 5,601 |  |  |  | 5,460 |  |  |  | 5,601 | 5,460 |  |
Contract assets - non-current | 3,316 |  |  |  |  |  |  |  | 3,316 |  |  |
Other assets | 8,400 |  |  |  | 5,229 |  |  |  | 8,400 | 5,229 |  |
Total assets | 352,826 |  |  |  | 337,622 |  |  |  | 352,826 | 337,622 |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | 33,633 |  |  |  | 33,295 |  |  |  | 33,633 | 33,295 |  |
Short-term income taxes payable | 6,905 |  |  |  | 3,673 |  |  |  | 6,905 | 3,673 |  |
Other accrued expenses | 9,323 |  |  |  | 7,746 |  |  |  | 9,323 | 7,746 |  |
Total current liabilities | 72,357 |  |  |  | 66,153 |  |  |  | 72,357 | 66,153 |  |
Deferred revenue - non-current | 10,672 |  |  |  | 7,019 |  |  |  | 10,672 | 7,019 |  |
Deferred income taxes | 2,661 |  |  |  | 7,753 |  |  |  | 2,661 | 7,753 |  |
Total liabilities | 100,385 |  |  |  | 99,692 |  |  |  | 100,385 | 99,692 |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |
Accumulated income | 172,378 |  |  |  | 156,151 |  |  |  | 172,378 | 156,151 |  |
Total stockholders' equity | 252,441 |  |  |  | 237,930 |  |  |  | 252,441 | 237,930 |  |
Total liabilities and stockholders' equity | 352,826 |  |  |  | 337,622 |  |  |  | 352,826 | 337,622 |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | 64,799 | $ 52,495 | $ 49,554 | $ 45,432 | 54,506 | $ 51,126 | $ 45,694 | $ 41,965 | 212,280 | 193,291 | $ 192,304 |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |
Total cost of goods sold |  |  |  |  |  |  |  |  | 64,813 | 58,777 | 61,647 |
Gross profit | 42,246 | 34,543 | 35,981 | 34,697 | 35,908 | 36,646 | 32,048 | 29,912 | 147,467 | 134,514 | 130,657 |
Operating costs |  |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | 63,805 | 58,994 | 57,347 |
Total operating costs | 38,145 | 37,657 | 38,592 | 33,049 | 34,730 | 31,534 | 32,448 | 29,610 | 147,443 | 128,322 | 121,058 |
Operating income | 4,101 | (3,114) | (2,611) | 1,648 | 1,178 | 5,112 | (400) | 302 | 24 | 6,192 | 9,599 |
Income (loss) before taxes |  |  |  |  |  |  |  |  | 3,553 | 8,381 | 11,377 |
Provision (benefit) for income taxes | 650 | (1,702) | (872) | 629 | 27,786 | 2,558 | 313 | 233 | (293) | 30,780 | 863 |
Net income (loss) | $ 3,964 | $ (908) | $ (1,002) | $ 1,792 | $ (25,837) | $ 2,755 | $ 110 | $ 573 | $ 3,846 | $ (22,399) | $ 10,514 |
Basic (in dollars per share) | $ 0.10 | $ (0.02) | $ (0.03) | $ 0.04 | $ (0.65) | $ 0.07 | $ 0.00 | $ 0.01 | $ 0.10 | $ (0.56) | $ 0.27 |
Diluted (in dollars per share) | $ 0.10 | $ (0.02) | $ (0.03) | $ 0.04 | $ (0.65) | $ 0.07 | $ 0.00 | $ 0.01 | $ 0.10 | $ (0.56) | $ 0.27 |
Product and license |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | $ 152,977 | $ 147,257 | $ 156,057 |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |
Total cost of goods sold |  |  |  |  |  |  |  |  | 50,706 | 48,333 | 53,191 |
Service and other |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 59,303 | 46,034 | 36,247 |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |
Total cost of goods sold |  |  |  |  |  |  |  |  | 14,107 | $ 10,444 | $ 8,456 |
ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |
Accumulated income |  |  |  |  |  |  |  |  |  |  |  | $ 11,900
ASU 2014-09 | Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net of allowance | $ (331) |  |  |  |  |  |  |  | (331) |  |  |
Contract asset | (7,962) |  |  |  |  |  |  |  | (7,962) |  |  |
Other current assets | (703) |  |  |  |  |  |  |  | (703) |  |  |
Total current assets | (8,996) |  |  |  |  |  |  |  | (8,996) |  |  |
Deferred income taxes | 587 |  |  |  |  |  |  |  | 587 |  |  |
Contract assets - non-current | (3,316) |  |  |  |  |  |  |  | (3,316) |  |  |
Other assets | (289) |  |  |  |  |  |  |  | (289) |  |  |
Total assets | (12,014) |  |  |  |  |  |  |  | (12,014) |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | 3,019 |  |  |  |  |  |  |  | 3,019 |  |  |
Short-term income taxes payable | (1,209) |  |  |  |  |  |  |  | (1,209) |  |  |
Other accrued expenses | (116) |  |  |  |  |  |  |  | (116) |  |  |
Total current liabilities | 1,694 |  |  |  |  |  |  |  | 1,694 |  |  |
Deferred revenue - non-current | 3,391 |  |  |  |  |  |  |  | 3,391 |  |  |
Deferred income taxes | (424) |  |  |  |  |  |  |  | (424) |  |  |
Total liabilities | 4,661 |  |  |  |  |  |  |  | 4,661 |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |
Accumulated income | (16,675) |  |  |  |  |  |  |  | (16,675) |  |  |
Total stockholders' equity | (16,675) |  |  |  |  |  |  |  | (16,675) |  |  |
Total liabilities and stockholders' equity | (12,014) |  |  |  |  |  |  |  | (12,014) |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (3,407) |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |
Total cost of goods sold |  |  |  |  |  |  |  |  | 605 |  |  |
Gross profit |  |  |  |  |  |  |  |  | (4,012) |  |  |
Operating costs |  |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | 1,108 |  |  |
Total operating costs |  |  |  |  |  |  |  |  | 1,108 |  |  |
Operating income |  |  |  |  |  |  |  |  | (5,120) |  |  |
Income (loss) before taxes |  |  |  |  |  |  |  |  | (5,120) |  |  |
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (365) |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (4,755) |  |  |
ASU 2014-09 | Balances without the adoption of Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net of allowance | 59,300 |  |  |  |  |  |  |  | 59,300 |  |  |
Other current assets | 5,002 |  |  |  |  |  |  |  | 5,002 |  |  |
Total current assets | 182,960 |  |  |  |  |  |  |  | 182,960 |  |  |
Deferred income taxes | 6,188 |  |  |  |  |  |  |  | 6,188 |  |  |
Other assets | 8,111 |  |  |  |  |  |  |  | 8,111 |  |  |
Total assets | 340,812 |  |  |  |  |  |  |  | 340,812 |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | 36,652 |  |  |  |  |  |  |  | 36,652 |  |  |
Short-term income taxes payable | 5,696 |  |  |  |  |  |  |  | 5,696 |  |  |
Other accrued expenses | 9,207 |  |  |  |  |  |  |  | 9,207 |  |  |
Total current liabilities | 74,051 |  |  |  |  |  |  |  | 74,051 |  |  |
Deferred revenue - non-current | 14,063 |  |  |  |  |  |  |  | 14,063 |  |  |
Deferred income taxes | 2,237 |  |  |  |  |  |  |  | 2,237 |  |  |
Total liabilities | 105,046 |  |  |  |  |  |  |  | 105,046 |  |  |
Stockholders' equity |  |  |  |  |  |  |  |  |  |  |  |
Accumulated income | 155,703 |  |  |  |  |  |  |  | 155,703 |  |  |
Total stockholders' equity | 235,766 |  |  |  |  |  |  |  | 235,766 |  |  |
Total liabilities and stockholders' equity | $ 340,812 |  |  |  |  |  |  |  | 340,812 |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 208,873 |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |
Total cost of goods sold |  |  |  |  |  |  |  |  | 65,418 |  |  |
Gross profit |  |  |  |  |  |  |  |  | 143,455 |  |  |
Operating costs |  |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | 64,913 |  |  |
Total operating costs |  |  |  |  |  |  |  |  | 148,551 |  |  |
Operating income |  |  |  |  |  |  |  |  | (5,096) |  |  |
Income (loss) before taxes |  |  |  |  |  |  |  |  | (1,567) |  |  |
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (658) |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ (909) |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.02) |  |  |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.02) |  |  |
ASU 2014-09 | Product and license | Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | $ 2,365 |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |
Total cost of goods sold |  |  |  |  |  |  |  |  | 605 |  |  |
ASU 2014-09 | Product and license | Balances without the adoption of Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 155,342 |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |
Total cost of goods sold |  |  |  |  |  |  |  |  | 51,311 |  |  |
ASU 2014-09 | Service and other | Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (5,772) |  |  |
ASU 2014-09 | Service and other | Balances without the adoption of Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 53,531 |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |
Total cost of goods sold |  |  |  |  |  |  |  |  | $ 14,107 |  |  |

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