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Revenue - Impacts on financial statements (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Pro forma Balance Sheet: |  |  |  |  |  |
Accounts receivable, net of allowance | $ 41,704 |  | $ 41,704 |  |  | $ 48,126
Contract asset | 4,915 |  | 4,915 |  |  |
Other current assets | 7,978 |  | 7,978 |  |  | 5,501
Total current assets | 176,812 |  | 176,812 |  |  | 227,937
Deferred income taxes | 4,922 |  | 4,922 |  |  | 5,460
Contract assets - non-current | 7,534 |  | 7,534 |  |  |
Other assets | 6,649 |  | 6,649 |  |  | 5,229
Total assets | 347,092 |  | 347,092 |  |  | 337,622
Deferred revenue | 30,675 |  | 30,675 |  |  | 33,295
Short-term income taxes payable | 1,599 |  | 1,599 |  |  | 3,673
Other accrued expenses | 10,680 |  | 10,680 |  |  | 7,746
Total current liabilities | 60,894 |  | 60,894 |  |  | 66,153
Deferred revenue - non-current | 6,947 |  | 6,947 |  |  | 7,019
Deferred income taxes | 9,131 |  | 9,131 |  |  | 7,753
Total liabilities | 96,176 |  | 96,176 |  |  | 99,692
Accumulated income | 169,317 |  | 169,317 |  |  | 156,151
Total stockholders' equity | 250,916 |  | 250,916 |  |  | 237,930
Total liabilities and stockholders' equity | 347,092 |  | 347,092 |  |  | $ 337,622
Pro format Income Statement: |  |  |  |  |  |
Revenue | 49,554 | $ 45,694 | 94,986 | $ 87,658 |  |
Cost of goods sold | 13,573 | 13,646 | 24,308 | 25,698 |  |
Gross profit | 35,981 | 32,048 | 70,678 | 61,960 |  |
Sales and marketing | 16,622 | 15,339 | 30,899 | 29,043 |  |
Total operating costs | 38,592 | 32,448 | 71,641 | 62,059 |  |
Operating loss | (2,611) | (400) | (963) | (99) |  |
Income before taxes | (872) | 313 | 1,549 | 1,119 |  |
Provision for income taxes | 130 | 203 | 759 | 436 |  |
Net income (loss) | $ (1,002) | $ 110 | $ 790 | $ 683 |  |
Basic (in dollars per share) | $ (0.03) | $ 0.00 | $ 0.02 | $ 0.02 |  |
Diluted (in dollars per share) | $ (0.03) | $ 0.00 | $ 0.02 | $ 0.02 |  |
Product and license |  |  |  |  |  |
Pro format Income Statement: |  |  |  |  |  |
Revenue | $ 34,986 | $ 34,472 | $ 68,480 | $ 66,032 |  |
Cost of goods sold | 10,391 | 11,045 | 18,576 | 20,585 |  |
Service and other |  |  |  |  |  |
Pro format Income Statement: |  |  |  |  |  |
Revenue | 14,568 | 11,222 | 26,506 | 21,626 |  |
Cost of goods sold | 3,182 | $ 2,601 | 5,732 | $ 5,113 |  |
ASU 2014-09 |  |  |  |  |  |
Pro forma Balance Sheet: |  |  |  |  |  |
Accumulated income |  |  |  |  | $ 11,900 |
ASU 2014-09 | Adjustments |  |  |  |  |  |
Pro forma Balance Sheet: |  |  |  |  |  |
Accounts receivable, net of allowance | (266) |  | (266) |  |  |
Contract asset | (4,915) |  | (4,915) |  |  |
Other current assets | (59) |  | (59) |  |  |
Total current assets | (5,240) |  | (5,240) |  |  |
Deferred income taxes | 507 |  | 507 |  |  |
Contract assets - non-current | (7,534) |  | (7,534) |  |  |
Other assets | (150) |  | (150) |  |  |
Total assets | (12,417) |  | (12,417) |  |  |
Deferred revenue | 2,820 |  | 2,820 |  |  |
Short-term income taxes payable | (2,689) |  | (2,689) |  |  |
Other accrued expenses | (116) |  | (116) |  |  |
Total current liabilities | 15 |  | 15 |  |  |
Deferred revenue - non-current | 1,751 |  | 1,751 |  |  |
Deferred income taxes | (424) |  | (424) |  |  |
Total liabilities | 1,342 |  | 1,342 |  |  |
Accumulated income | (13,759) |  | (13,759) |  |  |
Total stockholders' equity | (13,759) |  | (13,759) |  |  |
Total liabilities and stockholders' equity | (12,417) |  | (12,417) |  |  |
Pro format Income Statement: |  |  |  |  |  |
Revenue | 679 |  | (2,466) |  |  |
Cost of goods sold | 141 |  | 534 |  |  |
Gross profit | 538 |  | (3,000) |  |  |
Sales and marketing | 225 |  | 607 |  |  |
Total operating costs | 225 |  | 607 |  |  |
Operating loss | 313 |  | (3,607) |  |  |
Income before taxes | 313 |  | (3,607) |  |  |
Provision for income taxes | (748) |  | (1,767) |  |  |
Net income (loss) | 1,061 |  | (1,840) |  |  |
ASU 2014-09 | Balances without the adoption of Topic 606 |  |  |  |  |  |
Pro forma Balance Sheet: |  |  |  |  |  |
Accounts receivable, net of allowance | 41,438 |  | 41,438 |  |  |
Other current assets | 7,919 |  | 7,919 |  |  |
Total current assets | 171,572 |  | 171,572 |  |  |
Deferred income taxes | 5,429 |  | 5,429 |  |  |
Other assets | 6,499 |  | 6,499 |  |  |
Total assets | 334,675 |  | 334,675 |  |  |
Deferred revenue | 33,495 |  | 33,495 |  |  |
Short-term income taxes payable | (1,090) |  | (1,090) |  |  |
Other accrued expenses | 10,564 |  | 10,564 |  |  |
Total current liabilities | 60,909 |  | 60,909 |  |  |
Deferred revenue - non-current | 8,698 |  | 8,698 |  |  |
Deferred income taxes | 8,707 |  | 8,707 |  |  |
Total liabilities | 97,518 |  | 97,518 |  |  |
Accumulated income | 155,558 |  | 155,558 |  |  |
Total stockholders' equity | 237,157 |  | 237,157 |  |  |
Total liabilities and stockholders' equity | 334,675 |  | 334,675 |  |  |
Pro format Income Statement: |  |  |  |  |  |
Revenue | 50,233 |  | 92,520 |  |  |
Cost of goods sold | 13,714 |  | 24,842 |  |  |
Gross profit | 36,519 |  | 67,678 |  |  |
Sales and marketing | 16,847 |  | 31,506 |  |  |
Total operating costs | 38,817 |  | 72,248 |  |  |
Operating loss | (2,298) |  | (4,570) |  |  |
Income before taxes | (559) |  | (2,058) |  |  |
Provision for income taxes | (618) |  | (1,008) |  |  |
Net income (loss) | $ 59 |  | $ (1,050) |  |  |
Basic (in dollars per share) | $ 0.00 |  | $ (0.03) |  |  |
Diluted (in dollars per share) | $ 0.00 |  | $ (0.03) |  |  |
ASU 2014-09 | Product and license | Adjustments |  |  |  |  |  |
Pro format Income Statement: |  |  |  |  |  |
Revenue | $ 2,372 |  | $ (75) |  |  |
Cost of goods sold | 141 |  | 534 |  |  |
ASU 2014-09 | Product and license | Balances without the adoption of Topic 606 |  |  |  |  |  |
Pro format Income Statement: |  |  |  |  |  |
Revenue | 37,358 |  | 68,405 |  |  |
Cost of goods sold | 10,532 |  | 19,110 |  |  |
ASU 2014-09 | Service and other | Adjustments |  |  |  |  |  |
Pro format Income Statement: |  |  |  |  |  |
Revenue | (1,693) |  | (2,391) |  |  |
ASU 2014-09 | Service and other | Balances without the adoption of Topic 606 |  |  |  |  |  |
Pro format Income Statement: |  |  |  |  |  |
Revenue | 12,875 |  | 24,115 |  |  |
Cost of goods sold | $ 3,182 |  | $ 5,732 |  |  |

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