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Summary of Significant Accounting Policies - Recent Accounting Guidance (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
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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, 2019 | Dec. 31, 2015
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 442,575 | $ 410,561 | $ 266,980 |  |
Gross profit | $ 43,567 | $ 39,913 | $ 49,000 | $ 47,156 | $ 36,720 | $ 39,751 | $ 39,062 | $ 34,714 | 179,636 | 150,247 | 99,598 |  |
Income from operations |  |  |  |  |  |  |  |  | 59,959 | 47,842 | 16,623 |  |
Income before income taxes |  |  |  |  |  |  |  |  | 54,705 | 43,831 | 11,024 |  |
Income tax provision |  |  |  |  |  |  |  |  | 8,820 | (83,128) | 23 |  |
Net income | $ 8,463 | $ 8,838 | $ 14,669 | $ 13,915 | $ 91,680 | $ 11,841 | $ 13,932 | $ 9,506 | $ 45,885 | $ 126,959 | $ 11,001 |  |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.26 | $ 0.27 | $ 0.46 | $ 0.43 | $ 2.88 | $ 0.38 | $ 0.46 | $ 0.32 | $ 1.42 | $ 4.11 | $ 0.38 |  |
Diluted (in dollars per share) | $ 0.25 | $ 0.26 | $ 0.43 | $ 0.41 | $ 2.68 | $ 0.35 | $ 0.42 | $ 0.29 | $ 1.35 | $ 3.80 | $ 0.36 |  |
Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | $ 71,939 |  |  |  | $ 83,148 |  |  |  | $ 71,939 | $ 83,148 |  |  |
Total assets | 548,441 |  |  |  | 488,218 |  |  |  | 548,441 | 488,218 |  |  |
Deferred revenue | 22,584 |  |  |  | 18,145 |  |  |  | 22,584 | 18,145 |  |  |
Total current liabilities | 84,997 |  |  |  | 79,287 |  |  |  | 84,997 | 79,287 |  |  |
Total liabilities | 140,104 |  |  |  | 134,608 |  |  |  | 140,104 | 134,608 |  |  |
Accumulated deficit | (157,260) |  |  |  | (204,745) |  |  |  | (157,260) | (204,745) |  |  |
Total stockholders' equity | 408,337 |  |  |  | 353,610 |  |  |  | 408,337 | 353,610 | $ 201,455 |  | $ 183,764
Total liabilities and stockholders' equity | 548,441 |  |  |  | $ 488,218 |  |  |  | 548,441 | 488,218 |  |  |
Cumulative adjustment increase in retained earnings | 1,600 |  |  |  |  |  |  |  | 1,600 |  |  |  |
Product |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 415,922 |  |  |  |
ASU 2018-11 | Total Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |
Operating leases |  |  |  |  |  |  |  |  |  |  |  | $ 6,100 |
ASC 606 Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (1,023) |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | (1,023) |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | (1,023) |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | (1,023) |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | (165) |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ (858) |  |  |  |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.03) |  |  |  |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.03) |  |  |  |
Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 165 |  |  |  |  |  |  |  | $ 165 |  |  |  |
Total assets | 165 |  |  |  |  |  |  |  | 165 |  |  |  |
Deferred revenue | 2,623 |  |  |  |  |  |  |  | 2,623 |  |  |  |
Total current liabilities | 2,623 |  |  |  |  |  |  |  | 2,623 |  |  |  |
Total liabilities | 2,623 |  |  |  |  |  |  |  | 2,623 |  |  |  |
Accumulated deficit | (2,458) |  |  |  |  |  |  |  | (2,458) |  |  |  |
Total stockholders' equity | (2,458) |  |  |  |  |  |  |  | (2,458) |  |  |  |
Total liabilities and stockholders' equity | 165 |  |  |  |  |  |  |  | 165 |  |  |  |
ASC 606 Adjustments | Product |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (1,023) |  |  |  |
ASC 606 Adjustments | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Reclassification Decrease In Contract With Customer Liability Due To New ASU Adoption | 1,600 |  |  |  |  |  |  |  | 1,600 |  |  |  |
Cumulative adjustment increase in retained earnings | 1,600 |  |  |  |  |  |  |  | 1,600 |  |  |  |
Pro Forma Under ASC 605 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 441,552 | $ 410,561 | $ 266,980 |  |
Gross profit |  |  |  |  |  |  |  |  | 178,613 |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 58,936 |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 53,682 |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | 8,655 |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 45,027 |  |  |  |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.39 |  |  |  |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.32 |  |  |  |
Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 72,104 |  |  |  |  |  |  |  | $ 72,104 |  |  |  |
Total assets | 548,606 |  |  |  |  |  |  |  | 548,606 |  |  |  |
Deferred revenue | 25,207 |  |  |  |  |  |  |  | 25,207 |  |  |  |
Total current liabilities | 87,620 |  |  |  |  |  |  |  | 87,620 |  |  |  |
Total liabilities | 142,727 |  |  |  |  |  |  |  | 142,727 |  |  |  |
Accumulated deficit | (159,718) |  |  |  |  |  |  |  | (159,718) |  |  |  |
Total stockholders' equity | 405,879 |  |  |  |  |  |  |  | 405,879 |  |  |  |
Total liabilities and stockholders' equity | $ 548,606 |  |  |  |  |  |  |  | 548,606 |  |  |  |
Pro Forma Under ASC 605 | Product |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 414,899 |  |  |  |

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