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Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 55,403 | $ 50,081 | $ 47,727 | $ 47,014 | $ 44,207 | $ 40,982 | $ 38,886 | $ 38,015 | $ 200,225 | $ 162,090 | $ 128,868
Cost of revenue | 22,363 | 20,497 | 20,273 | 19,971 | 15,770 | 17,790 | 16,764 | 16,610 | 83,104 | 66,934 | 59,495
Gross profit | 33,040 | 29,584 | 27,454 | 27,043 | 28,437 | 23,192 | 22,122 | 21,405 | 117,121 | 95,156 | 69,373
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Research and development | 6,748 | 6,689 | 6,836 | 6,847 | 6,236 | 6,041 | 5,799 | 5,802 | 27,120 | 23,878 | 22,659
Sales and marketing | 17,358 | 16,502 | 16,932 | 15,778 | 14,480 | 12,925 | 12,637 | 12,706 | 66,570 | 52,748 | 42,042
General and administrative | 8,767 | 4,679 | 6,845 | 8,860 | 6,511 | 6,143 | 5,882 | 6,536 | 29,151 | 25,072 | 25,822
Total operating expenses | 32,873 | 27,870 | 30,613 | 31,485 | 27,227 | 25,109 | 24,318 | 25,044 | 122,841 | 101,698 | 90,523
Loss from operations | 167 | 1,714 | (3,159) | (4,442) | 1,210 | (1,917) | (2,196) | (3,639) | (5,720) | (6,542) | (21,150)
Other income (expense), net: |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt | 0 | 0 | 0 | 0 | 0 | (1,026) | 0 | 0 | 0 | (1,026) | 0
Interest expense | (836) | (865) | (888) | (882) | (869) | (961) | (1,197) | (1,199) | (3,471) | (4,226) | (4,727)
Interest income and other | 164 | 118 | 90 | 118 | 54 | 12 | (33) | (45) | 490 | (12) | 100
Total other income (expense), net | (672) | (747) | (798) | (764) | (815) | (1,975) | (1,230) | (1,244) | (2,981) | (5,264) | (4,627)
Income (loss) before income taxes | (505) | 967 | (3,957) | (5,206) | 395 | (3,892) | (3,426) | (4,883) | (8,701) | (11,806) | (25,777)
Provision for (benefit from) income taxes | 126 | 43 | 50 | 49 | (14) | (2) | 42 | 28 | 268 | 54 | 61
Net loss | $ (631) | $ 924 | $ (4,007) | $ (5,255) | $ 409 | $ (3,890) | $ (3,468) | $ (4,911) | $ (8,969) | $ (11,860) | $ (25,838)
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per share, basic (in USD per share) | $ (0.01) | $ 0.02 | $ (0.07) | $ (0.10) | $ 0.01 | $ (0.07) | $ (0.07) | $ (0.10) |  |  |
Net income (loss) per share, diluted (in USD per share) | $ (0.01) | $ 0.02 | $ (0.07) | $ (0.10) | $ 0.01 | $ (0.07) | $ (0.07) | $ (0.10) |  |  |
Shares used in computing net loss per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 56,034 | 55,310 | 54,723 | 53,688 | 53,126 | 52,708 | 52,143 | 51,377 |  |  |
Diluted (in shares) | 56,034 | 59,441 | 54,723 | 53,688 | 56,633 | 52,708 | 52,143 | 51,377 |  |  |

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