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Stock-based Compensation - Restricted Stock and Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2014
Changes in unvested restricted stock |  |  |  |  |  |
Unvested restricted common stock, beginning of period (in shares) |  |  | 513,225 |  |  |
Vested (in shares) |  |  | (225,225) |  |  |
Unvested restricted common stock, end of period(in shares) | 288,000 |  | 288,000 |  | 513,225 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Balance, beginning of period |  |  | $ 18.70 |  |  |
Vested (in dollars per share) |  |  | 6.75 |  |  |
Balance, ending of period | $ 28.05 |  | $ 28.05 |  | $ 18.70 |
Changes in unvested stock options |  |  |  |  |  |
Compensation expense | $ 6,699 | $ 4,468 | $ 20,251 | $ 15,287 |  |
Options exercised prior to vesting (in shares) |  |  |  |  |  | 75,304
Options exercised prior to vesting , exercise price per share |  |  |  |  |  | $ 0.03
Outstanding, beginning of period (in shares) |  |  | 4,372,136 |  |  |
Granted (in shares) |  |  | 1,643,185 |  |  |
Exercised (in shares) |  |  | (634,331) |  |  |
Cancelled (in shares) |  |  | (558,504) |  |  |
Outstanding, end of period (in shares) | 4,822,486 |  | 4,822,486 |  | 4,372,136 |
Exercisable (in shares) | 1,881,620 |  | 1,881,620 |  |  |
Outstanding, beginning of period (in dollars per share) |  |  | $ 17.28 |  |  |
Granted (in dollars per share) |  |  | 36.29 |  |  |
Exercised (in dollars per share) |  |  | 13.73 |  |  |
Cancelled (in dollars per share) |  |  | 24.88 |  |  |
Outstanding, end of period (in dollars per share) | $ 23.38 |  | 23.38 |  | $ 17.28 |
Exercisable (in dollar per share) | $ 17.65 |  | $ 17.65 |  |  |
Remaining contractual life |  |  | 8 years 2 months 12 days |  | 8 years 6 months |
Exercisable, remaining contractual life |  |  | 7 years 6 months |  |  |
Aggregate intrinsic value | $ 48,750 |  | $ 48,750 |  | $ 60,591 |
Exercisable, aggregated intrinsic value | $ 28,201 |  | $ 28,201 |  |  |
Unvested stock options (in shares) | 0 |  | 0 |  | 4,572 |
Employees and directors |  |  |  |  |  |
Changes in unvested stock options |  |  |  |  |  |
Compensation expense |  |  | $ 14,900 | $ 9,100 |  |
Unrecognized stock-based compensation expense | $ 51,800 |  | $ 51,800 |  |  |
Weighted average fair value of options granted (per share) |  |  | $ 25.65 | $ 16.71 |  |
Restricted Stock | Employees |  |  |  |  |  |
Changes in unvested stock options |  |  |  |  |  |
Compensation expense |  |  | $ 0 |  |  |
Unrecognized stock-based compensation expense | 0 |  | 0 |  |  |
Restricted Stock | Non-employees |  |  |  |  |  |
Changes in unvested stock options |  |  |  |  |  |
Compensation expense |  |  | 1,900 |  |  |
Unrecognized stock-based compensation expense | $ 9,000 |  | $ 9,000 |  |  |

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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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