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Stockholders' Equity - Summary of Restricted Stock Activity (Details) | 6 Months Ended
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Jun. 30, 2018 $ / shares shares
Time based restricted stock units |
Class Of Stock [Line Items] |
Unvested restricted stock units/ awards outstanding, Beginning balance | 42,028
Granted | 28,273
Vested | (2,295)
Forfeited/canceled | (1,452)
Unvested restricted stock units/ awards outstanding, Ending balance | 66,554
Performance and time based restricted stock units |
Class Of Stock [Line Items] |
Unvested restricted stock units/ awards outstanding, Beginning balance | 13,109
Vested | (4,370)
Unvested restricted stock units/ awards outstanding, Ending balance | 8,739
Restricted stock units |
Class Of Stock [Line Items] |
Unvested restricted stock units/ awards outstanding, Beginning balance | 55,137
Granted | 28,273
Vested | (6,665)
Forfeited/canceled | (1,452)
Unvested restricted stock units/ awards outstanding, Ending balance | 75,293
Unvested and expected to vest restricted stock units/awards outstanding | 69,947
Weighted-average grant date fair value per share, Unvested restricted stock units/ awards outstanding, Beginning balance | $ / shares | $ 90.05
Weighted-average grant date fair value per share, Granted | $ / shares | 137.92
Weighted-average grant date fair value per share, Vested | $ / shares | 86.70
Weighted-average grant date fair value per share, Forfeited/canceled | $ / shares | 104.81
Weighted-average grant date fair value per share, Unvested restricted stock units/ awards outstanding, Ending balance | $ / shares | 108.04
Weighted-average grant date fair value per share, Unvested and expected to vest restricted stock units/awards outstanding | $ / shares | $ 108.69
Time based restricted stock awards |
Class Of Stock [Line Items] |
Unvested restricted stock units/ awards outstanding, Beginning balance | 20,789
Granted | 21,222
Unvested restricted stock units/ awards outstanding, Ending balance | 42,011
Performance and time based restricted stock awards |
Class Of Stock [Line Items] |
Unvested restricted stock units/ awards outstanding, Beginning balance | 20,785
Granted | 31,830
Vested | (6,928)
Unvested restricted stock units/ awards outstanding, Ending balance | 45,687
Restricted stock awards |
Class Of Stock [Line Items] |
Unvested restricted stock units/ awards outstanding, Beginning balance | 41,574
Granted | 53,052
Vested | (6,928)
Unvested restricted stock units/ awards outstanding, Ending balance | 87,698
Unvested and expected to vest restricted stock units/awards outstanding | 69,176
Weighted-average grant date fair value per share, Unvested restricted stock units/ awards outstanding, Beginning balance | $ / shares | $ 91.52
Weighted-average grant date fair value per share, Granted | $ / shares | 122.00
Weighted-average grant date fair value per share, Vested | $ / shares | 91.52
Weighted-average grant date fair value per share, Unvested restricted stock units/ awards outstanding, Ending balance | $ / shares | 108.30
Weighted-average grant date fair value per share, Unvested and expected to vest restricted stock units/awards outstanding | $ / shares | $ 108.43

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options unvested and expected to vest, outstanding, number. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options unvested and expected to vest weighted average grant date fair value. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 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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