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Stock-Based Compensation - Summary of Stock Option Activity (Details) - Options Issued and Outstanding - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Outstanding, beginning, Shares Available for Grant | 1,350,582 |
Shares reserved for issuance, Shares Available for Grant | 1,122,213 |
Options granted, Shares Available for Grant | (604,440) |
Options cancelled, Shares Available for Grant | 20,800 |
Outstanding, ending, Shares Available for Grant | 1,889,155 | 1,350,582
Outstanding, beginning, Number of Options | 1,122,677 |
Options granted, Number of Options | 604,440 |
Options cancelled, Number of Options | (20,800) |
Outstanding, ending, Number of Options | 1,706,317 | 1,122,677
Exercisable, Number of Options | 194,221 |
Vested and expected to vest, Number of Options | 1,706,317 |
Outstanding, beginning, Weighted-Average Exercise Price per Option | $ 11.63 |
Options granted, Weighted-Average Exercise Price per Option | 8.58 |
Options cancelled, Weighted-Average Exercise Price per Option | 9.91 |
Outstanding, ending, Weighted-Average Exercise Price per Option | 10.57 | $ 11.63
Exercisable, Weighted-Average Exercise Price per Option | 11.62 |
Vested and expected to vest, Weighted-Average Exercise Price per Option | $ 10.57 |
Outstanding, beginning, Weighted-Average Remaining Contract Term | 9 years 3 months 18 days | 9 years 2 months 19 days
Exercisable, Weighted-Average Remaining Contract Term | 8 years 8 months 12 days |
Vested and expected to vest, Weighted-Average Remaining Contract Term | 9 years 3 months 18 days |
Outstanding, ending, Aggregate Intrinsic Value | $ 627 |
Exercisable, Aggregate Intrinsic Value | 202 |
Vested and expected to vest, Aggregate Intrinsic Value | $ 627 |

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- Definition Share based compensation arrangement by share based payment award number of shares available for grant shares granted, shares reserved for issuance. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + 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 The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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 Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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