Discount rate for common stock purchase.

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Aggregate number of common shares reserved for future issuance.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date the equity-based award expires, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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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.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	12 Months Ended
	Sep. 25, 2018	Jun. 04, 2018	May 17, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 08, 2018	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation					$ 23,543	$ 14,728
Weighted Average Remaining Life (in years)					1 year 7 months 6 days
IPO [Member] \| PWERM [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average expected rate of return						80.00%
Discount for lack of marketability						10.00%
IPO [Member] \| OPM [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average expected rate of return						20.00%
Discount for lack of marketability						15.00%
2018 Stock Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance	1,632,134	3,300,000			953,275
Maximum annual increase of outstanding stock reserved for future issuance, Percentage	5.00%
2018 Employee Stock Purchase Plan (ESPP) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum annual increase of outstanding stock reserved for future issuance, Percentage					1.25%
Number of shares available for grant under the plan					446,160
Common stock discount rate					85.00%
Shares issued under employee stock purchase plan, Shares					9,207
Shares issued under employee stock purchase plan, Value					$ 37,000
2014 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance									1,000,000
2014 Stock Option Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option plan expiration period			10 years
2003 Plan and 2014 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Time based awards vesting period					4 years
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation					$ 1,600	$ 600
Unrecognized compensation expense for stock options issued					$ 4,800
Weighted Average Remaining Life (in years)					8 years 1 month 2 days	9 years 5 months 4 days
Weighted-average fair value of stock options granted						$ 12.70
Stock Options [Member] \| 2018 Stock Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Authorized replacement equity awards of stock options and restricted stock units		1,901,900
Share-based compensation arrangement by share-based payment award, Award vesting rights		generally vest 33% on the first anniversary of the grant date with the balance vesting monthly over the remaining two years
Share based compensation awards expiration date				Jan. 31, 2020
Stock Options [Member] \| 2018 Stock Compensation Plan [Member] \| First Anniversary [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted under the 2018 Plan vesting percentage		33.00%		25.00%
Stock Options [Member] \| 2018 Stock Compensation Plan [Member] \| Second Anniversary [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted under the 2018 Plan vesting percentage				25.00%
Stock Options [Member] \| 2018 Stock Compensation Plan [Member] \| Third Anniversary [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted under the 2018 Plan vesting percentage				25.00%
Stock Options [Member] \| 2018 Stock Compensation Plan [Member] \| Forth Anniversary [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted under the 2018 Plan vesting percentage				25.00%
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense for stock options issued					$ 1,000
Weighted-average recognized period					1 year 8 months 12 days
Restricted Stock Units (RSUs) [Member] \| 2018 Stock Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Authorized replacement equity awards of stock options and restricted stock units								1,340,832
Unrecognized compensation cost of replacement awards		$ 17,200
Communicated Option Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted Average Remaining Life (in years)						0 years	4 years 10 months 9 days
Weighted-average fair value of stock options granted						$ 12.91