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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 63 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020
Stock-Based Compensation |  |  |  |
Shares issued under the Employee Stock Purchase Plan (in shares) |  | $ 224 | $ 218 |
Employee stock |  |  |  |
Stock-Based Compensation |  |  |  |
Common stock available for issuance (in shares) |  | 1,000,000 |  | 1,000,000
Common stock granted since inception (in shares) |  |  |  | 628,770
Employee stock | Subsequent event |  |  |  |
Stock-Based Compensation |  |  |  |
Shares purchased during period (in shares) | 32,971 |  |  |
Shares issued under the Employee Stock Purchase Plan (in shares) | $ 200 |  |  |
Service-based stock options |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration period |  | 10 years |  |
Vesting period |  | 4 years |  |
Granted (in shares) |  | 1,186,140 |  |
Weighted average grant-date fair value (in dollars per share) |  | $ 8.64 | $ 12.82 |
Service-based stock options | Nonemployee directors |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration period |  | 10 years |  |
Vesting period |  | 1 year |  |
Restricted Stock Units (RSUs) |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period |  | 4 years |  |
Restricted stock units granted (shares) |  | 186,136 | 176,422 |
Weighted-average grant date fair value (in usd per share) |  | $ 11.24 | $ 17.77 |
Grant-date fair value of restricted stock units granted |  | $ 2,100 | $ 3,100 |
Shares vested in period (shares) |  | 36,212 |  |
Restricted stock withheld for employee tax remittance (in shares) |  | 13,872 |  |
Restricted Stock Units (RSUs) | Nonemployee directors |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period |  | 1 year |  |
Prior Plans |  |  |  |
Stock-Based Compensation |  |  |  |
Awards available for future grant under the Plan (in shares) |  | 0 |  | 0
Omnibus Incentive Plan 2019 |  |  |  |
Stock-Based Compensation |  |  |  |
Awards available for future grant under the Plan (in shares) |  | 1,959,142 |  | 1,959,142

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- Definition 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. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Net number of non-option equity instruments granted to participants. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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