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Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Installment $ / shares shares | Jun. 30, 2019 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation expenses | $ 646 | $ 1,022 | $ 1,842 | $ 1,523
Weighted-average grant-date fair value of stock options granted | $ / shares |  |  | $ 1.52 |
Intrinsic value of stock options exercised |  |  | $ 200 |
Stock Options Outstanding |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation expenses | 300 | 700 | 800 | 1,000
Unrecognized compensation cost related to non-vested stock options | 2,800 |  | $ 2,800 |
Non-vested awards not yet recognized weighted-average period for recognition |  |  | 2 years 7 months 6 days |
Restricted Stock Awards and Restricted Stock Units |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation expenses | 400 | $ 300 | $ 1,000 | $ 500
Non-vested awards not yet recognized weighted-average period for recognition |  |  | 2 years 3 months 18 days |
Unrecognized compensation cost related to non-vested restricted stock | $ 4,800 |  | $ 4,800 |
Fair value of restricted stock vested |  |  | $ 200 |
2018 Equity Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Annual percentage increase in number of shares authorized for issuance |  |  | 4.00% |
Vesting terms of stock options |  |  | stock options vest 25% upon the first anniversary of the date of grant and the remainder ratably monthly thereafter for 36 months. Restricted stock awards and restricted stock units vest ratably in three equal installments on the first, second and third anniversaries of the grant date. |
Number of vesting installments | Installment |  |  | 3 |
Shares available for future issuance | shares | 1,300,000 |  | 1,300,000 |
2018 Equity Incentive Plan | First Anniversary of Date of Grant |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting percentage of stock options |  |  | 25.00% |
2018 Equity Incentive Plan | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares authorized for issuance | shares | 1,400,000 |  | 1,400,000 |
Maximum contractual term of stock options |  |  | 10 years |

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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=120381028&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=120381028&loc=d3e5070-113901 + Details
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