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Share-Based Compensation (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) offeringPeriod $ / shares shares | Jun. 30, 2020 USD ($) shares
Share-based Compensation expenses [Abstract] |  |  |  |
Share-based compensation expenses | $ | $ 1,721 | $ 1,765 | $ 3,228 | $ 3,625
Employee Stock Purchase Plan [Abstract] |  |  |  |
Shares issued under employee stock purchase plan (in shares) | shares |  |  | 19,270 | 14,961
ESPP discount | $ |  |  | $ 11 | $ 11
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation expenses [Abstract] |  |  |  |
Share-based compensation expenses | $ | 11 | 11 | 11 | 11
Restricted stock units |  |  |  |
Share-based Compensation expenses [Abstract] |  |  |  |
Share-based compensation expenses | $ | $ 43 | 309 | $ 81 | 773
Number of Units |  |  |  |
Unvested, at beginning of period (in shares) | shares |  |  | 14,000 |
Granted (in shares) | shares |  |  | 0 |
Vested (in shares) | shares |  |  | (4,000) |
Forfeited (in shares) | shares |  |  | (2,000) |
Unvested, at end of period (in shares) | shares | 8,000 |  | 8,000 |
Weighted Average Grant Date Fair Value |  |  |  |
Unvested, at beginning of period (in dollars per share) |  |  | $ 11.38 |
Granted (in dollars per share) |  |  | 0 |
Vested (in dollars per share) |  |  | 7.54 |
Forfeited (in dollars per share) |  |  | 13.00 |
Unvested, at end of period (in dollars per share) | $ 13.00 |  | $ 13.00 |
Grant date fair value of shares vested during the period | $ | $ 30 |  | $ 30 |
Unrecognized compensation costs of RSU awards | $ | 1 |  | 1 |
Stock options |  |  |  |
Share-based Compensation expenses [Abstract] |  |  |  |
Share-based compensation expenses | $ | $ 1,667 | 1,445 | $ 3,136 | 2,841
Number of Options |  |  |  |
Outstanding at beginning of period (in shares) | shares |  |  | 3,259,000 |
Granted (in shares) | shares |  |  | 1,211,000 |
Exercised, Forfeited, Expired (in shares) | shares |  |  | (39,000) |
Outstanding at end of period (in shares) | shares | 4,431,000 |  | 4,431,000 |
Vested or expected to vest at end of period (in shares) | shares | 4,246,000 |  | 4,246,000 |
Exercisable at end of period (in shares) | shares | 1,824,000 |  | 1,824,000 |
Weighted Average Exercise Price |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  | $ 8.14 |
Granted (in dollars per share) |  |  | 4.73 |
Exercised, Forfeited, Expired (in dollars per share) |  |  | 5.63 |
Outstanding at end of period (In dollars per share) | $ 7.23 |  | 7.23 |
Vested or expected to vest at end of period (in dollars per share) | 7.34 |  | 7.34 |
Exercisable at end of period (in dollars per share) | 9.92 |  | $ 9.92 |
Fair Value Assumptions [Abstract] |  |  |  |
Expected dividend yield |  |  | 0.00% |
Expected term (years) |  |  | 6 years 1 month 6 days |
Risk-free interest rate |  |  | 1.00% |
Weighted average grant date fair value (in dollars per share) |  |  | $ 3.61 |
Additional Disclosures [Abstract] |  |  |  |
Share price (in dollars per share) | $ 3.97 |  | $ 3.97 |
Intrinsic value of options granted | $ |  |  | $ 1 |
Compensation Cost Not yet Recognized [Abstract] |  |  |  |
Unrecognized compensation expense related to non-vested stock options | $ | $ 6,653 |  | $ 6,653 |
Unrecognized compensation cost, recognition period |  |  | 1 year 10 months 24 days |
Stock options | Minimum |  |  |  |
Fair Value Assumptions [Abstract] |  |  |  |
Expected volatility |  |  | 95.00% |
Additional Disclosures [Abstract] |  |  |  |
Share price (in dollars per share) | $ 3.76 |  | $ 3.76 |
Stock options | Maximum |  |  |  |
Fair Value Assumptions [Abstract] |  |  |  |
Expected volatility |  |  | 100.00% |
Additional Disclosures [Abstract] |  |  |  |
Share price (in dollars per share) | $ 5.30 |  | $ 5.30 |
Employee Stock |  |  |  |
Employee Stock Purchase Plan [Abstract] |  |  |  |
Number of offering periods | offeringPeriod |  |  | 2 |
Offering period |  |  | 6 months |
Purchase price of common stock as percentage of fair market value |  |  | 85.00% |
Manufacture and supply |  |  |  |
Share-based Compensation expenses [Abstract] |  |  |  |
Share-based compensation expenses | $ | $ 71 | 72 | $ 153 | 135
Research and development |  |  |  |
Share-based Compensation expenses [Abstract] |  |  |  |
Share-based compensation expenses | $ | 208 | 183 | 440 | 365
Selling, general and administrative |  |  |  |
Share-based Compensation expenses [Abstract] |  |  |  |
Share-based compensation expenses | $ | $ 1,442 | $ 1,510 | $ 2,635 | $ 3,125

X
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- Definition For presentations that combine terminations, the number of shares under options that were exercised, cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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