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Stockholder's Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 10, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 09, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Increase in shares reserved for issuance (in shares) | 1,800,000 |  |  |  |  |
Shares reserved for issuance (in shares) | 4,800,000 |  |  |  |  | 3,000,000
Share-based payment |  | $ 912 | $ 1,112 | $ 2,459 | $ 3,019 |
Stock options issued ESPP (in shares) |  | 0 | 22,000 | 20,000 | 45,000 |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based payment |  | $ 899 | $ 1,093 | $ 2,430 | $ 2,970 |
Unrecognized compensation expense |  | $ 3,864 |  | $ 3,864 |  |
Weighted-average period of recognition |  |  |  | 2 years 10 months 2 days |  |
Stock options exercised (in shares) |  | 0 |  | 6,000 |  |
Stock options granted (in shares) |  | 654,000 |  | 654,000 |  |
Stock options expired (in shares) |  | 18,000 |  | 124,000 |  |
Stock options exercised, delivered to company |  |  |  | $ 51 |  |
Stock options outstanding (in shares) |  | 2,148,000 |  | 2,148,000 |  |
Stock options outstanding, weighted average exercise price (in USD per share) |  | $ 9.20 |  | $ 9.20 |  |
Stock options exercisable (in shares) |  | 692,000 |  | 692,000 |  |
Exercisable stock options, weighted average exercise price (in USD per share) |  | $ 9.51 |  | $ 9.51 |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense |  | $ 4,418 |  | $ 4,418 |  |
Weighted-average period of recognition |  |  |  | 2 years 8 months 15 days |  |
Restricted stock (in shares) |  | 297,000 |  | 317,000 |  |
Restricted stock, weighted average price (in USD per share) |  | $ 8.13 |  | $ 8.19 |  |
Restricted stock award, forfeitures, less than (in shares) |  | 7,000 |  | 7,000 |  |
Restricted stock vested (in shares) |  | 14,000 |  | 235,000 |  |
Restricted stock surrendered (in shares) |  | 0 |  | 0 |  |
Restricted stock outstanding (in shares) |  | 573,000 |  | 573,000 |  |
Unvested outstanding options (in shares) |  | 0 |  | 0 |  |
Performance-Based or Market-Based Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unvested outstanding options (in shares) |  | 0 |  | 0 |  |
Employee Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based payment |  | $ 13 | $ 19 | $ 29 | $ 49 |
ESPP Plan | Employee Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of Company's common stock share price |  | 85.00% |  | 85.00% |  |

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- Definition For presentations that combine terminations, the number of shares under options that were 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 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)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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