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Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Additional General Disclosures [Abstract] |  |  |  |
Stock-based compensation expense |  | $ 323 | $ 19 |
Compensation Cost Not yet Recognized [Abstract] |  |  |  |
Unrecognized compensation expense |  | $ 2,189 |  |
Weighted average period of recognition |  | 1 year 1 month 28 days |  |
Stock Options [Member] |  |  |  |
Number of Stock Options [Abstract] |  |  |  |
Options outstanding (in shares) |  | 4,271,515 |  |
Weighted average exercise price, outstanding (in dollars per share) |  | $ 2.02 |  |
Vested (in shares) |  | 1,009,097 |  |
Exercisable (in shares) |  | 1,009,097 |  |
Exercised (in shares) |  | (71,250) |  |
Weighted average exercise price, exercised (in dollars per share) |  | $ 1.83 |  |
Issuance of common stock (in shares) |  | 28,824 |  |
Number of shares available for issuance (in shares) |  | 1,142,210 |  |
Restricted Stock Units [Member] | New Members of the Board of Directors [Member] |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Granted (in shares) |  |  |  | 140,097
Fair market value (in dollars per share) |  |  |  | $ 2.07
Restricted stock cancelled (in shares) | (19,324) |  |  |
Term of vesting |  | 12 months |  |
Aggregate grant date fair value |  | $ 290 |  |

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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 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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