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Stock Options - Summary of Activity for Options and Restricted Stock Units (RSUs) Outstanding (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options, Outstanding ‑ December 31, 2019 | shares	1,916
Stock Options, Granted | shares	829
Stock Options, Forfeited/canceled | shares	(40)
Stock Options, Exercised | shares	(35)
Stock Options, Outstanding ‑ September 30, 2020 | shares	2,670
Weighted Average Exercise Price, Outstanding ‑ December 31, 2019 | $ / shares	$ 1.73
Weighted Average Exercise Price, Granted | $ / shares	2.67
Weighted Average Exercise Price, Forfeited/canceled | $ / shares	0.83
Weighted Average Exercise Price, Exercised | $ / shares	0.53
Weighted Average Exercise Price, Outstanding ‑ September 30, 2020 | $ / shares	$ 2.05
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs, Outstanding ‑ December 31, 2019 | shares	26
RSUs, Granted | shares	53
RSUs, Outstanding ‑ September 30, 2020 | shares	79
Weighted Average Grant Date Value Per Share, Outstanding ‑ December 31, 2019 | $ / shares	$ 0.78
Weighted Average Grant Date Value Per Share, Granted | $ / shares	0.78
Weighted Average Grant Date Value Per Share, Outstanding ‑ September 30, 2020 | $ / shares	$ 0.78

X

- 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).

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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).

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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.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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