Stock Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Options Outstanding
Balance as of beginning of period (in shares)	7,207,733
Granted (in shares)	749,111
Exercised (in shares)	(142,729)
Forfeited and canceled (in shares)	(344,855)
Balance as of end of period (in shares)	7,469,260
Weighted- Average Exercise Price
Balance as of beginning of period (in usd per share)	$ 1.94
Granted (in usd per share)	1.17
Exercised (in usd per share)	1.08
Forfeited and canceled (in usd per share)	2.02
Balance as of end of period (in usd per share)	$ 1.87
Aggregate Intrinsic Value (in thousands)
Aggregate Intrinsic Value	$ 0	$ 412

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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