Shareholder Equity - Summary of Stock Option Activity (Details) - $ / shares	1 Months Ended	6 Months Ended
Dec. 31, 2018	Sep. 30, 2016	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)			3,941,947
Granted (in shares)	425,000	650,000	2,425,115
Exercised (in shares)			(30,000)
Cancelled or forfeited (in shares)			(558,018)
Outstanding at end of period (in shares)	3,941,947		5,779,044
Exercisable at end of period (in shares)			1,189,418
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (in USD per share)			$ 2.12
Granted (in USD per share)			0.93
Exercised (in USD per share)			1.50
Cancelled or forfeited (in USD per share)			2.30
Outstanding at end of period (in USD per share)	$ 2.12		1.60
Exercisable at end of period (in USD per share)			$ 2.86

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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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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